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Lake Shore 218E User Manual

Manual is about: Temperature Monitor

Summary of 218E

  • Page 1

    Revision 2.2 p/n 119-007 03 july 2012 includes coverage for: model 218s and model 218e lake shore cryotronics, inc. 575 mccorkle blvd. Westerville, ohio 43082-8888 usa internet addresses: sales@lakeshore.Com service@lakeshore.Com visit our website: www.Lakeshore.Com fax: (614) 891-1392 telephone: (6...

  • Page 2

    Lake shore model 218 temperature monitor 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 period”)...

  • Page 3: Declaration of Conformity

    Lake shore model 218 temperature monitor user’s manual b 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 218 temperature monitor user’s manual c electromagnetic compatibility (emc) for the model 218 temperature monitor electromagnetic compatibility (emc) of electronic equipment is a growing concern worldwide. Emissions of and immunity to electromagnetic interference is now part of the ...

  • Page 5: Table of Contents

    Lake shore model 218 temperature monitor user’s manual table of contents i table of contents chapter/paragraph title page 1 introduction .................................................................................................................................... 1-1 1.0 general .................

  • Page 6

    Lake shore model 218 temperature monitor user’s manual ii table of contents table of contents (continued) chapter/paragraph title page 4.5 input type........................................................................................................................ 4-5 4.5.1 optimizing the updat...

  • Page 7

    Lake shore model 218 temperature monitor user’s manual table of contents iii table of contents (continued) chapter/paragraph title page 6.2 serial interface .......................................................................................................... 6-8 6.2.1 physical connection .........

  • Page 8: List of Illustrations

    Lake shore model 218 temperature monitor user’s manual iv table of contents list of illustrations figure no. Title page 1-1 cryogenic storage dewar ............................................................................................................... 1-5 2-1 silicone diode sensor calibratio...

  • Page 9: Chapter 1

    Lake shore model 218 temperature monitor user’s manual introduction 1-1 chapter 1 introduction 1.0 general the model 218 is an eight input temperature monitor that can be used with diode or resistive temperature sensors. The measurement input was designed for the demands of cryogenic temperature mea...

  • Page 10

    Lake shore model 218 temperature monitor user’s manual 1-2 introduction table 1-1. Supported lake shore sensors 1 type model temp. Range diodes silicon diode dt-670-sd 1.4 k to 500 k silicon diode dt-670e-br 30 k to 500 k silicon diode dt-414 1.4 k to 375 k silicon diode dt-421 1.4 k to 325 k silico...

  • Page 11

    Lake shore model 218 temperature monitor user’s manual introduction 1-3 1.1 model 218 features ptc resistor measurements the model 218 can read up to eight 100 Ω, 1000 Ω ptc (positive temperature coefficient) or any other ptc resistive sensors using their standard curves or individual calibrations. ...

  • Page 12

    Lake shore model 218 temperature monitor user’s manual 1-4 introduction 1.2 model 218 specifications thermometry number of inputs: 8 input configuration: two groups of four. Each group must contain same input type measurement type: four-lead differential excitation: eight constant current sources su...

  • Page 13

    Lake shore model 218 temperature monitor user’s manual introduction 1-5 table 1-2. Model 218 sensor input performance chart sensor type silicon diode gaalas diode 100 Ω platinum rtd 500 Ω full scale 1000 Ω platinum rtd cernox™ rtd temperature coefficient negative negative positive positive negative ...

  • Page 15

    Lake shore model 218 temperature monitor user’s manual introduction 1-7 1.3 safety 1.3.1 handling liquid helium and liquid nitrogen liquid helium (lhe) and liquid nitrogen (ln 2 ) may be used in conjunction with the model 218. Although lhe and ln 2 are not explosive, there are certain safety conside...

  • Page 16

    Lake shore model 218 temperature monitor user’s manual 1-8 introduction 1.3.2 safety summary observe these general safety precautions during all phases of instrument operation, service, and repair. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates s...

  • Page 17: Chapter 2

    Lake shore model 218 temperature monitor user’s manual sensor considerations 2-1 chapter 2 sensor considerations 2.0 general selecting the proper sensor is vital to good temperature monitoring. This chapter covers temperature sensor selection in paragraph 2.1, calibrated sensors in paragraph 2.2, an...

