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Lakeshore 332 User Manual

Manual is about: Temperature Controller

Summary of 332

  • Page 1

    User’s manual model 332 temperature controller control a control b tune ramp remote alarm control setup setpoint zone setting pid/ mhp input setup curve entry math alarm analog output remote/ local interface escape enter auto tune loop heater range heater off 332 temperature controller lakeshore 1 2...

  • Page 2

    Lake shore model 332 temperature controller user’s manual a limited warranty statement warranty period: one (1) year 1. Lake shore warrants that this lake shore product (the “product”) will be free from defects in materials and workmanship for the warranty period specified above (the “warranty perio...

  • Page 3: Declaration of Conformity

    Lake shore model 332 temperature controller user’s manual declaration of conformity we: lake shore cryotronics, inc. 575 mccorkle blvd. Westerville oh 43082-8888 usa hereby declare that the equipment specified conforms to the following directives and standards: application of council directives: ......

  • Page 4

    Lake shore model 332 temperature controller user’s manual c electromagnetic compatibility (emc) for the model 332 temperature controller electromagnetic compatibility (emc) of electronic equipment is a growing concern worldwide. Emissions of and immunity to electromagnetic interference is now part o...

  • Page 5: Table of Contents

    Lake shore model 332 temperature controller user’s manual table of contents chapter/paragraph title page 1 introduction .................................................................................................................................................... 1-1 1.0 general ..................

  • Page 6

    Lake shore model 332 temperature controller user’s manual table of contents (continued) chapter/paragraph title page 3 installation ...................................................................................................................................................... 3-1 3.0 general ....

  • Page 7

    Lake shore model 332 temperature controller user’s manual table of contents (continued) chapter/paragraph title page 4.5.1 diode sensor curve selection ..................................................................................................... 4-13 4.5.2 resistor sensor curve selection ......

  • Page 8

    Lake shore model 332 temperature controller user’s manual table of contents (continued) chapter/paragraph title page 6.1.2 ieee-488 command structure ....................................................................................................... 6-2 6.1.2.1 bus control commands ................

  • Page 9: List of Illustrations

    Lake shore model 332 temperature controller user’s manual table of contents (continued) chapter/paragraph title page 8.10.2.2 10 µa current source calibration and 1 µa, 100 µa, 1 ma output verfication ........................ 8-12 8.10.2.3 diode input ranges calibration ................................

  • Page 10: List of Tables

    Lake shore model 332 temperature controller user’s manual vi table of contents list of tables table no. Title page 1-1 temperature range of typical lake shore sensors .................................................................................... 1-4 1-2 model 332 sensor input performance chart...

  • Page 11: Chapter 1

    Lake shore model 332 temperature controller user’s manual chapter 1 introduction 1.0 general this chapter introduces the model 332 temperature controller. The model 332 was designed and manufactured in the united states of america by lake shore cryotronics, inc. The model 332 temperature controller ...

  • Page 12

    Lake shore model 332 temperature controller user’s manual 1.1 product description the lake shore model 332 temperature controller creates a new standard for high-resolution temperature measurement in an easy-to-use temperature controller. The model 332 offers high resolution with negative temperatur...

  • Page 13

    Lake shore model 332 temperature controller user’s manual product definition (continued) loop 1 heater output is a well-regulated variable dc current source. Heater output is optically isolated from other circuits to reduce interference and ground loops. Heater output can provide up to 50 w of conti...

  • Page 14

    Lake shore model 332 temperature controller user’s manual 1.2 sensor selection guide the lake shore temperature measurement and control catalog contains complete information on selecting the appropriate lake shore temperature sensor for your application. A list of sensors that may be used with the m...

  • Page 15

    Lake shore model 332 temperature controller user’s manual sensor selection guide (continued) rox™ rtd thick film sensors are useful in low temperature applications in magnetic fields, with a very low incidence of magnetic field errors. Each model adheres to a single resistance versus temperature cur...

  • Page 16

    Lake shore model 332 temperature controller user’s manual table 1-2. Model 332 typical sensor performance chart (continued) sensor type germanium gr-200a-1500 germanium gr-200a-250 cernox™ cx-1070 cernox™ cx-1050 cernox™ cx-1030 temperature coefficient negative negative negative negative negative in...

  • Page 17

    Lake shore model 332 temperature controller user’s manual table 1-2. Model 332 typical sensor performance chart (continued) sensor type thermocouple 25 mv thermocouple 50 mv temperature coefficient positive positive input range ±25 mv ±50 mv sensor excitation * (constant current) not applicable not ...

  • Page 18

    Lake shore model 332 temperature controller user’s manual 1.3 specifications table 1-3. Model 332 input specifications input type input range excitation resolution electronic accuracy temperature coefficient display resolution ntc-rtd * 0 – 75 Ω 1 ma 0.3 m Ω +0.000% of reading ±0.001 Ω ±0.04% of rea...

  • Page 19

    Lake shore model 332 temperature controller user’s manual specifications (continued) control control loops: 2 control type: closed loop digital pid with manual heater power output, or open loop tuning: autotune (one loop at a time), manual pid, zones control stability: sensor dependent, refer to per...

  • Page 20

    Lake shore model 332 temperature controller user’s manual specifications (continued) interface ieee-488.2 interface features: sh1,ah1,t5,l4,sr1,rl1,pp0,dc1,dt0,c0,e1 reading rate: to 10 readings per second on each input software support: labview driver serial interface electrical format: rs-232c max...

  • Page 21

    Lake shore model 332 temperature controller user’s manual specifications (continued) accessories included part number description 106-009 heater output connector (dual banana jack) g-106-233 sensor input mating connector (6-pin din plugs); 2 included 106-234 terminal block, 8-pin man-332 user manual...

  • Page 22

    Lake shore model 332 temperature controller user’s manual safety summary (continued) ventilation the instrument has ventilation holes in its side covers. Do not block these holes when the instrument is operating. Do not operate in an explosive atmosphere do not operate the instrument in the presence...

  • Page 23: Chapter 2

    Lake shore model 332 temperature controller user’s manual chapter 2 cooling system design 2.0 general selecting the proper cryostat or cooling source is probably the most important decision in designing a temperature control system. The cooling source defines minimum temperature, cool-down time, and...

  • Page 24

    Lake shore model 332 temperature controller user’s manual 2.1.3 environmental conditions the experimental environment is also important when choosing a sensor. Environmental factors such as high vacuum, magnetic field, corrosive chemicals, or even radiation can limit the use of some types of sensors...

