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HP 34902A 16-Channel Multiplexer

This module is divided into two banks of eight channels each. All 16

channels switch both

HI and LO inputs, thus providing fully isolated

inputs to the internal DMM or an external instrument. When making

4-wire resistance measurements, the instrument automatically pairs

channel n with channel n+8 to provide the source and sense connections.

The module has a built-in isothermal block to minimize errors due to

thermal gradients when measuring thermocouples.

Channel Switches

Bank Switch

Backplane Switches

Internal

DMM Input

Reference

Junction

Sensor

Internal

DMM Input

(4W Sense)

Com (4W Sense)

Com

100Ω

NOTES:

• If any channels are configured to be part of the scan list, you cannot close multiple channels;

closing one channel will open the previously closed channel.

• Current measurements on this module will require external shunt resistors.

Chapter 4 Features and Functions

HP 34902A 16-Channel Multiplexer

166

HP 34970A User Manual

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