Low-Level Signal Multiplexing and Switching
Low-level multiplexers are available in the following types: one-wire,
2-wire, and 4-wire. The following sections in this chapter describe each
type of multiplexer. The following low-level multiplexer modules are
available with the HP 34970A.
• HP 34901A 20-Channel Armature Multiplexer
• HP 34902A 16-Channel Reed Multiplexer
• HP 34908A 40-Channel Single-Ended Multiplexer
An important feature of a multiplexer used as a
DMM input channel is
that only one channel is connected at a time. For example, using a
multiplexer module and the internal
DMM, you could configure a
voltage measurement on channel 1 and a temperature measurement
on channel 2. The instrument first closes the channel 1 relay, makes the
voltage measurement, and then opens the relay before moving on to
channel 2 (called break-before-make switching).
Other low-level switching modules available with the HP 34970A
include the following:
• HP 34903A 20-Channel Actuator
• HP 34904A 4x8 Two-Wire Matrix
Chapter 8 Tutorial
Low-Level Signal Multiplexing and Switching
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