  • Page 25

    Lake shore model 332 temperature controller user’s manual traditional calibration (continued) calibrated sensors include the measured test data printed and plotted, the coefficients of a chebychev polynomial that has been fitted to the data, and two tables of data points to be used as interpolation ...

  • Page 26

    Lake shore model 332 temperature controller user’s manual band 2 k* - 100 k 100 k - 305 k 305 k - 375 k 11 ±0.25 k ±0.5 k ±1.0 k 11a ±0.25 k ±1% of temp. 12 ±0.5 k ±1.0 k ±2.0 k 12a ±0.5 k ±1% of temp. 13 ±1 k ±1% of temp. Lake shore silicon diode temperature sensor standard softcal™ calibration pre...

  • Page 27

    Lake shore model 332 temperature controller user’s manual 2.3 sensor installation this section highlights some of the important elements of proper sensor installation. Lake shore sensors are shipped with installation instructions that cover that specific sensor type and package. The lake shore tempe...

  • Page 28

    Lake shore model 332 temperature controller user’s manual 2.3.5 contact pressure when sensors are permanently mounted, the solder or epoxy used to hold the sensor act as both gasket and adhesive. Permanent mounting is not a good solution for everyone because it limits flexibility and can potentially...

  • Page 29

    Lake shore model 332 temperature controller user’s manual 2.3.7 lead soldering when additional wire is soldered to short sensor leads, care must be taken not to overheat the sensor. A heat sink such as a metal wire clamp or alligator clip will heat sink the leads and protect the sensor. Leads should...

  • Page 30

    Lake shore model 332 temperature controller user’s manual 2.4.2 heater location for best temperature measurement accuracy the heater should be located so that heat flow between the cooling power and heater is minimized. For best control the heater should be in close thermal contact with the cooling ...

  • Page 31

    Lake shore model 332 temperature controller user’s manual 2.5.3 two-sensor approach there is a conflict between the best sensor location for measurement accuracy and the best sensor location for control. For measurement accuracy the sensor should be very near the sample being measured which is away ...

  • Page 32

    Lake shore model 332 temperature controller user’s manual 2.6.1 proportional (p) the proportional term, also called gain, must have a value greater than zero for the control loop to operate. The value of the proportional term is multiplied by the error (e) which is defined as the difference between ...

  • Page 33

    Lake shore model 332 temperature controller user’s manual p-331-2-3.Bmp figure 2-3. Examples of pid control cooling system design 2-11.

  • Page 34

    Lake shore model 332 temperature controller user’s manual 2.7 manual tuning there has been a lot written about tuning closed-loop control systems and specifically pid control loops. This section does not attempt to compete with control theory experts. It describes a few basic rules of thumb to help ...

  • Page 35

    Lake shore model 332 temperature controller user’s manual tuning proportional (continued) if the load does not oscillate in a controlled manner, the heater range could be set too low. A constant heater reading of 100% on the display would be an indication of a low range setting. The heater range cou...

  • Page 36

    Lake shore model 332 temperature controller user’s manual 2-14 cooling system design autotuning (continued) when the user selects a new setpoint, the model 332 logs the change in temperature at the load and the change in heater output that was required to make the load temperature change. The old co...

  • Page 37: Chapter 3

    Lake shore model 332 temperature controller user’s manual chapter 3 installation 3.0 general this chapter provides general installation instructions for the model 332 temperature controller. Inspection and unpacking instructions are provided in paragraph 3.1. Repackaging for shipment instructions ar...

  • Page 38

    Lake shore model 332 temperature controller user’s manual 3.3 rear panel definition this paragraph provides a description of the model 332 rear panel connections. The rear panel consists of the line input assembly, rs-232 connector, heater output connector, input a and b sensor input connectors, the...

  • Page 39

    Lake shore model 332 temperature controller user’s manual 3.4 line input assembly this section describes how to properly connect the model 332 to line power. Please follow these instructions carefully to ensure proper operation of the instrument and the safety of operators. 120 100/120/220/240 v –10...

  • Page 40

    Lake shore model 332 temperature controller user’s manual 3.4.4 power switch the power switch is part of the line input assembly on the rear panel of the model 332 and turns line power to the instrument on and off. When the circle is depressed, power is off. When the line is depressed, power is on. ...

  • Page 41

    Lake shore model 332 temperature controller user’s manual sensor lead cable (continued) of the instrument. This type of cable is available through local electronics suppliers. Instrument specifications are given assuming 10 feet of sensor cable. Longer cables, 100 feet or more, can be used but envir...

  • Page 42

    Lake shore model 332 temperature controller user’s manual 3.5.6 two-lead sensor measurement there are times when crowding in a cryogenic system forces users to read sensors in a two lead configuration because there are not enough feedthroughs or room for lead wires. If this is the case, plus voltage...

  • Page 43

    Lake shore model 332 temperature controller user’s manual 3.6 thermocouple sensor inputs (model 332-tx only) the information in this paragraph is for a model 332 configured at the factory with one or two thermocouple sensor inputs; being model 332-t1 or t2. Sensor connection is important when using ...

  • Page 44

    Lake shore model 332 temperature controller user’s manual 3.7 heater output setup the following paragraphs cover the heater wiring from the vacuum shroud to the instrument for both control loop outputs. Specifications are detailed in paragraph 1.3. For help on choosing and installing an appropriate ...

  • Page 45

    Lake shore model 332 temperature controller user’s manual 3.7.4 loop 1 heater output noise the heater output circuitry in the model 332 must be capable of sourcing 50 w of power. This type of circuitry can generate some electrical noise. The model 332 was designed to generate as little noise as poss...

  • Page 46

    Lake shore model 332 temperature controller user’s manual 3.8 analog output when control loop 2 is not being used, its output can be configured as an analog voltage output. When properly configured the model 332 has a single analog output on pins 7 and 8 of the terminal block at the rear of the inst...

  • Page 47

    Lake shore model 332 temperature controller user’s manual relays (continued) relay connections are available in positions 1 thru 6 of the detachable relay and analog output terminal block. See figure 3-5. The terminal block (p/n 106-737) is included with the model 332. For convenient installation of...

