Tektronix KEITHLEY 7700 Instructions For Use Manual
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Tektronix KEITHLEY 7700 Instructions For Use Manual

Tektronix KEITHLEY 7700 Instructions For Use Manual

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Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595
tek.com/keithley
Introduction
The 7700 20-Channel Differential Multiplexer Plug-In Module offers 20 channels of 2-pole or 10 channels of
4-pole multiplexer switching that can be configured as two independent banks of multiplexers. There are two
additional protected channels for current measurements. Automatic cold junction compensation (CJC) is
provided so that no other accessories are required to make thermocouple temperature measurements. In
addition, the 7700 contains latching electromechanical relays that enable signal bandwidths of up to 50 MHz.
The 7700 is ideal for RTD, thermistor, and thermocouple temperature applications.
Item shipped may vary from model pictured here.
The 7700 includes the following features:
2-wire or 4-wire resistance measurements (automatically pairs switches for 4-wire measurements —
n + 10)
Screw terminal connections
Built-in cold junction reference
Latching type relays (relays hold their position after power is removed)
Two protected channels for current measurements (external shunts not required)
The 7700 can be used with the DAQ6510 Data Acquisition and Multimeter System.
If you are using this switching module with the 2700, 2701, or 2750, please see Model 7700, 7702,
and 7703 Multiplexer Modules Connection and Wiring Information, Keithley Instruments document
PA-695.
077144300 / April 2018
Figure 1: 7700 20-Channel Differential Multiplexer Module
*077144300 *
Model 7700 Multiplexer Module
Instructions for use with DAQ6510
1

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Summary of Contents for Tektronix KEITHLEY 7700

  • Page 1 Model 7700 Multiplexer Module Instructions for use with DAQ6510 Keithley Instruments 28775 Aurora Road Cleveland, Ohio 44139 1-800-935-5595 tek.com/keithley Introduction The 7700 20-Channel Differential Multiplexer Plug-In Module offers 20 channels of 2-pole or 10 channels of 4-pole multiplexer switching that can be configured as two independent banks of multiplexers. There are two additional protected channels for current measurements.

  • Page 2: Wiring Procedure

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 Connections Connection and wiring procedures in this document are intended for use by qualified personnel only. Do not perform these procedures unless qualified to do so. Failure to recognize and observe normal safety precautions could result in personal injury or death. Do not exceed the maximum specifications for the 7700.
  • Page 3 Model 7700 Multiplexer Module Instructions for use with DAQ6510 Equipment needed: Small flat-blade screwdriver  Cable ties  To make connections to the 7700 module: 1. Make sure all power is discharged from the 7700 module. 2. Use a screwdriver to turn the access screw to unlock and open the cover. Figure 2: Screw terminal access 3.
  • Page 4 Model 7700 Multiplexer Module Instructions for use with DAQ6510 4. Route wire along the wire path and secure with cable tie as shown. The next figure also shows connections to channels 1 and 2. Figure 4: Wire dressing 5. Record the connections in the Connection log (on page 5).

  • Page 5: Connection Log

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 Connection log You can use the next table to record your connection information. Connection log for the 7700 Channel Color Description AMPS COM INPUT SENSE CH10 CH11 CH12 077144300 / April 2018...
  • Page 6 Model 7700 Multiplexer Module Instructions for use with DAQ6510 Channel Color Description CH13 CH14 CH15 CH16 CH17 CH18 CH19 CH20 AMPS21 AMPS22 077144300 / April 2018...

  • Page 7: Installation

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 Remove a switching module Before you remove a switching module, or begin any testing, make sure that all of the relays are open. Since some relays may be latched closed, you must open all of the relays before removing the switching module to make connections.
  • Page 8 Model 7700 Multiplexer Module Instructions for use with DAQ6510 To use the switching operations, a switching module must be installed in the DAQ6510. If you are installing two switching modules, it is easier to install one switching module into Slot 2 first, then install the second switching module into Slot 1.

  • Page 9: Operation

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 Operation Before installing or removing a 7700 module, make sure the instrument power is turned off and disconnected from line power. Failure to comply may result in incorrect operation and loss of data in the memory of the module. To prevent overheating or damage to the 7700 switching module relays, never exceed the following maximum signal levels between any two inputs or chassis: •...
  • Page 10 Model 7700 Multiplexer Module Instructions for use with DAQ6510 Figure 5: 7700 simplified schematic 077144300 / April 2018...

