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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 Common Uses
Measurement Input
HP 34901A 20-Channel Mux with T/C
Compensation
Scanning and direct measurement of
temperature, voltage, resistance, frequency,
and current (HP 34901A only) using the
internal DMM.
HP 34902A 16-Channel Reed Mux with T/C
Compensation
HP 34908A 40-Channel Single-Ended Mux
with T/C Compensation
Scanning and direct measurement of
temperature, voltage, and resistance using
the internal DMM.
HP 34907A Multifunction Module Digital Input, Event Counting.
Signal Routing
HP 34901A 20-Channel Mux with T/C
Compensation
Multiplexing of signals to or from external
instruments.
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 32 Crosspoint Matrix switching.
HP 34905A
Dual 4-Channel RF Mux (50
Ω)
50
Ω high-frequency applications (< 2 GHz).
HP 34906A
Dual 4-Channel RF Mux (75
Ω)
75
Ω high-frequency applications (< 2 GHz).
Control Output
HP 34903A 20-Channel Actuator General-purpose switching and control
using Form C (SPDT) switches.
HP 34907A Multifunction Module Digital Output, Voltage (DAC) Outputs.
Chapter 3 System Overview
Data Acquisition System Overview
54