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Keithley 7706 User Manual - Connection

Summary of 7706

  • Page 1

    Model 7706 multiplexer card user’s guide pa-719 rev. C / 2-00 a g r e a t e r m e a s u r e o f c o n f i d e n c e the model 7706 can be used with keithley models 2700, 2701, and 2750. All references to the model 2700 also apply to the models 2701 and 2750..

  • Page 2: Warranty

    Warranty keithley instruments, inc. Warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment. Keithley instruments, inc. Warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes...

  • Page 3: Safety Precautions

    Safety precautions the following safety precautions should be observed before using this product and any associated instrumentation. Although some in- struments and accessories would normally be used with non-haz- ardous voltages, there are situations where hazardous conditions may be present. This ...

  • Page 4

    If or is present, connect it to safety earth ground using the wire recommended in the user documentation. The symbol on an instrument indicates that the user should re- fer to the operating instructions located in the manual. The symbol on an instrument shows that it can source or mea- sure 1000 vol...

  • Page 5: Model 7706 All-In-One Module

    Model 7706 all-in-one module connection, operation, calibration, and parts information introduction this packing sheet contains information specific to the model 7706 module. If you have any questions after reviewing this in- formation, please contact your local keithley representative or call one o...

  • Page 6: Connection

    2 model 7706 module connection the model 7706 is a 20-channel differential multiplexer card with the following features: • 20 channels of analog input with 300v, 1a capacity; 60w, 125va maximum • 16 channels of digital output for output control • one event counter/totalizer • two analog outputs (±12...

  • Page 7

    3 connection figure 1 simplified schematic for model 7706 notes connect 4-wire sense leads using channels 11–20. To disconnect channels 11–20 from channels 1–10, send: :rout:mult:clos (@126) (note opposite logic) channel 22 note non-isolated grounds ( ) are referenced to chassis ground. Channel 23 d...

  • Page 8

    4 model 7706 module when automatically configured for 4-wire measurements (including 4-wire Ω , rtd temperature, ratio, and channel average) the channels are paired as follows: card configuration—connections warning the information in this section is intended for qualified service personnel. Do not ...

  • Page 9

    5 connection figure 3 model 7706 screw terminal channel designations wiring procedure warning the information in this section is intended for qualified service personnel. Do not attempt to perform this procedure unless qualified to do so. Use the following procedure to wire the model 7706 module. Ma...

  • Page 10

    6 model 7706 module warning all wiring must be rated for the maximum voltage in the system. For example, if 1000v is applied to the front terminals of the model 2700, the plug-in module wiring must be rated for 1000v. 1. Make sure all power is discharged from the model 7706 module. 2. Access the scr...

  • Page 11

    7 connection typical connections (channels 1–20) the following examples show typical wiring connections for the following types of measurements: • thermocouple connections, see figure 5 • Ω 2-wire and thermistor connections, see figure 6 • Ω 4-wire and rtd connections, see figure 7 • voltage (ac or ...

  • Page 12

    8 model 7706 module figure 7 Ω 4-wire and rtd connections figure 8 voltage connections (dc or ac) channel 1 hi lo channel 10 hi lo (channels 2–9) channel 11 hi lo channel 20 hi lo (channels 12–19) rtd Ω4-wire channel 1 hi lo channel 20 hi lo (channels 2–19) + + dc voltage ac voltage.

  • Page 13

    9 connection digital outputs (channels 21–22) use the model 7706 digital outputs to control indicators, fixtures, switches, solenoids, loads, relays, etc. Figure 9 shows a sim- plified schematic of the digital output. Figure 9 simplified schematic of digital output setting the digital output in 8-bi...

  • Page 14

    10 model 7706 module figure 10 sample digital output for channel 21 bit position binary value decimal weight weights b7 b6 b4 b3 b5 b2 b1 b0 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 multiply the binary values by the decimal weight binary value equivalent decimal weight channel 21 = 138 (this is the nrf value...

