Tektronix 7710 User manual

Keithley Instruments

28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595

tek.com/keithley

Model 7710 Multiplexer Module

Instructions for use with DAQ6510

077145100 / April 2018 *P077145100* 1

Introduction

The 7710 20-channel Solid-state Differential Multiplexer with Automatic CJC module offers 20 channels of
2-pole or 10 channels of 4-pole relay input that can be configured as two independent banks of multiplexers.
The relays are solid state, providing long life and low maintenance. It is ideal for long-term data logging
applications and for demanding high-speed applications.

Figure 1: 7710 20-Channel Differential Multiplexer Module

Item shipped may vary from model pictured here.

Model 7710 Multiplexer Module Instructions for use with DAQ6510

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The 7710 includes the following features:

▪ Fast-actuating, long-life solid-state relays
▪ DC and AC voltage measurement
▪ Two-wire or four-wire resistance measurements (automatically pairs relays for four-wire

measurements—n + 10)

▪ Temperature applications (RTD, thermistor, thermocouple)
▪ Built-in cold junction reference for TC temperature
▪ Screw terminal connections

The 7710 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 7710
Multiplexer Card User's Guide, Keithley Instruments PA-847.

Connections

Screw terminals on the switching module are provided for connection to device under test (DUT) and external
circuitry. The 7710 uses quick-disconnect terminal blocks. You can make connections to a terminal block when
it is disconnected from the module. These terminal blocks are rated for 25 connects and disconnects.

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.

The following information describes how to make connections to the switching module and define the channel
designations. A connection log is provided that you can use to record your connections.

Model 7710 Multiplexer Module Instructions for use with DAQ6510

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Wiring procedure

Use the following procedure to make connections to the 7710 module. Make all connections using the correct
wire size (up to 20 AWG). For maximum system performance, all measurement cables should be less than
three meters.

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. Failure to recognize and observe normal safety precautions could result in
personal injury or death.

Equipment needed:

▪ Flat-blade screwdriver
▪ Cable ties

To wire the 7710 module:

1. Make sure all power is discharged from the 7710 module.

2. Using a screwdriver, turn the access screw to unlock and open the cover.

Figure 2: Screw terminal access

3. If needed, remove the appropriate quick-disconnect terminal block from the module.
a. Place a flat-head screwdriver under the connector and gently push up to loosen it, as shown in the

following figure.

b. Use needle-nose pliers to pull the connector straight up.

Model 7710 Multiplexer Module Instructions for use with DAQ6510

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Do not rock the connector from side to side. Damage to the pins could result.

Figure 3: Proper procedure to remove terminal blocks

4. Using a small flat-blade screwdriver, loosen the terminal screws and install the wires as needed. The
following figure shows the connections, including the connections to source and sense.

Figure 4: Screw terminal channel designations

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5. Plug the terminal block into the module.

6. Route wire along the wire path and secure with cable ties as shown. The following figure shows
connections to channels 1 and 2.

Figure 5: Wire dressing

7. Fill in a copy of the Connection log (on page 9).

8. Close the screw terminal access cover.

9. Using a screwdriver, press in the access screw and turn to lock the cover.

Model 7710 Multiplexer Module Instructions for use with DAQ6510

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Module configuration

The following figure shows a simplified schematic diagram of the 7710 module. As shown, the 7710 has
channels that are grouped into two banks of 10 channels (20 channels total). Backplane isolation is provided for
each bank. Each bank includes separate cold junction reference points. The first bank contains channels 1 to
10, while the second bank contains channels 11 to 20. Each channel of the 20-channel multiplexer module is
wired with separate inputs for HI/LO providing fully isolated inputs.

Connections to DMM functions are provided through the module backplane connector.
Channels 21, 22, and 23 are configured automatically by the DAQ6510 when using system channel operation.
When using system channel operation for 4-wire measurements (including 4-wire ohms, RTD temperature,

Ratio, and Channel Average), the channels are paired as follows:

CH1 and CH11

CH6 and CH16

CH2 and CH12

CH7 and CH17

CH3 and CH13

CH8 and CH18

CH4 and CH14

CH9 and CH19

CH5 and CH15

CH10 and CH20

Channels 21 to 23 in this schematic refer to designations used for control and not actual available
channels. For more information, refer to the instrument reference manual.

Figure 6: 7710 simplified schematic

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Typical connections

The following examples show typical wiring connections for the following types of measurements:

▪ Thermocouple
▪ Two-wire resistance and thermistor
▪ Four-wire resistance and RTD
▪ DC or AC voltage

Thermocouple connections

Figure 7: Thermocouple connections

Two-wire resistance and thermistor connections

Figure 8: Two-wire resistance and thermistor connections

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Four-wire resistance and RTD connections

Figure 9: Four-wire resistance and RTD connections

DC or AC voltage connections

Figure 10: Voltage connections - DC or AC

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Connection log

You can use the table to record your connection information.

Channel

Color

Description

Card Source
H L

Card 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