  • Page 48

    Lake shore model 332 temperature controller user’s manual 3-12 installation initial setup and system checkout procedure (continued) note: for rated accuracy, the instrument should warm up for at least 30 minutes. 10. The default input settings are “silicon diodes” on inputs a and b, with input a con...

  • Page 49: Chapter 4

    Lake shore model 332 temperature controller user’s manual chapter 4 operation 4.0 general this chapter describes model 332 temperature controller operation. A definition of front panel controls is provided in paragraph 4.1. Turning power on is described in paragraph 4.2. Paragraphs 4.3 thru 4.20 des...

  • Page 50

    Lake shore model 332 temperature controller user’s manual keypad definitions (continued) control setup allows selection of control input, setpoint units, closed or open-loop control mode, power up enable, display of heater output units, setpoint ramp enable, and ramp rate for the currently selected ...

  • Page 51

    Lake shore model 332 temperature controller user’s manual 4.1.2 annunciators led annunciators six blue led annunciators are included to provide visual feedback of the following operation. Control a on when input a is being used as the control input for the loop being displayed. Refer to paragraph 4....

  • Page 52

    Lake shore model 332 temperature controller user’s manual 4.1.4 display definition in normal operation, the 2 row by 20 character vacuum fluorescent display is divided into four user- configurable areas that can provide temperature readings, setpoint display, and heater status. Other information is ...

  • Page 53

    Lake shore model 332 temperature controller user’s manual 4.2 turning power on after verifying line voltage (paragraph 3.4), plug the instrument end of the line cord (included with the connector kit) into the power and fuse assembly receptacle on the instrument rear. Plug the opposite end of the lin...

  • Page 54

    Lake shore model 332 temperature controller user’s manual display format (continued) use the s or t key to cycle between input a, input b, or none. For this example, select input a then press the enter key. You will see the following display select for disp 1 °® source temp k use the s or t key to c...

  • Page 55

    Lake shore model 332 temperature controller user’s manual 4.4 input setup the model 332 supports a variety of temperature sensors sold by lake shore and other manufacturers. An appropriate sensor type must be selected for each of the two inputs. If the exact sensor model is not shown, use the sensor...

  • Page 56

    Lake shore model 332 temperature controller user’s manual diode sensor input setup (continued) use the s or t key to cycle through the sensor types shown in table 4-1, until “diode” is displayed. Press the enter key. Select for inputa °® diode silicon use the s or t key to cycle through the sensor t...

  • Page 57

    Lake shore model 332 temperature controller user’s manual ntc rtd sensor input setup (continued) select for inputa °® type ntc rtd use the s or t key to cycle through the sensor types shown in table 4-1, until “ntc rtd” is displayed. Press the enter key. Select for inputa °® ntc rtd 75mv 75 Ω use th...

  • Page 58

    Lake shore model 332 temperature controller user’s manual 4.4.4 thermocouple sensor input setup the following thermocouple screens are only displayed when the model 332 hardware is configured at the factory with one or two thermocouple sensor inputs; being model 332 – t1 or t2. The user has the choi...

  • Page 59

    Lake shore model 332 temperature controller user’s manual 4.4.4.2 room-temperature calibration procedure room-temperature calibration is used to calibrate the built-in compensation and is recommended when a thermocouple is first installed or any time a thermocouple is changed. Factory calibration of...

  • Page 60

    Lake shore model 332 temperature controller user’s manual 4.5 curve selection the model 332 supports a variety of temperature sensors sold by lake shore and other manufacturers. After the appropriate sensor type is selected for each of the two inputs (paragraph 4.4), an appropriate curve may be sele...

  • Page 61

    Lake shore model 332 temperature controller user’s manual 4.5.1 diode sensor curve selection once the input is setup for the silicon or gallium-aluminum-arsenide diode (paragraph 4.4.1), you may choose a temperature curve. Standard curve numbers 1 thru 4 being relevant choices. You are also given th...

  • Page 62

    Lake shore model 332 temperature controller user’s manual 4.6 temperature control there are many steps involved in setting up a temperature control loop. Chapter 2 of this manual describes the principals of closed loop (feedback) control. Chapter 3 describes necessary hardware installation. The foll...

  • Page 63

    Lake shore model 332 temperature controller user’s manual 4.6.2 control modes the model 332 offers two control modes: closed loop and open loop. To select a control mode refer to paragraph 4.7. Closed-loop control: closed-loop control, often called feedback control, is the control mode most often as...

  • Page 64

    Lake shore model 332 temperature controller user’s manual control setup (continued) the control setpoint can be displayed and set in temperature or sensor units. Changing setpoint units does not change operation of the controller, only the way the setpoint is displayed and entered. A valid curve mus...

  • Page 65

    Lake shore model 332 temperature controller user’s manual 4.8 manual tuning (closed-loop pid control) in manual pid mode, the controller will accept user-entered proportional, integral, and derivative parameters to provide three-term pid control. Manual heater power output can be set manually in ope...

  • Page 66

    Lake shore model 332 temperature controller user’s manual 4.8.3 manually setting derivative (d) the derivative parameter (sometimes called rate) is the d part of the pid control equation. The rate time constant should normally be somewhere between 1/4 and 1/8 the integral time in seconds, if used at...

  • Page 67

    Lake shore model 332 temperature controller user’s manual 4.9 autotune (closed-loop pid control) the model 332 automates the tuning process of typical cryogenic systems with the autotune feature. For additional information about the algorithm refer to paragraph 2.8. Before initiating autotune the co...

  • Page 68

    Lake shore model 332 temperature controller user’s manual 4.10 zone settings (closed-loop control mode) the model 332 allows the user to establish up to 10 custom contiguous temperature zones where the controller will automatically use pre-programmed pid values and heater ranges. Zone control can be...

  • Page 69

    Lake shore model 332 temperature controller user’s manual zone settings (continued) enter for zone 01 integ (i) 20.0 the integral (i) value is entered using the numeric keypad, which includes the numbers 0 – 9, +/–, and decimal point. Integral has a range of 0.1 to 1000 with a default of 20. Press t...

  • Page 70: Zone Setting Worksheet

    Lake shore model 332 temperature controller user’s manual zone 01 0 k zone 02 zone 03 zone 04 zone 05 zone 06 zone 07 zone 08 zone 09 zone 10 setpoint: setpoint: setpoint: setpoint: setpoint: setpoint: setpoint: setpoint: setpoint: setpoint: 0 k heater range off low med high proportional (0.1-1000) ...

