Tektronix 7709 User manual

Keithley Instruments

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

tek.com/keithley

Model 7709 6 × 8 Matrix Module

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Instructions for use with DAQ6510

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.

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

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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

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

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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.

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

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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

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

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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

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

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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.

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

077147500 / June 2018