The Keysight 34901A module for the 34970A/34972A Data Acquisition/Switch Unit is the most versatile multiplexer for general purpose scanning. It combines dense, multi-function switching with 60 channel/second scan rates to address a broad spectrum of data acquisition applications.
Two- and four-wire channels can be mixed on the same module. Two additional fused inputs (22 channels total) route up to 1A of current to the internal DMM, allowing ac and dc current measurements without the need for external shunt resistors.
| Key Features |
| 20 Channel Multiplexer |
| Two- and four-wire scanning |
| 300 V switching |
| 60 ch/s scanning |
| Built-in thermocouple reference junction |
| Specifications |
|
|
|
|
|
|
|
34970A and 34972A
Module Overview
|
|
|
|
|
|
|
|
| Module | Type | Speed (ch/sec) | Max Volts | Max Amps | Bandwidth | Thermal Offset | Comments |
34901A
20 ch Multiplexer + 2 current channels
| 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) |
34902A
16 ch Multiplexer
| 2-wire reed (4-wire selectable) | 250* | 300 V | 50 mA | 10 MHz | < 6 µV | Built-in cold junction reference |
34903A
20 ch Actuator/GP Switch
| SPDT/form C | 120 | 300 V | 1A | 10 MHz | < 3 µV |
|
34904A
4 x 8 Matrix
| 2-wire armature | 120 | 300 V | 1A | 10 MHz | < 3 µV |
|
34905A
Dual 4 ch RF Mux 50 Ω
| Common low (unterminated) | 60 | 42 V | 0.7 A | 2 GHz | < 6 µV | 1 GHz bandwidth through BNC-to-SMB adapter cable |
34906A
Dual 4 ch RF Mux 75 Ω
| Common low (unterminated) | 60 | 42 V | 0.7 A | 2 GHz | < 6 µV | 1 GHz bandwidth through BNC-to-SMB adapter cable |
34907A
Multifunction Module
| Two 8-bit digital I/O ports |
| 42 V | 400 mA |
|
| Open drain |
| 26-bit event counter |
| 42 V |
| 100 KHz |
| Selectable input threshold |
| Two 16-bit analog outputs |
| ± 12 V | 10 mA | dc |
| Max 40 mA total output per frame |
34908A
40 ch Single-Ended Mux
| 1-wire armature (common low | 60 | 300 V | 1A | 10 MHz | < 3 µV | Built-in cold junction reference No four-wire measurements |
Note:
* Up to 250 ch/sec to internal memory. See scanning rates for measurement condition and rate on each instrument.
| Ordering Information |
|
| Model Number | Description |
| Mainframe |
|
| 34970A | Data Acquisition/Switch Unit with RS-232 and GPIB |
| 34972A | Data Acquisition/Switch Unit with LAN and USB |
| Modules |
|
| 34901A | 20-Channel armature multiplexer |
| 34902A | 16-Channel reed multiplexer |
| 34903A | 20-Channel actuator/general purpose switch |
| 34904A | 4 x 8 Two-wire matrix switch |
| 34905A | Dual 4-Channel RF multiplexer, 50 Ohms |
| 34906A | Dual 4-Channel RF multiplexer, 75 Ohms |
| 34907A | Multifunction module |
| 34908A | 40-Channel single-ended multiplexer |