  • Page 15

    11 connection figure 11 sample digital output for channel 22 bit position binary value decimal weight weights b7 b6 b4 b3 b5 b2 b1 b0 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 multiply the binary values by the decimal weight binary value equivalent decimal weight channel 22 = 137 (this is the nrf value in the...

  • Page 16

    12 model 7706 module setting the digital outputs in 16-bit (word) note setting the digital output in 16-bit (word) can be accomplished only over the bus (no front panel operation). To set the digital outputs in 16-bit, send the decimal equivalent of the binary pattern desired (similar to 8-bit). The...

  • Page 17

    13 connection figure 12 sample sending a digital output word (16-bit) b15 b14 b12 b11 b13 b10 b9 b8 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 bit position binary value weights b7 b6 b4 b3 b5 b2 b1 b0 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 equivalent decimal weight decimal weight binary value = 49288 (this is the nrf...

  • Page 18

    14 model 7706 module figure 13 typical digital output with external power supply figure 14 typical digital output (no external power supply) output +5v + - 42v (maximum) model 7706 module digital output terminal digital ground (non-isolated, referenced to chassis) user supplied circuitry output +5v ...

  • Page 19

    15 connection analog outputs (channels 23–24) caution analog output current limit: 5ma (maximum). The model 7706 contains two dac (digital to analog converters). Use these analog outputs for tasks such as applying a voltage bias to duts or analog control. The two analog outputs of the model 7706 are...

  • Page 20

    16 model 7706 module sample 2: set analog output 2 (channel 24) to -5.5v to set analog output 2 using the front panel: under the shift->card menu, key in the decimal value (for this example, -5.5) for the menu item “aout2: +xx.Xx”, and press enter. To set channel 24 (analog output 2) over the bus, s...

  • Page 21

    17 connection loading effects loading of the voltage source becomes a consideration for low resistance loads. As the source resistance increases, the error caused by loading increases. Figure 17 shows the method used to determine the percent error due to loading where: v s is the programmed analog o...

  • Page 22

    18 model 7706 module totalizer use the totalizer to count more than 4 billion on/off events (contact closures, revolutions, power cycles, etc.). The totalizer can be accessed from the front panel or over the bus. Figure 18 shows a simplified schematic of the totalizer connected to a function generat...

  • Page 23

    19 connection threshold detection the totalizer can count events at a rate of up to 100khz. The count can be initiated manually or by configuring a scan. When counting, the totalizer can: • reset to zero every time it is read. • count on the rising or falling edge of the input signal. • count ac or ...

  • Page 24

    20 model 7706 module gating provides specific control over when the totalizer readings are taken. A gate always is interpreted if no gating signal is present. To control counting through the g+ screw terminal, send a ttl high signal to enable counting and a ttl low signal to disable counting. To con...

  • Page 25

    21 connection 1 special keys and power switch: normal operation. 2 function and operation keys: top row unshifted dcv, acv, dci, aci, Ω 2, Ω 4, freq, temp blocked. Shifted ratio,ch-avg, cont, ocomp, period blocked. Middle row unshifted trig triggers the unit to read the current totalizer count. And ...

  • Page 26

    22 model 7706 module limits and analog trigger the limit subsystem and analog scan triggering works the same for the totalize function as for any other model 2700 function with the exception that only the upper limit is evaluated. The lower limit setting is ignored by the totalize function. The tota...

  • Page 27

    23 connection figure 22 monitor scan example 4 measurements ? Measure totalizer close monitor channel (125) no yes measure open last chan close next chan close first channel return to monitor mode no yes scan 100,000 counts ? Scan mode: monitor mode:.

  • Page 28

    24 model 7706 module specifications full model 7706 specifications are included at the end of this guide. Connection log make a copy of table 2 and affix it to the cover of the model 7706. Use this to record connection information and channel de- scriptions as needed. Table 1 monitor scan example (f...