  • Page 18

    Lake shore model 218 temperature monitor user’s manual 2-2 sensor considerations 2.1.4 measurement accuracy temperature measurements have several sources of error. Account for errors induced by both the sensor and the instrumentation when computing accuracy. The instrument has measurement error in b...

  • Page 19

    Lake shore model 218 temperature monitor user’s manual sensor considerations 2-3 the model 218 also performs softcal™ calibration. The user provides 1, 2, or 3 known temperature reference points. Calibration range and accuracy depend on these points (paragraph 5.2). 2.2.3 standard curves some types ...

  • Page 20

    Lake shore model 218 temperature monitor user’s manual 2-4 sensor considerations 2.2.4 calcurve™ the calcurve™ service provides the user with a convenient way to get the temperature response curve from lake shore’s calibrated sensors into instruments like the model 218. It can be performed at the fa...

  • Page 21

    Lake shore model 218 temperature monitor user’s manual sensor considerations 2-5 2.3.4 contact area thermal contact area greatly affects thermal conductivity because a larger area has more opportunity to transfer heat. Even when the size of a sensor package is fixed, thermal contact area can be impr...

  • Page 22

    Lake shore model 218 temperature monitor user’s manual 2-6 sensor considerations 2.3.6 lead wire different types of sensors come with different types and lengths of electrical leads. In general a significant length of lead wire must be added to the sensor for proper heat sinking and connecting to a ...

  • Page 23: Chapter 3

    Lake shore model 218 temperature monitor user’s manual installation 3-1 chapter 3 installation 3.0 general this chapter covers general model 218 installation instructions: inspection and unpacking in paragraph 3.1, repackaging for shipment in paragraph 3.2, and rear panel definition in paragraph 3.3...

  • Page 24

    Lake shore model 218 temperature monitor user’s manual 3-2 installation 3.3 rear panel definition caution: verify that the ac line voltage shown in the window on the fuse holder is appropriate for the intended ac power input. If the voltage setting is changed, remove and verify the proper fuse is in...

  • Page 25

    Lake shore model 218 temperature monitor user’s manual installation 3-3 3.3.1.1 line voltage the model 218 has four different ac line voltages configurations so that it can be operated from line power anywhere in the world. The nominal voltage and voltage range of each configuration is shown in tabl...

  • Page 26

    Lake shore model 218 temperature monitor user’s manual 3-4 installation 3.3.2 sensor inputs this section covers sensor input connector and pinout in paragraph 3.3.2.1, sensor lead cable in paragraph 3.3.2.2, grounding and shielding sensor leads in paragraph 3.3.2.3, sensor polarity in paragraph 3.3....

  • Page 27

    Lake shore model 218 temperature monitor user’s manual installation 3-5 3.3.2.2 sensor lead cable the sensor lead cable used outside the cooling system can be much different form what is used inside. Between the instrument and vacuum shroud, heat leak is not a problem, but error and noise pick up ne...

  • Page 28

    Lake shore model 218 temperature monitor user’s manual 3-6 installation four-lead sensor measurement (continued) in a four lead measurement, current leads and voltage leads run separately to the sensor. With separate leads, there is little current in the voltage leads so their resistance does not en...

  • Page 29

    Lake shore model 218 temperature monitor user’s manual installation 3-7 3.3.3 terminal block (model 218s only) the terminal block on the model 218s rear panel contains signals for analog outputs and alarm relays. The terminal block connectors are detachable; remove the top or bottom half from the in...

  • Page 30

    Lake shore model 218 temperature monitor user’s manual 3-8 installation 3.3.3.1 relays (model 218s only) the model 218 has eight relays most commonly associated with the alarm feature. If a relay is inactive (off), it is in its normal state of open or closed. When the relay is active (on), it is in ...

  • Page 31: Chapter 4

    Lake shore model 218 temperature monitor user’s manual operation 4-1 chapter 4 operation 4.0 general this chapter covers model 218 front panel operation. Display screen description in paragraph 4.1, keypad description in paragraph 4.2, turning power on in paragraph 4.3, display setup in paragraph 4....

  • Page 32

    Lake shore model 218 temperature monitor user’s manual 4-2 operation display screen description (continued) f-218-4-2.Eps figure 4-2. Model 218 normal display screen format source annunciators k ....................................... Sensor input data in kelvin c ......................................