  • Page 71

    Lake shore model 332 temperature controller user’s manual 4.11 setpoint the control setpoint is the desired load temperature expressed in temperature or sensor units. Use sensor units if no temperature response curve is selected for the sensor input used as the control channel. The control setpoint ...

  • Page 72

    Lake shore model 332 temperature controller user’s manual ramp (continued) note : when an incomplete ramp is shut off, the setpoint will remain on the most current setting, i.E., the reading will not jump to the end of the ramp. Note : if the input type or input curve is changed while a ramp is in p...

  • Page 73

    Lake shore model 332 temperature controller user’s manual heater range and heater off (continued) loop 1 full scale heater power at typical resistance heater resistance heater range heater power 10 Ω low med high 100 mw 1 w 10 w 25 Ω low med high 250 mw 2.5 w 25 w 50 Ω low med high 500 mw 5 w 50 w n...

  • Page 74

    Lake shore model 332 temperature controller user’s manual 4.14 math three math features are included for convenience and aid in setting up experiments. Max and min readings can be captured. A linear equation can be applied to input data to correct system errors or improve performance of the analog o...

  • Page 75

    Lake shore model 332 temperature controller user’s manual 4.14.2 linear the model 332 will process either of two simple linear equations for each sensor input: mx+b or m(x+b). The result can be displayed or directed to the analog voltage output. There are two different equations available. In each: ...

  • Page 76

    Lake shore model 332 temperature controller user’s manual linear (continued) use the s or t key to toggle between the linear b variable: +sp1, –sp1, +sp2, –sp2, value. Press the enter key to accept the new setting. You will see the next display. Enter for math a lin equ b +0.0000 the linear variable...

  • Page 77

    Lake shore model 332 temperature controller user’s manual 4.15 alarms and relays 4.15.1 alarms each input of the model 332 has high and low alarm capability for each input. Input reading data from any source can be compared to the alarm setpoint values. A reading higher than the high setpoint trigge...

  • Page 78

    Lake shore model 332 temperature controller user’s manual alarms (continued) select for alm a °® alarm on use the s or t key to toggle between alarm on or off. Press the enter key. Select for alm a °® source temp k use the s or t key to cycle through the following data sources: temp c, temp k, linea...

  • Page 79

    Lake shore model 332 temperature controller user’s manual 4.15.2 relays there are two relays on the model 332 numbered 1 and 2. They are most commonly thought of as alarm relays, but may be manually controlled also. Relay assignments are configurable as shown in figure 4-7.Two relays can be used wit...

  • Page 80

    Lake shore model 332 temperature controller user’s manual 4.16 analog output when control loop 2 is not being used, its output can be configured as an analog voltage output. When properly configured the model 332 has a single analog output on pins 7 and 8 of the terminal block at the rear of the ins...

  • Page 81

    Lake shore model 332 temperature controller user’s manual analog output in input mode (continued) bipolar mode refers to whether or not negative voltages are used, as shown below. Bipolar mode: on bipolar mode: on bipolar mode: off bipolar mode: off –10 v +10 v 0 v lowest middle highest input output...

  • Page 82

    Lake shore model 332 temperature controller user’s manual 4.16.2 analog output in manual mode in manual mode, the analog output provide a fixed output according to a percentage of full scale entered by the user; -100.00% to +100.00% corresponding to –10 v to +10 v. The setting resolution on the disp...

  • Page 83

    Lake shore model 332 temperature controller user’s manual 4.16.3 analog output in loop 2 mode in loop 2 mode, the analog output is directly controlled by model 332. To place the analog output in loop 2 mode, press the analog output key, then press the s or t key until you see the following display. ...

  • Page 84

    Lake shore model 332 temperature controller user’s manual 4.18 display brightness the user is able to control the brightness of the vacuum fluorescent display. Press and hold the display format key for several seconds until you see the following display. Select with °® brightness 75% use the s or t ...

  • Page 85

    Lake shore model 332 temperature controller user’s manual interface (continued) select with °® emulation mode 332 use the s or t key to toggle between 332 and 330. The default setting is 332. If 332 mode is selected, pressing the enter key will return you to the normal display. To support owners of ...

  • Page 86

    Lake shore model 332 temperature controller user’s manual 4-38 operation default values (continued) input version 1.0 clear curves no use the s or t key to select yes or no to clear the user curves (in locations 21 – 41) stored in the model 332. Standard curves (in locations 1 – 20) are unaffected. ...

  • Page 87: Chapter 5

    Lake shore model 332 temperature controller user’s manual chapter 5 advanced operation 5.0 general this chapter covers the advanced operation of the model 332 temperature controller. Advanced operation consists of the functions related to temperature response curves. A temperature response curve can...

  • Page 88

    Lake shore model 332 temperature controller user’s manual 5.1.2 curve breakpoints temperature response data of a calibrated sensor must be reduced to a table of breakpoints before entering it into the instrument. Each breakpoint consists of one value in sensor units and one temperature value in kelv...

  • Page 89

    Lake shore model 332 temperature controller user’s manual table 5-1. Curve header parameters name: the curve name cannot be changed from the front panel. Curve names can only be entered over the computer interface (up to 15 characters). The default curve name is user xx, where xx is the curve number...

  • Page 90

    Lake shore model 332 temperature controller user’s manual 5.2.1 edit curve the edit curve operation is used to enter a new curve or edit an existing user curve. Only user curves (21 to 41) can be changed. Standard curves can only be viewed with the edit operation. Entering the identification paramet...

  • Page 91

    Lake shore model 332 temperature controller user’s manual edit curve (continued) now that the curve identification parameters are entered, it is time to enter curve breakpoints. User curve 21 ¾ 0.00000v 00.0000½ the cursor initially blinks on the curve breakpoint number. When the cursor is in this p...

  • Page 92

    Lake shore model 332 temperature controller user’s manual 5.2.2 erase curve user curves that are no longer needed may be erased. Erase curve sets all identification parameters to default and blanks all breakpoint values. To erase an existing user curve, press the curve entry key. Press the s or t ke...

  • Page 93

    Lake shore model 332 temperature controller user’s manual copy curve (continued) once the curve number is selected, press the enter key. You will see the following message. Select copy to °® curve 21 user use the s or t key to select the curve number (21 thru 41) to copy to. Press the enter key to c...