  • Page 29

    25 connection table 2 connection log model 7706 channel color description input h l sense h l ch1 h l ch2 h l ch3 h l ch4 h l ch5 h l ch6 h l ch7 h l ch8 h l ch9 h l ch10 h l ch11 h l ch12 h l ch13 h l ch14 h l ch15 h l ch16 h l ch17 h l ch18 h l ch19 h l ch20 h l ch21 b0 b1 b2 b3 b4 b5 b6 b7 gnd ch...

  • Page 30: Front Panel Operation

    26 model 7706 module front panel operation card specific menu to open the card specific menu, press shift->card (card is over the right arrow key). This menu contains all card- specific functions from the front panel. For example, the analog outputs of a 7706 card would be configured from here. A sa...

  • Page 31: Bus Commands

    27 bus commands bus commands when issuing commands over the bus, keep the following channel usage in mind: sending channel numbers express channel numbers as a three-digit number where the first digit is the slot number. For example, channel 1 on slot 1 would be channel 101, and channel 5 on slot 2 ...

  • Page 32

    28 model 7706 module output subsystem commands to perform output operations are listed in table 4 . Details on these commands follow the table. Note the output subsystem is specific to the model 7706 module. It is only available if a model 7706 is installed. :output as mentioned in table 3 , channel...

  • Page 33

    29 bus commands :digital :byte , — use to force the digital output of the given channel[s] to the desired value (0 × format. Use this command to write to channel 21 or 22 individually. Bit 0 of each port is the lsb. :byte? — query the present bit pattern (0 × this command to query channel 21 or 22 i...

  • Page 34: Verification

    30 model 7706 module unsupported scpi commands note the display will indicate which cards are installed immediately after showing the firmware revision at power-up. The rout:scan:nvolatile command is not supported for model 7706 module operation. Attempts to set rout:scan:nvol on with a 7706 card pr...

  • Page 35

    31 verification 14. Close channel 2: a. Press the close key. B. Key in 102. 15. Set analog output 2 to +10v: a. Open the shift-card menu (press shift-card). B. Key in analog output for aout2:+10.000v. 16. Verify analog output reading is within stated limits. 17. Set analog output 2 to -10v: a. Open ...

  • Page 36

    32 model 7706 module totalizer warning the information contained in this section is intended only for qualified service personnel. Do not attempt these procedures unless you are qualified to do so. Note correctly wire and install the model 7706 in the model 2700 before turning on the model 2700. Use...

  • Page 37

    33 verification figure 25 verification—totalizer connections 50 coax cable function generator function output te2 te3 te1 j3 te4 te5 te6 te7 j2 te3 j2 gate + gate - in - in + threshold jumper (j2) closed (1-2 ttl).

  • Page 38: Calibration

    34 model 7706 module calibration the following procedures calibrate the temperature sensors on the model 7706 plug-in module as well as the analog outputs. Recommended test equipment in order to calibrate the model 7706, you will need equipment summarized in table 7 . Extender board connections the ...

  • Page 39

    35 calibration remote model 7706 temperature calibration 1. Connect the model 7706 to the 7798-250b calibration/extender board. 2. With the power off, install the model 7706/7798 combination in slot 1, and select the rear inputs with the inputs switch. 3. Press in and hold the model 2700 open key wh...

  • Page 40: Calibration Commands

    36 model 7706 module remote model 7706 analog output (dac) calibration 1. Connect the model 7706 ch23 and 24 to ch1 and 2 (use the same connection setup as in figure 24 ) : • connect ch23 h and l terminals to ch1 h and l terminals (h to h; l to l). • connect ch24 h and l terminals to ch2 h and l ter...

  • Page 41

    37 calibration commands table 8 model 7706 calibration commands command description :calibration calibration root command. :protected all commands in this subsystem are protected by the calibration lock (except queries and :code). :code '' send calibration code. (default ki002700) :card1 path to car...