  • Page 33

    Lake shore model 218 temperature monitor user’s manual operation 4-3 4.2 keypad description the model 218 has a 4-row by 5-column sealed membrane keypad. Keys are used for both beginning a setting change sequence and numeric data entry. The function of each key is described below followed by general...

  • Page 34

    Lake shore model 218 temperature monitor user’s manual 4-4 operation 4.2.1 general keypad operation there are three basic keypad operations: direct operation, setting selection, and data entry. Direct operation is where the key function occurs as soon as the key is pressed. Log on/off, local and ala...

  • Page 35

    Lake shore model 218 temperature monitor user’s manual operation 4-5 display setup (continued) use the data selection keys to cycle through input selections (1-8 or none) for the selected display location. Select none to blank the display location. Press enter when the desired input appears. The sam...

  • Page 36

    Lake shore model 218 temperature monitor user’s manual 4-6 operation input type (continued) use the data selection keys to cycle through the different sensor types for input group 5-8. When the desired type appears, press enter. The third display in the setting sequence appears. Use the data selecti...

  • Page 37

    Lake shore model 218 temperature monitor user’s manual operation 4-7 4.5.1 optimizing the update rate the maximum update rate of the model 218 is 16 readings per second allowing all eight inputs to be read twice each second. Turning off unused inputs (paragraph 4.1.5) permits a higher reading rate o...

  • Page 38

    Lake shore model 218 temperature monitor user’s manual 4-8 operation curve select (continued) to select a temperature response curve, press curve select. The display below appears. Use the data selection keys to cycle through the inputs (1-8) for which to select a temperature response curve. Press e...

  • Page 39

    Lake shore model 218 temperature monitor user’s manual operation 4-9 max/min (continued) use the data selection keys to select the sensor input (1-8) from which to capture and store the highest (max) and lowest (min) reading. Press enter when the desired input appears. The third display in the math ...

  • Page 40

    Lake shore model 218 temperature monitor user’s manual 4-10 operation linear (continued) press enter when the desired source appears. In the fifth display of the math setting sequence, specify the m variable, then press enter. Resolution is 5 digits (0.0001 to 9999.9). In the sixth display of the ma...

  • Page 41

    Lake shore model 218 temperature monitor user’s manual operation 4-11 filter (continued) press enter to continue. The eighth display of the math setting sequence appears. Use the data selection keys to select the number of filter points, from 2 to 64. Press enter. The ninth display of the math setti...

  • Page 42

    Lake shore model 218 temperature monitor user’s manual 4-12 operation analog outputs (continued) analog output input mode select input to set output voltage proportional to an input reading. Several parameters associated with this mode allow flexibility. After selecting input mode, the screen to the...

  • Page 43

    Lake shore model 218 temperature monitor user’s manual operation 4-13 4.8.1 example of low and high analog parameter setting with the analog output set to input mode, the temperature input data and voltage output data can be related as shown in the top diagram. This setup results in a wide temperatu...

  • Page 44

    Lake shore model 218 temperature monitor user’s manual 4-14 operation alarms setup and operation (continued) the third display of the setting sequence appears, use the data selection keys to cycle through source selections for the selected input. There are four source options: k kelvin temperature r...

  • Page 45

    Lake shore model 218 temperature monitor user’s manual operation 4-15 4.10 alarm reset alarm reset resets a latched active alarm after the alarm condition has been cleared. If the alarm condition is not cleared, the alarm activates again during the next sensor input update cycle. Alarm reset does no...

  • Page 46

    Lake shore model 218 temperature monitor user’s manual 4-16 operation 4.12 locking the keypad the model 218 keypad lock feature prevents accidental changes to parameter values. When the keypad is locked, some parameter values may be viewed, but most cannot be changed over the front panel. Alarm rese...

  • Page 47: Chapter 5

    Lake shore model 218 temperature monitor user’s manual special features 5-1 chapter 5 special features 5.0 general this chapter covers front panel curve entry in paragraph 5.1, softcal™ in paragraph 5.2, data logging in paragraph 5.3, and printing in paragraph 5.4. Most users will not find it necess...

  • Page 48

    Lake shore model 218 temperature monitor user’s manual 5-2 special features 5.1.2 curve breakpoints reduce the temperature response data of a calibrated sensor to a table of breakpoints before entering it into the instrument. Each breakpoint consists of a value in sensor units and a corresponding te...

