Tektronix Keithley 7706 Manual de usuario

Keithley Instruments

28775 Aurora Road

Cleveland, Ohio 44139

1-800-935-5595

tek.com/keithley

Model 7706 Multiplexer Module

Instructions for use with DAQ6510

077145000 / June 2018

*P077145000* 1

Introduction

The 7706 20-Channel Differential Multiplexer switching module offers 20 channels of 2-pole or 10 channels of

4-pole multiplexer switching with automatic CJC. It also offers two analog output channels, 16 digital outputs,

and one event counter/totalizer. You can use the event counter/totalizer to monitor and control system

components while making mixed signal measurements. The 7706 is ideal for RTD, thermistor, and

thermocouple temperature applications.

Figure 1: 7706 Multiplexer Module

Item shipped may vary from model pictured here.

Model 7706 Multiplexer Module Instructions for use with DAQ6510

077145000 / June 2018

The 7706 includes the following features:

▪Twenty channels of analog input with 300 V,1 A capacity; 60 W, 125 VA maximum

▪Sixteen channels of digital output

▪One event counter/totalizer, which you can use to monitor and control system components and actions,

such as fixtures, limit switches, pass/fail indicators, external voltage sources, loads, door closures, and

revolutions

▪Two analog outputs (±12 V at 5 mA with 16-bit programmability)

▪Two-wire or four-wire resistance measurements (automatically pairs switches for four-wire measurements)

▪Built-in automatic cold junction reference (CJC)

▪Screw terminal connections

The 7706 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 7706

Multiplexer Card User's Manual, Keithley Instruments document PA-719.

Wiring procedure

Use the following procedure to make connections to the 7706 module. Make all connections using correct wire

size (up to 22 AWG).

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 40). 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.

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.

Do not exceed the maximum specifications for the 7706 module. Refer to the specifications

provided in the data sheet. Failure to recognize and observe normal safety precautions could

result in personal injury or death.

The 7706 module provides connections for both hazardous-voltage and low-voltage circuits.

Make sure to install and maintain double insulation between the hazardous-voltage and

low-voltage wiring using supplementary insulation as required. See the "Wire dressing–fully

wired module" figure in this document for more information. Failure to insulate wiring

properly could result in personal injury or death.

Model 7706 Multiplexer Module Instructions for use with DAQ6510

077145000 / June 2018

Equipment needed:

▪Flat-blade screwdriver

▪Cable ties

To wire the 7706:

1. Make sure all power is discharged from the 7706 module.

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

Figure 2: Screw terminal access

3. Using the flat-blade screwdriver, loosen the terminal screws and install the wires as needed. The channel

designations for the screw terminals are shown in the following figures.

Model 7706 Multiplexer Module Instructions for use with DAQ6510

077145000 / June 2018

Figure 3: Channel designations for analog inputs

Model 7706 Multiplexer Module Instructions for use with DAQ6510

077145000 / June 2018

Figure 4: 7706 screw terminal output, source, and sense channel designations

Model 7706 Multiplexer Module Instructions for use with DAQ6510

077145000 / June 2018

4. Route the wire along the wire path and secure with cable ties as shown in the following figure.

Figure 5: Wire dressing - fully wired module

5. Fill in a copy of the Connection log (on page 22).

6. Attach the screw terminal access cover.

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

Model 7706 Multiplexer Module Instructions for use with DAQ6510

077145000 / June 2018

7706 simplified schematic

The 7706 has channels that are grouped into two banks of ten channels (twenty channels total). Backplane

isolation is provided for each bank. Each bank also 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 and LO, providing fully isolated inputs.

Connections to DMM functions are provided through the module backplane connector for the INPUT

connections and SENSE (4-wire resistance) connections.

Channels 21 to 22 (digital output), 23 to 24 (analog output), and 25 (totalizer) are controlled either using the

remote interface or from the front panel. The grounds for these channels are non-isolated. Detailed information

for each channel is provided later in this document.

Channel 26 (2-wire or 4-wire configuration), channel 27 (sense isolation), and channel 28 (input isolation) are

normally automatically configured by the DAQ6510. However, if the module is not to be connected to the

internal DMM, you can control the channels independently. Note that in the schematic, channels 26, 27, and 28

refer to the designations used for control and not actual available channels. For more information, refer to the

instrument reference manual section "Multiple channel operation."

Connect 4-wire sense leads using channels 11 to 20. When the instrument is configured for 4-wire

measurements (including 4-wire resistance, RTD temperature, ratio, and channel average), the channels are

paired as follows:

▪CH1 and CH11

▪CH2 and CH12

▪CH3 and CH13

▪CH4 and CH14

▪CH5 and CH15

▪CH6 and CH16

▪CH7 and CH17

▪CH8 and CH18

▪CH9 and CH19

▪CH10 and CH20

Although the 7706 relays are latching (the relays hold their state even after power has been

removed), all relay states are set to open a few seconds after either a power cycle or a reset

command is issued.

Model 7706 Multiplexer Module Instructions for use with DAQ6510

077145000 / June 2018

Figure 6: 7706 simplified schematic

Model 7706 Multiplexer Module Instructions for use with DAQ6510

077145000 / June 2018

Channel usage

When using remote communications to send commands, be aware of the following channel usage.

Channels

Description

1 to 20

Measurements such as voltage, resistance, temperature, frequency, and period

21 to 22

Eight-bit digital outputs

23 to 24

Sixteen-bit analog outputs (DAC)

Totalizer

Two-pole or four-pole selection relay; closing channel 26 makes a four-pole measurement

Sense terminals to backplane isolation

Input terminals to backplane isolation

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.

If you have a Keithley Instruments Model 2700, 2701, or 2750 instrument, you can use your existing

switching module in the DAQ6510. Follow the instructions in your original equipment documentation

to remove the module from the instrument, then use the following instructions to install it in the

DAQ6510. You do not need to remove wiring to the module.

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 DAQ6510 Data Acquisition and Multimeter

System 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 DAQ6510 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.

If a card slot is unused, you must install slot covers to prevent personal contact with high

voltage circuits. Failure to install slot covers could result in personal exposure to hazardous

voltages, which could cause personal injury or death if contacted.

Model 7706 Multiplexer Module Instructions for use with DAQ6510

077145000 / June 2018

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:

▪Medium flat-blade screwdriver

▪Medium Phillips screwdriver

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. Position the DAQ6510 so you are facing the rear panel.

5. Use the screwdriver to remove the slot cover screws and the cover plate. Retain the plate and screws for

future use.

6. With the top cover of the switching module facing up, slide the switching module into the slot.

7. Press the switching module in firmly to make sure the switching module connector is connected to the

DAQ6510 connector.

8. Use the screwdriver to tighten the two mounting screws to secure the switching module to the mainframe.

Do not overtighten.

9. Reconnect the power cord and any other cables.

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. Additionally, if you drop your switching module, it is possible

for some relays to latch closed.

To open all channel relays, go to the CHANNEL swipe screen. Select Open All.

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 DAQ6510 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.

If a card slot is unused, you must install slot covers to prevent personal contact with high

voltage circuits. Failure to install slot covers could result in personal exposure to hazardous

voltages, which could cause personal injury or death if contacted.

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