Tektronix Keithley 7709 User manual

Keithley Instruments

28775 Aurora Road

Cleveland, Ohio 44139

1-800-935-5595

tek.com/keithley

Model 7709 6 × 8 Matrix Module

Instructions for use with DAQ6510

077147500 / June 2018 *P077147500*

Introduction

The 7709 switching module is a two-pole, 6 × 8 matrix switching module. It can connect any combination of six

differential channels of instrumentation to any combination of eight differential device-under-test channels. The

instrumentation can be AC and DC sources, such as internal or external meters or oscilloscopes. This matrix

configuration allows wide flexibility for complex test systems.

Figure 1: Model 7709

Item shipped may vary from model pictured here.

The Model 7709 is a 2-pole, 6 × 8 matrix card with the following features:

▪Automatic 2-wire or 4-wire connection to DMM

▪6 row × 8 column matrix

▪Expandable to larger switch configurations by daisy-chaining or cascading multiple modules

▪Two female D-sub connectors are standard for secure hook-up and quick teardown

▪300 V, 1 A capacity

▪Relay closures stored in onboard memory

If you are using this switching module with the 2700, 2701, or 2750, please see Model 7709

Multiplexer Card User's Guide, Keithley Instruments PA-771.

Model 7709 6 × 8 Matrix Module Instructions for use with DAQ6510

077147500 / June 2018

Schematic information

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 figure shows a simplified diagram of the 7709 switching module. The matrix consists of 48

crosspoints. Each crosspoint channel is a 2-pole switch that, when closed, connects a row to a column. For

example, closing channel 43 connects row 6 to column 3.

Two switches (channels 49 and 50) are used to connect rows 1 and 2 to the backplane of the DAQ6510. When

channel 50 is closed, row 1 is connected to the INPUT of the DMM. When channel 49 is closed, row 2 is

connected to SENSE of the DMM.

Devices under test (DUT) are to be connected to the matrix columns. Using 2-wire connections, up to eight

DUTs can be tested. For 4-wire connections, up to four DUTs can be tested. Rows 3 to 6 can be used to add

one or more external sources to the test system.

Although the 7709 relays are the latching type (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 *RST or

reset () command is issued.

Figure 2: Simplified schematic for Model 7709

Model 7709 6 × 8 Matrix Module Instructions for use with DAQ6510

077147500 / June 2018

Matrix expansion

Basic matrix column expansion

The number of columns in a matrix test system can be increased by installing another 7709 in the DAQ6510.

Adding a second 7709 increases the total number of columns to 16.

The following figure shows a two matrix module system to test 16 DUTs. It is similar to a 2-wire DUT

measurement except that the second card allows eight more DUTs to be tested. As shown, channel 3 of the

second module is closed to connect DUT 11 to the DMM Input.

Figure 3: Two matrix module test system

The following figure shows a two matrix module system that uses an external source. It is similar to the one in

the previous figure except that it allows more DUTs to be tested. The first matrix module is used to route the

external source to the DUT, while the second module is used to measure the DUT.

As shown in the following figure, DUT 1 is tested by closing multiple channel 25 and channel 1 of the two

respective modules.

The other DUT is tested in a similar manner. DUT 2 is tested with channels 26 and 2 closed, DUT 3 is tested

with channels 27 and 3 closed, and so on.

Model 7709 6 × 8 Matrix Module Instructions for use with DAQ6510

077147500 / June 2018

Figure 4: Two matrix module test system with an external source

Daisy-chaining matrix rows

To route one or more external sources to other matrix modules, the rows of the modules must be

daisy-chained. External cabling is used to connect the rows of the matrix modules together.

The following figure shows examples of row daisy-chained matrix systems. For the 6 × 16 matrix,

daisy-chaining the two matrix modules allows the external source to be routed to the second module.

The matrix in this illustration is simplified to show external source connections to other matrix

modules. Connections to the DMM are not shown. Each signal path shown in this illustration is a two

conductor path pair (HI and LO).

Figure 5: Daisy-chained matrix modules

Model 7709 6 × 8 Matrix Module Instructions for use with DAQ6510

077147500 / June 2018

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.

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

Model 7709 6 × 8 Matrix Module Instructions for use with DAQ6510

077147500 / June 2018

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 the relays are open.

Since some relays may be latched closed, you must open all 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.