  • Page 94

    Lake shore model 332 temperature controller user’s manual softcal point 1 softcal point 1 liquid helium boiling point 4.2 k softcal point 2 liquid nitrogen boiling point 77.35 k softcal point 1 room temperature point 305 k 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 2 10 k 50 100 k 200 32...

  • Page 95

    Lake shore model 332 temperature controller user’s manual 5.3.3 softcal with platinum sensors the platinum sensor is a well-accepted temperature standard because of its consistent and repeatable temperature response above 30 k. Softcal gives platinum sensors better accuracy than their nominal matchi...

  • Page 96

    Lake shore model 332 temperature controller user’s manual 5.3.5 softcal calibration curve creation once the calibration data points have been obtained, you may create a softcal calibration. This example illustrates softcal of a dt-470 diode. Press the curve entry key. Press the s or t key until you ...

  • Page 97

    Lake shore model 332 temperature controller user’s manual softcal calibration curve creation (continued) note: if point 2 is not being used, press the enter key with both settings at their default value and advance to point 3. Use the numerical keypad to enter the measured data point at or near the ...

  • Page 98

    Lake shore model 332 temperature controller user’s manual 5-12 advanced operation this page intentionally left blank.

  • Page 99: Chapter 6

    Lake shore model 332 temperature controller user’s manual chapter 6 computer interface operation 6.0 general this chapter provides operational instructions for the computer interface for the lake shore model 332 temperature controller. Either of the two computer interfaces provided with the model 33...

  • Page 100

    Lake shore model 332 temperature controller user’s manual 6.1.1 changing ieee-488 interface parameters two interface parameters, address and terminators, must be set from the front panel before communication with the instrument can be established. Other interface parameters can be set with device sp...

  • Page 101

    Lake shore model 332 temperature controller user’s manual bus control commands (continued) finally, addressed bus control commands are multiline commands that must include the model 332 listen address before the instrument responds. Only the addressed device responds to these commands. The model 332...

  • Page 102

    Lake shore model 332 temperature controller user’s manual 6.1.3 status registers there are two status registers: the status byte register described in paragraph 6.1.3.1, and the standard event status register in paragraph 6.1.3.2. 6.1.3.1 status byte register and service request enable register the ...

  • Page 103

    Lake shore model 332 temperature controller user’s manual standard event status register and standard event status enable register (continued) the standard event status enable query, qese?, reads the standard event status enable register. Qesr? Reads the standard event status register. Once this reg...

  • Page 104

    Lake shore model 332 temperature controller user’s manual figure 6-1. Gpib setting configuration figure 6-2. Dev 12 device template configuration 6-6 remote operation.

  • Page 105

    Lake shore model 332 temperature controller user’s manual 6.1.4.2 visual basic ieee-488 interface program setup this ieee-488 interface program works with visual basic 6.0 (vb6) on an ibm pc (or compatible) with a pentium-class processor. A pentium 90 or higher is recommended, running windows 95 or ...

  • Page 106

    Lake shore model 332 temperature controller user’s manual table 6-1. Ieee-488 interface program control properties current name property new value label1 name caption lblexitprogram type “exit” to end program. Label2 name caption lblcommand command label3 name caption lblresponse response text1 name...

  • Page 107

    Lake shore model 332 temperature controller user’s manual table 6-2. Visual basic ieee-488 interface program public gsend as boolean 'global used for send button state private sub cmdsend_click() 'routine to handle send button press gsend = true 'set flag to true end sub private sub form_load() 'mai...

  • Page 108

    Lake shore model 332 temperature controller user’s manual 6.1.4.3 ieee-488 interface board installation for quick basic program this procedure works on an ibm pc (or compatible) running dos or in a dos window. This example uses the national instruments gpib-pcii/iia card. 1. Install gpib-pcii/iia ca...

  • Page 109

    Lake shore model 332 temperature controller user’s manual primary gpib address ........ Primary gpib address ........ à à00 secondary gpib address ...... None secondary gpib address ...... None timeout setting ............. 10sec timeout setting ............. 10sec terminate read on eos ....... Yes ...

  • Page 110

    Lake shore model 332 temperature controller user’s manual table 6-3. Quick basic ieee-488 interface program ' ieeeexam.Bas example program for ieee-488 interface ' ' this program works with quickbasic 4.0/4.5 on an ibm pc or compatible. ' ' the example requires a properly configured national instrum...

  • Page 111

    Lake shore model 332 temperature controller user’s manual 6.1.4.5 program operation once either example program is running, try the following commands and observe the response of the instrument. Input from the user is shown in bold and terminators are added by the program. The word [term] indicates ...

  • Page 112

    Lake shore model 332 temperature controller user’s manual 6.2 serial interface overview the serial interface used in the model 332 is commonly referred to as an rs-232c interface. Rs-232c is a standard of the electronics industries association (eia) that describes one of the most common interfaces b...

  • Page 113

    Lake shore model 332 temperature controller user’s manual 6.2.3 character format a character is the smallest piece of information that can be transmitted by the interface. Each character is 10 bits long and contains data bits, bits for character timing and an error detection bit. The instrument uses...

  • Page 114

    Lake shore model 332 temperature controller user’s manual 6.2.5 message flow control it is important to remember that the user program is in charge of the serial communication at all times. The instrument can not initiate communication, determine which device should be transmitting at a given time o...

  • Page 115

    Lake shore model 332 temperature controller user’s manual 6.2.7 serial interface example programs two basic programs are included to illustrate the serial communication functions of the instrument. The first program was written in visual basic. Refer to paragraph 6.2.7.1 for instructions on how to s...

  • Page 116

    Lake shore model 332 temperature controller user’s manual table 6-5. Serial interface program control properties current name property new value label1 name caption lblexitprogram type “exit” to end program. Label2 name caption lblcommand command label3 name caption lblresponse response text1 name t...

  • Page 117

    Lake shore model 332 temperature controller user’s manual table 6-6. Visual basic serial interface program public gsend as boolean 'global used for send button state private sub cmdsend_click() 'routine to handle send button press gsend = true 'set flag to true end sub private sub form_load() 'main ...

  • Page 118

    Lake shore model 332 temperature controller user’s manual 6.2.7.2 quick basic serial interface program setup the serial interface program listed in table 6-7 works with quickbasic 4.0/4.5 or qbasic on an ibm pc (or compatible) running dos or in a dos window with a serial interface. It uses the com1 ...

