34902A 16-Channel Multiplexer - Agilent Technologies 34901A User Manual

Chapter 4 Features and Functions

34902A 16-Channel Multiplexer

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 thermocouple reference junction to minimize
errors due to thermal gradients when measuring thermocouples.
Internal
DMM Input
Reference
Junction
Sensor
Internal
DMM Input
(4W Sense)
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.
•
Connections to ac line are not recommended unless you provide external transient suppression.
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Backplane Switches Channel Switches
98
99 Bank Switch
97
01
08
100Ω
Com
100Ω
100Ω
Com (4W Sense)
100Ω
09
16