Agilent Technologies 34901A User Manual page 386

Chapter 8 Tutorial
Low-Level Signal Multiplexing and Switching
The 34901A and 34902A multiplexers have an additional relay, called a
bank switch or tree switch, which helps reduce channel-to- channel noise
(C ). The multiplexer channels are divided into two banks. The bank
adj
switch isolates one bank of channels from the other, effectively removing
any parallel adjacent capacitance from the isolated bank. During a scan,
the instrument automatically controls the bank switches.
DMM
If you are not using all of the channels on the multiplexer, divide the
input signals equally between Bank 1 and Bank 2. For example, if you
are multiplexing eight channels using the 16-channel multiplexer,
use four channels in the lower bank and four channels in the upper
bank. For even better noise immunity, leave one unused, grounded
channel between each input channel.
Module
34901A Channels 1 through 10
34902A Channels 1 through 8
34908A Channels 1 through 20
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Bank Switch
Channel
Switch
Bank Switch
C
adj
Channel
Source
Switch
Source
Bank 1 Bank 2
Channels 11 through 20
Channels 9 through 16
Channels 21 through 40
C
adj
Bank 1
Source
Source
Bank 2
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