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Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595
tek.com/keithley
Introduction
The 7702 40-Channel Differential Multiplexer Module offers 40 channels of 2-pole or 20 channels of 4-pole
multiplexer switching that can be configured as two independent banks of multiplexers. The 7702 provides two
additional protected channels for current measurements. It is ideal for RTD, thermistor, and thermocouple
temperature applications.
Item shipped may vary from model pictured here.
077144400 / April 2018
Figure 1: Model 7702 40-Channel Differential Multiplexer Module
*P077144400*
Model 7702 Multiplexer Module
Instructions for use with DAQ6510
1
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Summary of Contents for Tektronix Keithley 7702
- Page 1 Model 7702 Multiplexer Module Keithley Instruments Instructions for use with DAQ6510 28775 Aurora Road Cleveland, Ohio 44139 1-800-935-5595 tek.com/keithley Introduction The 7702 40-Channel Differential Multiplexer Module offers 40 channels of 2-pole or 20 channels of 4-pole multiplexer switching that can be configured as two independent banks of multiplexers. The 7702 provides two additional protected channels for current measurements.
- Page 2 Model 7702 Multiplexer Module Instructions for use with DAQ6510 The 7702 includes the following features: ▪ Two-wire or four-wire resistance measurements (automatically pairs switches for four-wire measurements — n + 20) ▪ Two protected channels for current measurements (external shunts not required) ▪...
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Page 3: Wiring Procedure
Model 7702 Multiplexer Module Instructions for use with DAQ6510 Wiring procedure Use the following procedure to make connections to the 7702 switching module. Make all connections using the correct wire size (up to 20 AWG). All wiring must be rated for the maximum voltage in the system. For example, if 1000 V is applied to the front terminals of the instrument, the switching module wiring must be rated for 1000 V. - Page 4 Model 7702 Multiplexer Module Instructions for use with DAQ6510 3. Using a small flat-blade screwdriver, loosen the terminal screws and install wires as needed. The following figure shows the connections, including the connections to Input and Sense. Figure 3: Screw terminal channel designations 077144400 / April 2018...
- Page 5 Model 7702 Multiplexer Module Instructions for use with DAQ6510 4. Route wire along the wire path and secure with cable ties as shown. Figure 4: Wire dressing 5. Fill in a copy of the connection log (see Connection log (on page 7)). 6.
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Page 6: Schematic Diagram
Model 7702 Multiplexer Module Instructions for use with DAQ6510 Schematic diagram The simplified schematic diagram of the 7702 is shown in the following figure. Channels 1 to 40 are used for all measurements except current. Channels 41 and 42 are used for current only. There are two backplane relays (channels 44 and 45) to connect the input channels to the backplane of the instrument. - Page 7 Model 7702 Multiplexer Module Instructions for use with DAQ6510 Figure 5: 7702 simplified schematic 077144400 / April 2018...
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Page 8: Connection Log
Model 7702 Multiplexer Module Instructions for use with DAQ6510 Connection log You can use the table to record your connection information. Channel Color Description Description Color Channel INPUT SENSE CH21 CH22 CH23 CH24 CH25 CH26 CH27 CH28 CH29 CH30 CH10 CH31 CH11 CH32... -
Page 9: Installation
Model 7702 Multiplexer Module Instructions for use with DAQ6510 Installation Before operating an instrument with an accessory switching module, verify that the switching module is properly installed and the mounting screws are tightly fastened. If the mounting screws are not properly connected, an electrical shock hazard may be present. To use the switching operations, a switching module must be installed in the DAQ6510. - Page 10 Model 7702 Multiplexer Module Instructions for use with DAQ6510 Before installing or removing a switching module, make sure the DAQ6510 power is turned off and disconnected from line power. Failure to comply may result in incorrect operation and loss of data in the memory. Required equipment: ▪...
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Page 11: Operation
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 12: 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 13 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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