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Chapter 3 System Overview
Data Acquisition System Overview
Plug-In Modules
The HP 34970A offers a complete selection of plug-in modules to give
you high-quality measurement, switching, and control capabilities.
The plug-in modules communicate with the floating logic via the internal
isolated digital bus. The multiplexer modules also connect to the
internal DMM via the internal analog bus. Each module has its own
microprocessor to offload the mainframe processor and minimize
backplane communications for faster throughput. The table below shows
some common uses for each plug-in module.
For more information on each module, refer to the module sections in
chapter 4, starting on page 163.
Model Number
Module Name
HP 34901A
20-Channel Mux with T/C
Compensation
HP 34902A
16-Channel Reed Mux with T/C
Compensation
HP 34908A
40-Channel Single-Ended Mux
with T/C Compensation
HP 34907A
Multifunction Module
HP 34901A
20-Channel Mux with T/C
Compensation
HP 34902A
16-Channel Reed Mux with T/C
Compensation
HP 34908A
40-Channel Single-Ended Mux
with T/C Compensation
HP 34904A
4x8 Matrix Switch
HP 34905A
Dual 4-Channel RF Mux (50 )
HP 34906A
Dual 4-Channel RF Mux (75 )
HP 34903A
20-Channel Actuator
HP 34907A
Multifunction Module
54
Measurement Input
Scanning and direct measurement of
temperature, voltage, resistance, frequency,
and current (HP 34901A only) using the
internal DMM.
Scanning and direct measurement of
temperature, voltage, and resistance using
the internal DMM.
Digital Input, Event Counting.
Signal Routing
Multiplexing of signals to or from external
instruments.
32 Crosspoint Matrix switching.
50 high-frequency applications (< 2 GHz).
75 high-frequency applications (< 2 GHz).
Control Output
General-purpose switching and control
using Form C (SPDT) switches.
Digital Output, Voltage (DAC) Outputs.
Common Uses
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