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Tektronix KEITHLEY 7701 Instructions For Use Manual
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Tektronix KEITHLEY 7701 Instructions For Use Manual

Tektronix KEITHLEY 7701 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 7701 32-Channel High-Speed Differential Multiplexer Module offers 32 channels of 2-pole or 16 channels
of 4-pole multiplexer switching. Its 32 channels can be configured for commonside 4-wire ohms measurements.
The channels can also be configured as two independent banks of multiplexers. The 7701 is ideal for RTD or
thermistor temperature applications.
Item shipped may vary from model pictured here.
The 7701 includes the following features:
▪
Configurable for 32 channels of differential measurements, with up to 16 channels of 4-pole
measurements
▪
Two female D-shell connectors are standard for secure hook-up and quick teardown
▪
150 V, 1 A capacity for voltage channels; 60 W, 125 VA
▪
Relay closures stored in onboard memory
▪
Screw terminal jumpers allow user-configurable DMM connections
The 7701 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 7701 User's
Guide, Keithley Instruments document number PA-769.
077144700 / June 2018
Figure 1: 7701 32-Channel Differential Multiplexer Module
*P077144700*
Model 7701 Multiplexer Module
Instructions for use with DAQ6510
1

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Summary of Contents for Tektronix KEITHLEY 7701