  • Page 42

    38 model 7706 module :code (:calibration:protected:code) notes the :code command should be sent only once before performing calibration. Do not send :code before each calibration step. The code parameter must be enclosed in single quotes. Purpose to program the calibration code or password so that y...

  • Page 43

    39 calibration commands :date? (:calibration:protected:card1:date?) (:calibration:protected:card2:date?) purpose to request the model 7706 calibration date. Format :cal:prot:card1:date? :cal:prot:card2:date? Response , , description the :card1:date? And :card2:date? Queries allow you to read back th...

  • Page 44

    40 model 7706 module :lock? (:calibration:protected:card1:lock?) purpose to read model 7706 calibration lock status. Format :cal:prot:card1:lock? Response 0 calibration locked. 1 calibration unlocked. Description the :lock? Query requests status from the model 2700 on model 7706 calibration locked/ ...

  • Page 45

    41 calibration commands :step0 (:calibration:protected:card1:step0) purpose to perform model 7706 temperature calibration. Format :cal:prot:card1:step0 parameter = cold calibration temperature (°c) description :step0 performs temperature sensor calibration of the model 7706. The card must be allowed...

  • Page 46: Remote Error Reporting

    42 model 7706 module (:calibration:protected:card1:step0) purpose to perform model 7706 temperature calibration. Format :cal:prot:card1:step0 parameter = cold calibration temperature (°c) description :step0 performs temperature sensor calibration of the model 7706. The card must be allowed to cool d...

  • Page 47

    43 remote error reporting error queue as with other model 2700 errors, any calibration error will be reported in the bus error queue. You can read this queue by using the :syst:err? Query. The model 2700 will respond with the appropriate error message, as summarized in table 9 . Status byte eav (err...

  • Page 48

    44 model 7706 module generating an srq on error to program the instrument to generate an ieee-488 bus srq when an error occurs, send the following command: *sre 4. This command will enable srq when the eav bit is set. You can then read the status byte and error queue as outlined above to check for e...

  • Page 49: Replaceable Parts

    45 replaceable parts replaceable parts introduction this section contains replacement parts information and component layout drawings for the model 7706. Parts lists both electrical and mechanical parts for the model 2700 are listed in several tables on the following pages. Ordering information to p...

  • Page 50

    46 model 7706 module cr29,cr30,cr40,cr41 dual high speed diode rf-147 cr31,32,34,36,38,1,33,35,37,39 diode, dual switching, bav99l rf-82 cr51-cr54 diode, dual switching, bav99l rf-82 cr7-cr22 diode, dual common anode baw56lt2 rf-98 j1 conn, rt angle dual row recept cs-1065-1 j2 conn, berg cs-339 k1-...

  • Page 51

    47 replaceable parts u24,u34,u11,u26,u29,u7,u8,u9 ic, octal d flip flop ic-1353 u25 ic, -5v voltage regulator ic-1171 u3 ic, 8 stage shift/store, mc14094bd ic-772 u30,u31 ic, octal buffer ic-1252 u32 ic, 2.5v, cascadable serial eeprom lsi-212 u33 ic, 8-bit microcontroller lsi-242 u4,u5 ic, schmitt-t...

  • Page 52

    48 model 7706 module figure 26 component layout (side-04).

  • Page 53

    49 replaceable parts figure 27 component layout (side-01).

  • Page 54

    General 20 channels: 20 channels of 2-pole relay input. All channels configurable to 4-pole. Relay type: latching electromechanical. Actuation time: capabilities channels 1–20: multiplex one of 20 2-pole or one of 10 4-pole sig- nals into dmm. Channels 21–25 are referenced to chassis ground. Channel...

  • Page 55

    Specifications are subject to change without notice. All keithley trademarks and trade names are the property of keithley instruments, inc. All other trademarks and trade names are the property of their respective companies. Keithley instruments, inc. 28775 aurora road • cleveland, ohio 44139 • 440-...