  • Page 49

    Lake shore model 218 temperature monitor user’s manual special features 5-3 5.1.4 entering a new curve to begin entering a user curve, press curve entry. The first screen appears. Use the data selection keys to select edit curve, then press enter. The second display in the setting sequence appears. ...

  • Page 50

    Lake shore model 218 temperature monitor user’s manual 5-4 special features 5.1.5 erasing user curves to erase a user curve, press curve entry. The screen below appears. Use the data selection keys to select erase curve, then press enter. The second display in the sequence appears. Use the data sele...

  • Page 51

    Lake shore model 218 temperature monitor user’s manual special features 5-5 copying curves (continued) use the s or t key to select the curve number to copy from. Once the curve number is selected, press the enter key. You will see the following message. Use the s or t key to select the input number...

  • Page 52

    Lake shore model 218 temperature monitor user’s manual 5-6 special features 5.2.1 softcal™ and silicon diode sensors lake shore silicon diode sensors incorporate remarkably uniform sensing elements that exhibit precise, monotonic, and repeatable temperature response. For example, the lake shore dt-4...

  • Page 53

    Lake shore model 218 temperature monitor user’s manual special features 5-7 5.2.2 softcal™ accuracy with silicon diode sensors note: a softcal™ calibration is only as good as the accuracy of the calibration points. The accuracies listed for softcal™ assume ±0.05 k for 77.35 k (liquid nitrogen) and 3...

  • Page 54

    Lake shore model 218 temperature monitor user’s manual 5-8 special features 5.2.4 softcal™ accuracy with platinum sensors note: a softcal™ calibration is only as good as the accuracy of the calibration points. The accuracies listed for softcal™ assume ±0.05 k for 77.35 k (liquid nitrogen) and 305 k ...

  • Page 55

    Lake shore model 218 temperature monitor user’s manual special features 5-9 softcal™ calibration curve creation (continued) the sixth display in the setting sequence appears. Use the number keys to input the voltage or resistance of the third calibration data point, then press enter. Use the number ...

  • Page 56

    Lake shore model 218 temperature monitor user’s manual 5-10 special features log setup (continued) yes data logging continues beyond the maximum number of records specified and overwrites old records with new. No data logging stops at the maximum number of records specified. The third display in the...

  • Page 57

    Lake shore model 218 temperature monitor user’s manual special features 5-11 5.3.2 starting and stopping data log the log on/off key is used to start and stop data logging. The start and overwrite parameters set with log setup determine the operation of log on/off key. If start is set to clear, the ...

  • Page 58

    Lake shore model 218 temperature monitor user’s manual 5-12 special features 5.4 printing the model 218 can send sensor input data to a printer for a hard copy temperature record. The instrument’s serial port interfaces with standard printers. The serial computer interface and a printer cannot be us...

  • Page 59

    Lake shore model 218 temperature monitor user’s manual special features 5-13 5.4.2 printer connector & cable for most serial printers, a standard pc to printer cable may be used. F-218-5-3.Bmp pin description 1 no connection (nc) 2 receive data (rd in) 3 transmit data (td out) 4 data terminal ready ...

  • Page 60

    Lake shore model 218 temperature monitor user’s manual 5-14 special features printer operation (continued) print continuous directs log records to the printer instead of internal memory. Setup the data log feature as described in paragraph 5.3.1. The log period must be greater than 10 seconds when p...

  • Page 61: Chapter 6

    Lake shore model 218 temperature monitor user’s manual remote operation 6-1 chapter 6 remote operation 6.0 general this chapter provides operational instructions for the computer interface for the lake shore model 218 temperature monitor. Either of the two computer interfaces provided with the model...

  • Page 62

    Lake shore model 218 temperature monitor user’s manual 6-2 remote operation 6.1.1 ieee-488 interface settings if using the ieee-488 interface, you must set the ieee address and terminators. Press the interface key. The first screen selects serial interface baud rate, and therefore is skipped by pres...

  • Page 63

    Lake shore model 218 temperature monitor user’s manual remote operation 6-3 bus control commands (continued) finally, addressed bus control commands are multiline commands that must include the model 218 listen address before the instrument responds. Only the addressed device responds to these comma...

