Tektronix KEITHLEY 7710 Manual de usuario

Keithley Instruments

28775 Aurora Road

Cleveland, Ohio 44139

1-800-833-9200

tek.com/keithley

Model 7710 Multiplexer Module

Instructions for use with the 2750

PA-847 Rev. C June 2023

*PPA-847C*

Introduction

The 7710 20-channel Solid-state Differential Multiplexer with Automatic Cold Junction Compensation (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.

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)

Temperature applications (RTD, thermistor, thermocouple)

Built-in cold junction reference for thermocouple temperature

Screw terminal connections

Model 7710 Multiplexer Module Instructions for use with the 2750

2 PA-847 Rev. C June 2023

The Model 7710 will operate properly when installed in one of the following instruments:

Model 2700 equipped with B05 (or later) firmware

Model 2701 equipped with A01 (or later) firmware

Model 2750 equipped with A04 (or later) firmware

If you are using this switching module with the DAQ6510, see the Model 7710 Multiplexer Card for use

with the DAQ6510 User's Guide, document number 0771451xx.

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, as described by the types of product users in the Safety precautions (on page

19). 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.

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. Add supplementary insulation around the harness for voltages above 42 VPEAK.

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.

Model 7710 Multiplexer Module Instructions for use with the 2750

PA-847 Rev. C June 2023 3

Equipment needed:

Flat-blade screwdriver

Needle-nose pliers

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, as shown in the following figure.

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.

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

Model 7710 Multiplexer Module Instructions for use with the 2750

4 PA-847 Rev. C June 2023

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

Model 7710 Multiplexer Module Instructions for use with the 2750

PA-847 Rev. C June 2023 5

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. See Connection log (on page 8).

8. Close the screw terminal access cover.

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

Module configuration

The following figure shows a simplified schematic 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 instrument when using system channel operation.

Model 7710 Multiplexer Module Instructions for use with the 2750

6 PA-847 Rev. C June 2023

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

Channels 21, 22, and 23 are configured automatically by the Model 2750 when using system channel operation.

By using multiple channel operation, they can be manually configured.

For example, assume a 7710 module is installed in slot 1 of the mainframe and an external source is connected to

Card Source input. To connect the source to channel 11 only, multiple channel operation must be used. For

example:

ROUT:OPEN:ALL 'Open all channels.

ROUT:MULT:CLOS (@111,123) 'Close channels 11 and 23.

Model 7710 Multiplexer Module Instructions for use with the 2750

PA-847 Rev. C June 2023 7

For this command sequence, the digital multimeter (DMM) of the 2750 is electrically isolated from the

test circuit.

Refer to the Model 2750 Reference Manual for detail on multiple channel operation.

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

Figure 7: Thermocouple connections

Figure 8: Two-wire resistance and thermistor connections

Model 7710 Multiplexer Module Instructions for use with the 2750

8 PA-847 Rev. C June 2023

Figure 9: Four-wire resistance and RTD connections

Figure 10: DC or AC voltage connections

Connection log

You can use the following table to record your connection information.

Model 7710 Multiplexer Module Instructions for use with the 2750

PA-847 Rev. C June 2023 9

Connection log for the 7710

Channel Color Description

Card Source

Card Sense

CH1

CH2

CH3

CH4

CH5

CH6

CH7

CH8

CH9

CH10

CH11

CH12

CH13

CH14

CH15

CH16

CH17

CH18

CH19

CH20

Model 7710 Multiplexer Module Instructions for use with the 2750

10 PA-847 Rev. C June 2023

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.

For inexperienced users, it is recommended that you do not connect a device under test (DUT) and

external circuitry to the switching module. This allows you to exercise close and open operations

without the dangers associated with live test circuits. You can also set up pseudocards to experiment

with switching. Refer to “Pseudocards” in the Model 2750 Reference Manual for information on setting

up pseudocards.

To prevent electric shock that could result in injury or death, never handle a switching module

that has power applied to it. Before installing or removing a switching module, make sure the

instrument is turned off and disconnected from line power. If the switching module is

connected to a DUT, make sure power is removed from all external circuitry.

Slot covers must be installed on unused slots to prevent personal contact with high-voltage

circuits. Failure to recognize and observe standard safety precautions could result in personal

injury or death due to electric shock.

Before installing or removing a switching 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 Model 7710 EPROM data.

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