  • Page 11: Recommended Test Equipment

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 Calibration The following procedure calibrates the temperature sensors on the modules. Do not attempt to perform this procedure unless qualified to do so. Failure to recognize and observe normal safety precautions could result in personal injury or death. Recommended test equipment To calibrate the module, you need the following equipment.

  • Page 12: Performance Verification

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 To calibrate temperature: 1. Accurately measure and record the cold temperature of the module surface at the center of the module with the digital thermometer. 2. Unlock calibration by sending: :CALibration:PROTected:CODE "KI006510" 3.

  • Page 13: Environmental Conditions

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 Make sure that you perform the verification tests using the following conditions: Under the proper environmental conditions.  After the specified warm-up period.  With connections made to the correct input terminals. ...
  • Page 14 Model 7700 Multiplexer Module Instructions for use with DAQ6510 Recommended test equipment The table below summarizes recommended verification equipment. You can use alternate equipment if that equipment has specifications if that equipment has specifications that meet or exceed those listed below. Be aware that calibrator uncertainty adds to the uncertainty of each measurement.

  • Page 15: Performance Verification Procedures

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 Performance verification procedures The following procedures describe how to check one channel (CH1) or one channel pair (CH1 and CH11) of the module. To check other channels or channel pairs, modify the procedures by connecting the verification equipment to the appropriate channel or channel pair.
  • Page 16 Model 7700 Multiplexer Module Instructions for use with DAQ6510 To verify DC voltage accuracy: 1. Connect the CH1 H and L INPUT terminals to the DC voltage calibrator as shown in the next figure. Use shielded, low-thermal connections when testing the 100 mV and 1 V ranges to avoid errors caused by noise or thermal effects.

  • Page 17: Verifying Ac Voltage

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 Verifying AC voltage To check AC voltage accuracy, apply accurate AC voltages at specific frequencies from the AC voltage calibrator to the module inputs. Verify that the displayed readings fall within specified ranges. Do not exceed 300 V between the INPUT H and L terminals or between adjacent channels, or 8 ×...

  • Page 18: Verifying Resistance

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 1 kHz reading limits 50 kHz reading limits ACV range Applied AC voltage (1 year, 18 °C to 28 °C) (1 year, 18 °C to 28 °C) 100 mV 100.0000 mV 99.910 to 100.090 mV 99.830 to 100.170 mV 1.000000 V...
  • Page 19 Model 7700 Multiplexer Module Instructions for use with DAQ6510 12. For the 100 Ω range, select the MENU key, select Channel Settings, and set Offset Compensation to On. 13. Recalculate reading limits based on actual calibrator resistance values. 14. Source the nominal full-scale resistance values for the 1 Ω to 100 MΩ ranges listed in the table below. Verify that the readings are within calculated limits.

  • Page 20: Verifying Temperature

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 Verifying temperature Thermocouple, thermistor, and RTD temperature readings are derived from DC volts and resistance measurements, respectively. For that reason, it is not necessary to independently verify the accuracy of temperature measurements. If the DC volts and resistance functions meet or exceed specifications, temperature function accuracy is automatically verified.

  • Page 21: Rtd Temperature

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 10. Configure the channel for °C units, type K temperature sensor, and internal reference junction as follows: a. Press the MENU key. b. Select Channel Settings. c. Set the Transducer to TC. d.

  • Page 22: Verifying Frequency

    Model 7700 Multiplexer Module Instructions for use with DAQ6510 11. Source each of the voltages in the table below to verify that the temperature readings are within limits. Make sure to select the appropriate thermocouple type for each group of readings. 12.
  • Page 23 Model 7700 Multiplexer Module Instructions for use with DAQ6510 Verifying ratio and average Follow the procedure below to verify ratio and average. Do not exceed 300 VDC between plug-in module INPUT H and L terminals or between any adjacent channels. Failure to observe this precaution can cause instrument damage. To verify ratio and average: 1.

  • Page 24: Factory Service

    299.983 V to 300.017 V Factory service To return the switching module to Keithley Instruments for repair: Call the Repair Department at 1-800-833-9200 or send an email to RMAREQUEST@tektronix.com for a  Return Material Authorization (RMA) number. Carefully pack the instrument in the original packing carton.

  • Page 25: Safety Precautions

    Safety precautions The following safety precautions should be observed before using this product and any associated instrumentation. Although some instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardous conditions may be present. This product is intended for use by personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury.
  • Page 26 For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be impaired. Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.

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