  • Page 64

    Lake shore model 218 temperature monitor user’s manual 6-4 remote operation status byte register and service request enable register (continued) service request (srq) bit (6) – determines whether the model 218 is to report via the srq line and six bits determine which status reports to make. If bits...

  • Page 65

    Lake shore model 218 temperature monitor user’s manual remote operation 6-5 standard event status register and standard event status enable register (continued) query error (qye) bit (2) – the qye bit indicates a query error. It occurs rarely and involves loss of data because the output queue is ful...

  • Page 66

    Lake shore model 218 temperature monitor user’s manual 6-6 remote operation table 6-1. Sample 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 configur...

  • Page 67

    Lake shore model 218 temperature monitor user’s manual remote operation 6-7 c-460-6-1.Bmp figure 6-1. Typical national instruments gpib configuration from ibconf.Exe.

  • Page 68

    Lake shore model 218 temperature monitor user’s manual 6-8 remote operation 6.2 serial interface overview the serial interface used in the model 218 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 c...

  • Page 69

    Lake shore model 218 temperature monitor user’s manual remote operation 6-9 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. T...

  • Page 70

    Lake shore model 218 temperature monitor user’s manual 6-10 remote operation 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 transmittin...

  • Page 71

    Lake shore model 218 temperature monitor user’s manual remote operation 6-11 6.2.7 serial interface basic 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 instruc...

  • Page 72

    Lake shore model 218 temperature monitor user’s manual 6-12 remote operation table 6-3. 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 re...

  • Page 73

    Lake shore model 218 temperature monitor user’s manual remote operation 6-13 table 6-4. 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...

  • Page 74

    Lake shore model 218 temperature monitor user’s manual 6-14 remote operation 6.2.7.2 quick basic serial interface program setup the serial interface program (table 6-5) 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 use...

  • Page 75

    Lake shore model 218 temperature monitor user’s manual remote operation 6-15 6.2.7.3 program operation once either 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]...

  • Page 76

    Lake shore model 218 temperature monitor user’s manual 6-16 remote operation 6.2.8 trouble shooting new installation 1. Check instrument baud rate 2. Make sure transmit (td) signal line from the instrument is routed to receive (rd) on the computer and vice versa. (use a null modem adapter if not). 3...

  • Page 77

    Lake shore model 218 temperature monitor user’s manual remote operation 6-17 table 6-5. Model 218 interface commands by function command function page q cls clear interface ...................................... 18 q ese set std. Event status enable ............... 18 q ese? Query std. Event status ...

  • Page 78

    Lake shore model 218 temperature monitor user’s manual 6-18 remote operation ieee-488/serial interface commands (alphabetical listing) q cls clear interface command input: q cls returned: nothing remarks: clears bits in the status byte register and standard event status register and terminates all p...

  • Page 79

    Lake shore model 218 temperature monitor user’s manual remote operation 6-19 q opc? Query operation complete input: q opc? Returned: 1. Format: n[term] remarks: places a “1” in the controller output queue upon completion of all pending selected device operations. Send this as the last command in a c...

  • Page 80

    Lake shore model 218 temperature monitor user’s manual 6-20 remote operation alarm configure input alarm parameters input: alarm ,,, value>,,, returned: nothing. Remarks: configures the alarm parameters for an input. Specifies which input to configure(1-8). Determines whether the instrument checks t...

  • Page 81

    Lake shore model 218 temperature monitor user’s manual remote operation 6-21 analog configure analog output parameters input: analog ,,,,,, value>, returned: nothing. Remarks: specifies which analog output to configure (1 or 2). Specifies analog output: 0 = positive only, or 1 = bipolar. Specifies d...

  • Page 82

    Lake shore model 218 temperature monitor user’s manual 6-22 remote operation crdg? Query celsius reading for a single input or all inputs input: crdg? Returned: .Format: +/-nn.Nnn[term]. Or if all inputs are queried: ,,, celsius value>,,, value>,. Format: +/-nn.Nnn,+/-nn.Nnn,+/-nn.Nnn,+/-nn.Nnn,+/- ...

  • Page 83

    Lake shore model 218 temperature monitor user’s manual remote operation 6-23 crvpt? Query curve data point input: crvpt? , returned: , . Format: +nnn.Nnn,+nnn.Nnn[term] remarks: returns a standard or user curve data point. See crvpt command for parameter descriptions. Specifies which curve to query....