  • Page 119

    Lake shore model 332 temperature controller user’s manual 6.2.7.3 program operation once either example program is running, try the following commands and observe the response of the instrument. Input from the user is shown in bold and terminators are added by the program. The word [term] indicates ...

  • Page 120

    Lake shore model 332 temperature controller user’s manual 6.3 command summary this paragraph provides a listing of the ieee-488 and serial interface commands. A summary of all the commands is provided in table 6-8. All the commands are detailed in paragraph 6.3.1, which is presented in alphabetical ...

  • Page 121

    Lake shore model 332 temperature controller user’s manual table 6-8. Command summary command function page q cls clear interface cmd ............................... 24 q ese event status enable cmd ...................... 24 q ese? Event status enable query .................... 24 q esr? Event status...

  • Page 122

    Lake shore model 332 temperature controller user’s manual 6.3.1 interface commands (alphabetical listing) qcls clear interface command input: qcls[term] remarks: clears the bits in the status byte register and standard event status register and terminates all pending operations. Clears the interface...

  • Page 123

    Lake shore model 332 temperature controller user’s manual q opc operation complete command input: qopc[term] remarks: generates an operation complete event in the event status register upon completion of all pending selected device operations. Send it as the last command in a command string. Q opc? ...

  • Page 124

    Lake shore model 332 temperature controller user’s manual qtst? Self-test query input: qtst?[term] returned: [term] format: n 0 = no errors found, 1 = errors found remarks: the model 332 reports status based on test done at power up. Qwai wait-to-continue command input: qwai[term] remarks: this comm...

  • Page 125

    Lake shore model 332 temperature controller user’s manual almrst reset alarm status command input: almrst[term] remarks: clears both the high and low status of all alarms, including latching alarms. Analog analog output parameter command input: analog , , , , , , [term] format: n,n,a,n,±nnnnnn,±nnnn...

  • Page 126

    Lake shore model 332 temperature controller user’s manual beep alarm beeper command input: beep [term] format: n 0 = off, 1 = on. Remarks: enables or disables system beeper sound when an alarm condition is met. Beep? Alarm beeper query input: beep? Returned: [term] format: n (refer to command for de...

  • Page 127

    Lake shore model 332 temperature controller user’s manual crvdel curve delete command input: crvdel [term] format: nn specifies a user curve to delete. Valid entries: 21 – 41. Example: crvdel 21[term] – deletes user curve 21. Crvhdr curve header command input: crvhdr , , , , , [term] format: nn,aaaa...

  • Page 128

    Lake shore model 332 temperature controller user’s manual crvpt? Curve data point query input: crvpt? , [term] format: nn,nnn specifies which curve to query: 1 – 41. Specifies the points index in the curve: 1 – 200. Returned: , [term] format: ±nnnnnnn,±nnnnnnn (refer to command for description) rema...

  • Page 129

    Lake shore model 332 temperature controller user’s manual dispfld? Displayed field query input: dispfld? [term] format: n specifies field to query: 1 – 4. Returned: , [term] format: n,n (refer to command for description) emul 330 emulation mode command input: emul [term] format: n specifies whether ...

  • Page 130

    Lake shore model 332 temperature controller user’s manual htr? Heater output query input: htr?[term] returned: [term] format: +nnn.N loop 1 heater output in percent (%). Use aout? For loop 2. Htrst? Heater status query input: htrst?[term] returned: [term] format: n heater error code: 0 = no error, 1...

  • Page 131

    Lake shore model 332 temperature controller user’s manual intype input type parameter command input: intype , , [term] format: a,n,n specifies input to configure: a or b. Specifies input sensor type. Valid entries: 0 = silicon diode 8 = ntc rtd 75mv 75 Ω 1 = gaalas diode 9 = ntc rtd 75mv 750 Ω 2 = p...

  • Page 132

    Lake shore model 332 temperature controller user’s manual ldat? Linear equation data query input: ldat? [term] format: a specifies which input to query: a or b. Returned: [term] format: ±nnnnnn remarks: also see the rdgst? Command. Linear input linear equation parameter command input: linear , , , ,...

  • Page 133

    Lake shore model 332 temperature controller user’s manual lock? Front panel keyboard lock query input: lock?[term] returned: , [term] format: n,nnn (refer to command for description) mdat? Minimum/maximum data query input: mdat? [term] format: a specifies which input to query: a or b. Returned: ,[te...

  • Page 134

    Lake shore model 332 temperature controller user’s manual mode? Remote interface mode query input: mode?[term] returned: [term] format: n (refer to command for description) mout control loop manual heater power (mhp) output command input: mout , [term] format: n, ±nnnnnn[term] specifies loop to conf...

  • Page 135

    Lake shore model 332 temperature controller user’s manual ramp control setpoint ramp parameter command input: ramp , , [term] format: n,n,±nnnnn specifies which loop to configure: 1 or 2. Specifies whether ramping is 0 = off or 1 = on. Specifies setpoint ramp rate in kelvin per minute from 0.1 to 10...

  • Page 136

    Lake shore model 332 temperature controller user’s manual rdgst? Input reading status query input: rdgst? [term] format: a specifies which input to query: a or b. Returned: [term] format: nnn remarks: the integer returned represents the sum of the bit weighting of the input status flag bits. A “000”...

  • Page 137

    Lake shore model 332 temperature controller user’s manual scal generate softcal curve command input: scal , , , , , , , , [term] format: n,nn,aaaaaaaaaa,±nnnnnn,±nnnnnn,±nnnnnn,±nnnnnn,±nnnnnn,±nnnnnn specifies the standard curve to generate a softcal from. Valid entries: 1, 6, 7. Specifies the user...

  • Page 138

    Lake shore model 332 temperature controller user’s manual 6-40 remote operation temp? Thermocouple junction temperature query input: temp? Returned: [term] format: ±nnnnnnn remarks: temperature is in kelvin. Tunest? Control tuning status query input: tunest? Returned: [term] format: n 0 = no active ...

  • Page 139: Chapter 7

    Lake shore model 332 temperature controller user’s manual chapter 7 options and accessories 7.0 general this chapter provides model 332 temperature controller options and accessories. Model numbers are detailed in paragraph 7.1, options in paragraph 7.2, accessories in paragraph 7.3, and the model 3...

  • Page 140

    Lake shore model 332 temperature controller user’s manual 7.3 accessories accessories are devices that perform a secondary duty as an aid or refinement to the primary unit. Refer to the lake shore temperature measurement and control catalog for details. A list of accessories available for the model ...

