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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)
97
98
16
09
Com (4W Sense)
Com
01
99
100Ω
100Ω
100Ω
100Ω
08
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