  • Page 84

    Lake shore model 218 temperature monitor user’s manual 6-24 remote operation filter configure input filter parameters input: filter , , , returned: nothing. Remarks: specifies input to configure (1-8). Specifies whether the filter function is off or on. 0 = off, 1 = on. Specifies how many data point...

  • Page 85

    Lake shore model 218 temperature monitor user’s manual remote operation 6-25 input configure input control parameter input: input , returned: nothing. Remarks: turns selected input on or off. Specifies which input to configure(1-8). Disables/enables input. 0 = off, 1 = on. Example: input 4,0 - input...

  • Page 86

    Lake shore model 218 temperature monitor user’s manual 6-26 remote operation linear configure input linear equation parameters input: linear , , , returned: nothing. Remarks: configures the linear equation for an input. Specifies input to configure (1-8). Specifies a value for m in the equation. Spe...

  • Page 87

    Lake shore model 218 temperature monitor user’s manual remote operation 6-27 logread configure log records input: logread , , returned: nothing. Remarks: configures log records. The individual reading number (1-8) within a log record to configure. The input number to log (1-8). Specifies data source...

  • Page 88

    Lake shore model 218 temperature monitor user’s manual 6-28 remote operation lrdg? Query linear equation data for a single input or all inputs. Input: lrdg? Returned: . Format: +/-nn.Nnn[term] or if all inputs are queried: ,,, value>,,,, linear value>. Format: +/-nn.Nnn,+/-nn.Nnn,+/-nn.Nnn,+/-nn.Nnn...

  • Page 89

    Lake shore model 218 temperature monitor user’s manual remote operation 6-29 rdgst? Query input status input: rdgst? Returned: . Format: nnn[term]. Remarks: the integer returned represents the sum of the bit weighting of the input status flag bits. Specifies which input to query. Bit bit weighting s...

  • Page 90

    Lake shore model 218 temperature monitor user’s manual 6-30 remote operation scal generate softcal™ curve input: scal , , , , , , , value>, returned: nothing. Remarks: specifies the standard curve to generate a softcal™ from (1,6,7). Specifies the user curve to store the softcal™ curve (21 – 28). Sp...

  • Page 91: Chapter 7

    Lake shore model 218 temperature monitor user’s manual service 7-1 chapter 7 service 7.0 general this chapter provides general service information for the model 218 temperature monitor. There is no calibration procedure for the model 218. There are no serviceable parts inside the model 218. Contact ...

  • Page 92

    Lake shore model 218 temperature monitor user’s manual 7-2 service eu_fuse.Bmp figure 7-1. Fuse drawer f-218-7-2.Eps figure 7-2. Power fuse access 7.2.2 handling electrostatic discharge sensitive components observe all precautions necessary to prevent damage to esds components before attempting inst...

  • Page 93

    Lake shore model 218 temperature monitor user’s manual service 7-3 7.5 fuse replacement use the following procedure to remove and replace a line fuse. Warning: to avoid potentially lethal shocks, turn off controller and disconnect it from ac power before performing these procedures. Caution: for con...

  • Page 94

    Lake shore model 218 temperature monitor user’s manual 7-4 service 7.7 terminal block (model 218s only) f-218-7-4.Eps pin description pin description 1 relay 1 nc 15 relay 5 nc 2 relay 1 com 16 relay 5 com 3 relay 1 no 17 relay 5 no 4 relay 2 nc 18 relay 6 nc 5 relay 2 com 19 relay 6 com 6 relay 2 n...

  • Page 95

    Lake shore model 218 temperature monitor user’s manual service 7-5 7.8 ieee-488 interface connector (model 218s only) connect to the ieee-488 interface connector on the model 218 rear with cables specified in the ieee-488-1978 standard document. The cable has 24 conductors with an outer shield. The ...

  • Page 96

    Lake shore model 218 temperature monitor user’s manual 7-6 service 7.9 serial interface cable and adapters 218 to pc serial interface – pc with de-9p 218 de-9p standard null-modem cable (de-9s to de-9s) pc de-9p 5 - gnd 5 - gnd 2 - rd (in) 3 - td (out) 3 - td (out) 2 - rd (in) 4 - dtr (out) 6 - dsr ...