  • Page 141

    Lake shore model 332 temperature controller user’s manual model description of accessories (continued) htr-50 50 Ω cartridge heater. The heater features precision-wound nickel-chromium resistance wire, magnesium oxide insulation, two solid pins, non-magnetic package, and has ul and csa component rec...

  • Page 142

    Lake shore model 332 temperature controller user’s manual 7.4 model 3003 heater output conditioner the lake shore model 3003 heater output conditioner is a passive filter which reduces the already low noise present in the heater output of the model 332. The model 3003 connects between the heater out...

  • Page 143

    Lake shore model 332 temperature controller user’s manual c-331-7-3.Eps figure 7-3. Model rm-1/2 rack-mount kit options and accessories 7-5.

  • Page 144

    Lake shore model 332 temperature controller user’s manual refer to “installation procedure” 1. Use 5/64 inch (2 mm) hex key to remove two 6-32 x 1/4 black button head screws from side of instrument. 2. Place instrument on shelf. 3. Use 5/64 inch (2 mm) hex key to reinstall two 6-32 x 1/4 black butto...

  • Page 145: Chapter 8

    Lake shore model 332 temperature controller user’s manual chapter 8 service 8.0 general this chapter describes the service for the model 332 temperature controller. Paragraph 8.1 provides a description of electrostatic discharge (esd), line voltage selection in paragraph 8.2, fuse replacement in par...

  • Page 146

    Lake shore model 332 temperature controller user’s manual 8.2 line voltage selection use the following procedure to change the instrument line voltage selector. Verify the fuse value whenever line voltage is changed. Warning: to avoid potentially lethal shocks, turn off controller and disconnect it ...

  • Page 147

    Lake shore model 332 temperature controller user’s manual fuse replacement (continued) 5. Remove existing fuses. Replace with proper slow-blow (time-delay) fuse ratings as follows: 100/120 v 1.6 a t 250 v 5 × 20 mm 220/240 v 0.75 a t 250 v 5 × 20 mm 6. Re-assemble line input assembly in reverse orde...

  • Page 148

    Lake shore model 332 temperature controller user’s manual terminal block connector lake shore p/n 106-739 1 2 3 4 5 6 7 8 use screwdriver to lock or unlock wires insert wire into slot slides into slot at rear of model 332 c-332-8-4.Eps pin description 1 2 3 4 5 6 7 8 relay 1 – normally closed (nc) r...

  • Page 149

    Lake shore model 332 temperature controller user’s manual 8.4.1 serial interface cable wiring the following are suggested cable wiring diagrams for connecting the model 332 serial interface to various customer personal computers (pcs). Model 332 to pc serial interface – pc with de-9p model 332 de-9p...

  • Page 150

    Lake shore model 332 temperature controller user’s manual 8.4.2 ieee-488 interface connector connect to the ieee-488 interface connector on the model 332 rear with cables specified in the ieee-488-1978 standard document. The cable has 24 conductors with an outer shield. The connectors are 24-way amp...

  • Page 151

    Lake shore model 332 temperature controller user’s manual 8.5 top of enclosure remove and replace procedure warning: to avoid potentially lethal shocks, turn off controller and disconnect it from ac power line before performing this procedure. Only qualified personnel should perform this procedure. ...

  • Page 152

    Lake shore model 332 temperature controller user’s manual 8.7 loop 2 / analog output range selection the loop 2 output / analog output may be configured to supply a maximum output of either 10 w or 1 w. The recommend setting for loop 2 is 10 w which supplies a maximum of 1 a through 10 Ω. This is th...

  • Page 153

    Lake shore model 332 temperature controller user’s manual 8.9 error messages the following are error message that may be displayed by the model 332 during operation. Message description d is ab le d input is turned off. N o− cu rv e input has no curve. S .− ov er input is at or over full-scale senso...

  • Page 154

    Lake shore model 332 temperature controller user’s manual p-332-8-7.Bmp figure 8-7. Location of internal components 8-10 service.

  • Page 155

    Lake shore model 332 temperature controller user’s manual 8.10 calibration procedure the model 332 requires calibration of both of the sensor inputs and analog output to operate within specification. None of the other circuits require calibration. The sensor inputs may be configured as diode/resisto...

  • Page 156

    Lake shore model 332 temperature controller user’s manual equipment required for calibration (continued) resistor standards • resistor standards with the following nominal values. If standards are not available, ¼ w 25ppm/ o c metal film resistors can be used. They should have connectors attached to...

  • Page 157

    Lake shore model 332 temperature controller user’s manual 10 µa current source calibration and 1 µa, 100 µa, 1 ma current source output verification (continued) 7. Attach the 75 k Ω resistor to the model 332 input using proper 4-lead connection techniques, configure the dmm to read vdc and attach to...

  • Page 158

    Lake shore model 332 temperature controller user’s manual diode input ranges calibration (continued) 9. Program the gain calibration by dividing the measured value of the reference voltage by the value read in the previous step and provide the result using the calg command. Note that the gain calibr...

  • Page 159

    Lake shore model 332 temperature controller user’s manual resistive input ranges calibration (continued) 8. Via the interface obtain the input reading using the calread? Command and record this number. 9. Program the gain calibration by dividing the actual resistance of the calibration resistor by t...

  • Page 160

    Lake shore model 332 temperature controller user’s manual 8.10.3.2 thermocouple input ranges calibration purpose to determine the input offset and gain errors when the input is configured for the thermocouple ranges and provide offset and gain calibration constants back to the model 332. Process 1. ...

  • Page 161

    Lake shore model 332 temperature controller user’s manual 8.10.4 analog output calibration overview the model 332 has one analog output which requires calibration. Zero offset and gain errors are calibrated out by programming offset and gain constants to the instrument. Calibration process 8.10.4.1 ...

  • Page 162

    Lake shore model 332 temperature controller user’s manual 8.10.5 calibration specific interface commands calg gain calibration constant command input: calg , , [term] format: a,nn,±nnnnnnn specifies which input or analog output the gain calibration constant will be provided to. Valid entries are a o...

  • Page 163

    Lake shore model 332 temperature controller user’s manual calrstz reset zero offset calibration constant command input: calrstz , [term] format: a,nn specifies which input for which to reset the zero offset calibration constant to the default value. Valid entries are a or b for inputs and v for the ...

