Agilent Technologies 34901A User Manual page 382

Chapter 8 Tutorial
Low-Level Signal Multiplexing and Switching
One-Wire (Single-Ended) Multiplexers
On the 34908A multiplexer, all of the 40 channels switch the HI input
only, with a common LO for the module. The module also provides a
thermocouple reference junction for making thermocouple measurements
(for more information on the purpose of an isothermal block, see page 350).
To DMM
Note: Only one channel can be closed at a time; closing one channel will open the
previously closed channel.
Two-Wire Multiplexers
The 34901A and 34902A multiplexers switch both HI and LO inputs,
thus providing fully isolated inputs to the internal DMM or an external
instrument. These modules also provide a thermocouple reference
junction for making thermocouple measurements (for more information
on the purpose of an isothermal block, see page 350).
To DMM
Note: 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.
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Channel 1
Channel 2
Channel 3
Channel 4
Channel 1
Channel 2
Channel 3
Channel 4
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