34970A Data Acquisition Control Unit

HP / Agilent 34970A Data Acquisition/Switch Unit

3-slot mainframe with built-in GPIB and RS232 interfaces
6 ½-digit (22-bit) internal DMM, scanning up to 250 channels per second
Built-in Signal conditioning measures thermocouples, RTDs, &  Thermistors, ac/dc Volts, & Current; Resistance; Frequency and Period

8 switch and control plug-in modules to choose from
50k readings of non-volatile memory holds data when power is removed
Hi/LO alarm limits on each channel, plus 4 TTL alarm outputs
Agilent BenchLink Data Logger software included



The Agilent 34970A consists of a three-slot mainframe with a built-in 6 ½ digit DMM. Each channel can be configured independently to

measure one of 11 different functions without the added cost or hassles of signal-conditioning accessories. Choose from eight optional

plug-in  modules to create a compact data logger, full-featured data acquisition system or low-cost switching unit. On-module screw-terminal

connections eliminate the need for terminal blocks and a unique relay maintenance feature counts every closure on every switch for easy,

predictable relay maintenance. Our most popular module 34901A features a built-in thermocouple reference and 20 two-wire channels.

Agilent BenchLink Data Logger software is included with the 34970A. BenchLink Data Logger gives you a familiar Microsoft Windows®

interface for test configuration and real-time data display and analysis. Setup and make measurements quickly, export data or use the built-in

graphs to log your results.

Customize your Agilent 34970A with plug-in modules

A complete selection of plug-in modules gives you high-quality measurement, switching, and control capabilities to choose from. Modules
include both low-frequency and RF multiplexers, a matrix switch, a general-purpose switch, and a multifunction module that includes
digital input/output, analog output, and totalizer capabilities. You can mix and match modules to get just the functionality you need right
now°Xthen change or add more channels later as your application grows.


Modules for the 34970A are designed to make your testing easier, faster, and more reliable. Here°¶s how:

Higher throughput

Our unique architecture incorporates a high-performance microprocessor on each module, offloading the mainframe processor and
minimizing backplane communications for faster throughput.

More channels in less space

Surface mount construction and a highly integrated design minimize the space required for relay drive and interface circuitry. High density
on-module connectors save both board and connector space normally required by a terminal block. We use the latest technology to
squeeze the most out of the remaining board space, giving you up to 40 single-ended channels in roughly the same space used by many
data acquisition system terminal blocks.

Convenient connections

On-module screw-terminal connectors make wiring more convenient. Built-in strain-relief cable routing and cable tie points keep your wiring
secure and safe from accidental tugs and pulls. An internal analog bus routes signals from any of the low-frequency multiplexers directly to
the internal DMM, without the need for external connections.


Use the chart below to help you pinpoint the modules that meet your needs.

Agilent Modules-at-a-Glance Selection Guide
Model Description Type












20ch Multiplexer 

2-wire armature

(4-wire selectable)

60 300 V 1A 10 MHz < 3 µV

Built-in cold junction reference

2 additional current channels (22 total)


16 ch Multiplexer

2-wire reed

(4-wire selectable)

250 300 V 50 mA 10 MHz < 6 µV Built-in cold junction reference


20 ch Actuator/GPS witch

SPDT/form C 120 300 V 1A 10 MHz < 3 µV °@


4 x 8 Matrix

2-wire armature 120 300 V 1A 10 MHz < 3 µV °@


Dual 4 ch RF Mux 50£[

Common Low


60 42 V 0.7 A 2 GHz < 6 µV

1 GHz bandwidth through

BNC-to-SMB adapter cable


Dual 4 ch RF Mux 75£[

Common Low


60 42 V 0.7 A 2 GHz < 6 µV

1 GHz bandwidth through

BNC-to-SMB adapter cable


Multifunction Module

Two 8-bit digital I/O ports

26-bit Event Counter

Two 16-bit Analog outputs


42 V

42 V

°”12 V

400 mA


10 mA


100 KHz



Open drain

Selectable input threshold

Max 40 mA total output per frame


40 ch Single-Ended Mux

1-wire armature 60 300 V 1A 10 MHz < 3 µV

Built-in cold junction reference

No four-wire measurements



More power and flexibility than you ever imagined you could afford


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