Speed Scanning For Increased Test Throughput; Introduction; Equipment Required - Keithley DAQ6510 User Manual

Data acquisition and multimeter system

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Quick start manual (19 pages)

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Table of Contents

In this section:

Introduction .............................................................................. 9-1

Equipment required .................................................................. 9-1

Device connections .................................................................. 9-2

Speed scanning for increased production test throughput ....... 9-3

Introduction

There are three different multiplex modules available for use with the DAQ6510. This application

example demonstrates how each of the multiplexer modules can impact productivity by changing test

time. The multiplexer modules all share the same basic code base for switching, scanning, and

measuring. Any limits on system speed are the result of the relays in the multiplexer that switch the

signals from the device under test (DUT) into the instrument.

The Model 7700 20-Channel Differential Multiplexer Module uses electromechanical relays which

have low contact resistance and contribute only a minor offset potential (<1 Ω through the end of life

and < 500 nV, respectively). This results in the most accurate readings of the modules but with a 3

ms relay closure time, the slowest scan time in comparison to other options.

The 7703 multiplexer module uses reed relays which have low contact resistance (<1 Ω through the

end of life), but a higher contact potential (6 µV max) which contributes more signal offset and slightly

less precise readings. The benefit of this module is shorter relay close time (less than 1 ms) which

makes it approximately three times faster than the 7700.

The 7710 multiplexer module uses solid-state relays which have the highest contact resistance and

contact potential of the three options (<5 Ω and <1 µV, respectively) and are therefore the least

precise, however the 7710 has the overall speed advantage with a relay close time of less than 0.5

ms, making it twice as fast as the 7703 and at least six times faster than the 7700.

For comprehensive information on relay types, topologies, and the benefits or drawbacks of each, go

to the Keithley webpage on the

Equipment required

•

One DAQ6510

•

One Model 7700 20-channel differential multiplexer module

•

One Model 7710 20-channel differential multiplexer module

•

One computer set up for remote communication with the DAQ6510

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One device or component to be tested