HP 34970A Plug-InModules

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	Common Uses
	Measurement Input
HP 34901A	20-Channel Mux with T/C	Scanning and direct measurement of
	Compensation	temperature, voltage, resistance, frequency,
		and current (HP 34901A only) using the
HP 34902A	16-Channel Reed Mux with T/C
		internal DMM.
	Compensation
HP 34908A	40-Channel Single-Ended Mux	Scanning and direct measurement of
	with T/C Compensation	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	Multiplexing of signals to or from external
	Compensation	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 (50Ω)	50Ω high-frequency applications (< 2 GHz).
HP 34906A	Dual 4-Channel RF Mux (75Ω)	75Ω 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.

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