  • Page 97

    Lake shore model 218 temperature monitor user’s manual service 7-7 f-218-7-6.Bmp model 218 computers and printers 218 de-9p db-25p de-9p pin description pin description pin description 1 no connection (nc) 2 td (out) 1 dcd (in) 2 receive data (rd in) 3 rd (in) 2 rd (in) 3 transmit data (td out) 4 rt...

  • Page 98

    Lake shore model 218 temperature monitor user’s manual 7-8 service 7.11 eprom and novram replacement the operating software for the model 218 is contained on one erasable programmable read only memory (eprom) integrated circuit (ic). The reference designator for the eprom is u17. See figure 7-7. The...

  • Page 99

    Lake shore model 218 temperature monitor user’s manual service 7-9 f-218-7-7.Bmp figure 7-7. Location of internal components.

  • Page 100

    Lake shore model 218 temperature monitor user’s manual 7-10 service 7.13 calibration procedure both groups of sensor inputs require calibration. Sensor input groups consist of 4 separate current sources which can supply 10 µa or 1 ma of current. They are calibrated by adjusting pots on the model 218...

  • Page 101

    Lake shore model 218 temperature monitor user’s manual service 7-11 7.13.5 zero calibration purpose: to determine the zero offset of the input stage and provide an offset constant back to the model 218. Config: same as paragraph 7.13.4 above except that only the 3 rd input of the group is enabled. A...

  • Page 102

    Lake shore model 218 temperature monitor user’s manual 7-12 service process: adjust the four current source calibration pots on the model 218 main board until each of the 4 inputs display exactly 2.0000 v. 7.13.9 250 Ω input gain calibration purpose: to determine the input gain errors when the input...

  • Page 103

    Lake shore model 218 temperature monitor user’s manual service 7-13 7.13.12 5 k Ω input gain calibration purpose: to determine the input gain errors when the input is configured for 5 kΩ input and provide gain calibration constants back to the model 218. Config: attach the precision 5 kΩ resistors t...

  • Page 104

    Lake shore model 218 temperature monitor user’s manual 7-14 service 7.13.15 calibration specific interface commands adcal calibrates a/d linearity input: adcal returned: nothing remarks: calibrates the a/d linearity of the selected input group. Before issuing command the input group must be configur...

  • Page 105

    Lake shore model 218 temperature monitor user’s manual service 7-15 gcal? Returns the gain calibration constant for the selected input input: gcal? , returned: value of gain calibration constant for the selected input. Remarks: see gcal command for description of returned data. Specifies which input...

  • Page 106

    Lake shore model 218 temperature monitor user’s manual 7-16 service this page intentionally left blank.

  • Page 107: Chapter 8

    Lake shore model 218 temperature monitor user’s manual accessories 8-1 chapter 8 accessories 8.0 general this chapter provides information on the model numbers, options, and accessories available for the model 218 temperature monitor. Model numbers are detailed in paragraph 5.1, options in paragraph...

  • Page 108

    Lake shore model 218 temperature monitor user’s manual 8-2 accessories accessories (continued) model description of accessories 9001-00x lake shore cryogenic wire. Lake shore sells the following types of cryogenic wire: dt = duo-twist™, mn = single strand, mw = manganin, nc = nichrome heater, nd = h...

  • Page 109

    Lake shore model 218 temperature monitor user’s manual accessories 8-3 c-218-8-1.Bmp figure 8-1. Model rm-1/2 rack-mount kit.

  • Page 110

    Lake shore model 218 temperature monitor user’s manual 8-4 accessories c-218-8-2.Bmp figure 8-2. Model rm-2 dual rack-mount shelf.

  • Page 111: Appendix A

    Lake shore model 218 temperature monitor user’s manual appendix a a-1 appendix a curve tables a1.0 general the following are curve tables applicable to the model 218 temperature monitor. Table a-1. Standard dt-470 diode curve breakpoint v temp. (k) breakpoint v temp. (k) breakpoint v temp. (k) 1 2 3...

  • Page 112

    Lake shore model 218 temperature monitor user’s manual a-2 appendix a table a-2. Other standard diode and platinum curves breakpoint dt-500-d diode cti diode platinum 100 ohm platinum 1000 ohm number v temp. (k) v temp. (k) ohms temp. (k) ohms temp. (k) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1...