  • Page 164

    Lake shore model 332 temperature controller user’s manual 8-20 service this page intentionally left blank.

  • Page 165: Appendix A

    Lake shore model 332 temperature controller user’s manual appendix a glossary of terminology absolute zero . The temperature of –273.16 °c, or –459.69 °f, or 0 k, thought to be the temperature at which molecular motion vanishes and a body would have no heat energy. 1 accuracy . The degree of correct...

  • Page 166

    Lake shore model 332 temperature controller user’s manual autotuning . In lake shore temperature controllers, the autotuning algorithm automatically determines the proper settings for gain (proportional), reset (integral), and rate (derivative) by observing the time response of the system upon chang...

  • Page 167

    Lake shore model 332 temperature controller user’s manual decibels (db) . A unit for describing the ratio of two powers or intensities, or the ratio of a power to a reference power; equal to one-tenth bel; if p 1 and p 2 are two amounts of power, the first is said to be n decibels greater, where n =...

  • Page 168

    Lake shore model 332 temperature controller user’s manual gilbert (gb) . A cgs electromagnetic unit of the magnetomotive force required to produce one maxwell of magnetic flux in a magnetic circuit of unit reluctance. One gilbert is equal to 10/4 π ampere-turn. Named for william gilbert (1540 – 1603...

  • Page 169

    Lake shore model 332 temperature controller user’s manual kelvin scale . The kelvin thermodynamic temperature scale is the basis for all international scales, including the its-90. It is fixed at two points: the absolute zero of temperature (0 k), and the triple point of water (273.16 k), the equili...

  • Page 170

    Lake shore model 332 temperature controller user’s manual national institute of standards and technology (nist) . Government agency located in gaithersburg, maryland and boulder, colorado, that defines measurement standards in the united states. Noise (electrical). Unwanted electrical signals that p...

  • Page 171

    Lake shore model 332 temperature controller user’s manual relief valve . A type of pressure relief device which is designed to relieve excessive pressure, and to reclose and reseal to prevent further flow of gas from the cylinder after reseating pressure has been achieved. Remanence . The remaining ...

  • Page 172

    Lake shore model 332 temperature controller user’s manual susceptance . In electrical terms, susceptance is defined as the reciprocal of reactance and the imaginary part of the complex representation of admittance: [suscept(ibility) + (conduct)ance]. Susceptibility ( χ). Parameter giving an indicati...

  • Page 173: Appendix B

    Lake shore model 332 temperature controller user’s manual appendix b temperature scales b1.0 definition temperature is a fundamental unit of measurement which describes the kinetic and potential energies of the atoms and molecules of bodies. When the energies and velocities of the molecules in a bod...

  • Page 174

    Lake shore model 332 temperature controller user’s manual b-2 temperature scales table b-1. Temperature conversion table °f °c k °f °c k °f °c k -459.67 -273.15 0 -454 -270 3.15 -450 -267.78 5.37 -449.67 -267.59 5.56 -441.67 -263.15 10 -440 -262.22 10.93 -439.67 -262.04 11.11 -436 -260 13.15 -430 -2...

  • Page 175: Appendix C

    Lake shore model 332 temperature controller user’s manual appendix c handling liquid helium and nitrogen c1.0 general use of liquid helium (lhe) and liquid nitrogen (ln 2 ) is often associated with the model 332 temperature controller. Although not explosive, there are a number of safety considerati...

  • Page 176

    Lake shore model 332 temperature controller user’s manual c-2 handling lhe and ln 2 c4.0 liquid helium and nitrogen safety precautions transferring lhe and ln 2 and operation of the storage dewar controls should be in accordance with the manufacturer/supplier’s instructions. During this transfer, it...

  • Page 177: Appendix D

    Lake shore model 332 temperature controller user’s manual appendix d curve tables d1.0 general standard curve tables included in the model 332 temperature controller are as follows: curve 01 dt-470 silicon diode ........................................... Table d-1 curve 02 dt-670 silicon diode .......

  • Page 178

    Lake shore model 332 temperature controller user’s manual table d-2. Standard dt-670 diode curve breakpoint v temp. (k) breakpoint v temp. (k) breakpoint v temp. (k) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 0.090570 0.110239 0.136555 0.179181 0.265393 0.349522 0.452797 0.513...

  • Page 179

    Lake shore model 332 temperature controller user’s manual table d-4. Lake shore pt-100/-1000 platinum rtd curves break- pt-100 pt-1000 point temp. (k) ohms ( Ω) temp. (k) ohms ( Ω) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 030.0 032.0 036.0 038.0 040.0 042.0 046.0...

  • Page 180

    Lake shore model 332 temperature controller user’s manual table d-5. Lake shore rx-102a rox™ curve break- point log Ω temp. (k) break- point log Ω temp. (k) break- point log Ω temp. (k) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 3.02081 3.02133 3....

  • Page 181

    Lake shore model 332 temperature controller user’s manual table d-6. Lake shore rx-202a rox™ curve break- point log Ω temp. (k) break- point log Ω temp. (k) break- point log Ω temp. (k) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 3.35085 3.35222 3.35346 ...

  • Page 182

    Lake shore model 332 temperature controller user’s manual table d-7. Type k (nickel-chromium vs. Nickel-aluminum) thermocouple curve break- point mv temp (k) break- point mv temp (k) break- point mv temp (k) break- point mv temp (k) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 2...

  • Page 183

    Lake shore model 332 temperature controller user’s manual table d-8. Type e (nickel-chromium vs. Copper-nickel) thermocouple curve breakpt mv temp (k) breakpt mv temp (k) breakpt mv temp (k) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 4...

  • Page 184

    Lake shore model 332 temperature controller user’s manual table d-9. Type t (copper vs. Copper-nickel) thermocouple curve break- point mv temp (k) break- point mv temp (k) break- point mv temp (k) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 3...

  • Page 185

    Lake shore model 332 temperature controller user’s manual table d-10. Chromel-aufe0.03% thermocouple curve * breakpoint mv temp (k) breakpoint mv temp (k) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 -4.6667 -4.62838 -4.60347 -4.58043 -4.53965 -4.47226 -4.43743...

  • Page 186

    Lake shore model 332 temperature controller user’s manual d-10 curve tables table d-11. Chromel-aufe0.07% thermocouple curve break- point mv temp (k) break- point mv temp (k) break- point mv temp (k) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 -5.2795...