  • Page 1 Model 7701 Multiplexer Module Keithley Instruments Instructions for use with DAQ6510 28775 Aurora Road Cleveland, Ohio 44139 1-800-935-5595 tek.com/keithley Introduction The 7701 32-Channel High-Speed Differential Multiplexer Module offers 32 channels of 2-pole or 16 channels of 4-pole multiplexer switching. Its 32 channels can be configured for commonside 4-wire ohms measurements. The channels can also be configured as two independent banks of multiplexers.
  • Page 2 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Connections and wiring Connection and wiring procedures in this document are intended for use by qualified personnel only, as described by the types of product users in the Safety precautions page 25). 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.
  • Page 3 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Figure 2: 7701 screw terminals 077144700 / June 2018...
  • Page 4 Model 7701 Multiplexer Module Instructions for use with DAQ6510 4. Install the four supplied #22 AWG jumpers in the screw terminals as shown in the following figure. Position the jumpers to allow clearance for the top cover. Make sure the jumper wires do not contact each other or other electrical conductors.
  • Page 5 Model 7701 Multiplexer Module Instructions for use with DAQ6510 50-pin D-sub connector 7701 7701 7701 7701 7701 Terminal Terminal Terminal Terminal Terminal Ch 1 Hi Ch 16 Hi Ch 6 Lo Ch 21 Lo Ch 12 Hi Ch 2 Lo Ch 17 Lo Ch 8 Hi Ch 23 Hi...
  • Page 6 Model 7701 Multiplexer Module Instructions for use with DAQ6510 25-pin D-sub connector 7701 7701 7701 7701 Terminal Terminal Terminal Terminal Ch 25 Hi Ch 31 Hi Ch 25 Lo Ch 31 Lo Ch 26 Hi Ch 32 Hi Ch 26 Lo Ch 32 Lo Ch 27 Hi MUX 2 Hi...
  • Page 7 Model 7701 Multiplexer Module Instructions for use with DAQ6510 IDC ribbon cable connections Connect an appropriate length of 50-conductor IDC ribbon cable to a 50-pin plug D-sub IDC connector, and connect an appropriate length of 25-conductor IDC ribbon cable to a 25-pin plug D-sub IDC connector. The following table and figure provide terminal identification for the 50-pin ribbon cable connections.
  • Page 8 Model 7701 Multiplexer Module Instructions for use with DAQ6510 The following table and figure provide terminal identification for the 25-pin ribbon cable connections. Terminal identification for 25-conductor IDC ribbon cable and 7701 DB-25 connector Ribbon Cable*: 7701 DB-25 Ribbon Cable*: 7701 DB-25 Conductor...
  • Page 9 Model 7701 Multiplexer Module Instructions for use with DAQ6510 7789 Solder Cup Adapter Kit cable connections Make all connections to D-sub plug solder cup connectors using the correct wire size up to 20 AWG. Terminal identification for the 50-pin D-sub connector and the 25-pin D-sub connector is provided in the tables in ribbon cable connections (on page 7).
  • Page 10 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Typical connections The following examples show typical wiring connections for the following types of measurements: ▪ Two-wire resistance and thermistor ▪ Four-wire resistance and RTD ▪ DC or AC voltage Figure 7: 2-wire resistance and thermistor connections Figure 8: 4-wire resistance and RTD connections 077144700 / June 2018...
  • Page 11 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Figure 9: Voltage connections - DC or AC Connection log You can use the next table to record your connection information. 077144700 / June 2018...
  • Page 12 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Connection log for the 7701 Channel Color Description Description Color Channel MUX 1 MUX 2 CH17 CH18 CH19 CH20 CH21 CH22 CH23 CH24 CH25 CH10 CH26 CH11 CH27 CH12 CH28 CH13 CH29 CH14 CH30...
  • Page 13 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Installation Before operating an instrument with a 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. 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 14 Model 7701 Multiplexer Module Instructions for use with DAQ6510 To install a switching module into the DAQ6510: 1. Turn off the DAQ6510. 2. Disconnect the power cord from the power source. 3. Disconnect the power cord and any other cables that are connected to the rear panel. 4.
  • Page 15 Model 7701 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: ▪...
  • Page 16 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Module configuration schematic The following figure shows a simplified schematic diagram of the 7701 module. The 7701 has input channels that are grouped into two banks of 16 channels (32 channels total). A backplane isolation relay is provided for each bank.
  • Page 17 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Figure 10: 7701 simplified schematic The 7701 is rated for low-voltage applications. When connecting the 7701 to the internal DMM using the screw terminals, all other modules in the mainframe must be derated to 150 VDC or 150 V (212 V ) for AC waveforms.
  • Page 18 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Channels 33, 34, and 35 can be individually controlled. For more information, refer to "Multiple channel operation" in the instrument reference manual. Applications The following applications use multiple channel operation, where each channel is controlled independently.
  • Page 19 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Figure 11: Commonside 4-wire test system (multiple-channel operation) 077144700 / June 2018...
  • Page 20 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Jumper installation for 4-wire commonside ohms application Jumper installation for the commonside 4-wire resistance test system is shown in the following figure. In the following figure: ▪ Jumper A: Connects the DUT commonside bus (P12) to DMM Input HI. ▪...
  • Page 21 Model 7701 Multiplexer Module Instructions for use with DAQ6510 Using TSP commands channel.open("allslots") channel.setdmm("slot1", dmm.ATTR_MEAS_FUNCTION, dmm.FUNC_4W_RESISTANCE) channel.setcommonside("slot1", channel.ON) channel.close("101") print(dmm.measure.read()) Repeat closing and reading channels for each DUT (channels 102 to 131). channel.close("132") print(dmm.measure.read()) printbuffer(1, defbuffer1.n, defbuffer1) channel.open("allslots") Biasing and measuring DUTs (dual multiplexing) Multiple channel operation is required for the following application.
  • Page 22 Model 7701 Multiplexer Module Instructions for use with DAQ6510 The figure after the table shows the connections for this application. The external source is connected to the Multiplexer 2 terminals of the switching module, and a DUT is connected to channels 1 to 16. Channels 17 to 32 are used to connect external power to each DUT.
  • Page 23 Model 7701 Multiplexer Module Instructions for use with DAQ6510 In the following figure, channels 1 and 17 are closed to test DUT 1. The test for the other DUTs is similar except that different source and measure channels are closed. Figure 14: Biasing and measuring DUT test system 077144700 / June 2018...
  • Page 24 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 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.