1PCS NEW keysight Agilent 34901A Multifunction Module for 34970A

Agilent 34901A

Product Title

Agilent 34901A 20-Channel Multiplexer (2/4-Wire) Module for 34970A / 34972A Data Acquisition Unit

Product Overview

The Agilent 34901A is a high‑performance armature multiplexer module designed exclusively for the Agilent 34970A and 34972A data acquisition / switch mainframe. It is the most widely used general‑purpose scanning module for multi‑channel signal measurement, integrating dense multi‑function switching with fast scan speed to satisfy diverse industrial and laboratory DAQ applications. This module supports mixed 2‑wire and 4‑wire resistance measurement on one single board, ideal for temperature, voltage and resistance scanning tests.

Key Features

✅ 20 primary multiplexer channels plus 2 fused current inputs (22 channels total)
✅ Dual 2‑wire / 4‑wire configurable scanning for precise resistance measurement
✅ Maximum switching voltage: 300 V
✅ Scan rate up to 60 channels per second
✅ Built‑in thermocouple cold‑junction reference junction, eliminates extra compensation hardware for T/C temperature testing
✅ Up to 1A direct AC / DC current measurement, no external shunt resistors required
✅ 10 MHz bandwidth, low thermal offset voltage < 3 µV
✅ Channel‑to‑channel & channel‑to‑earth isolation >10 GΩ
✅ Initial closed‑channel resistance < 1 Ω
✅ Armature relay design for stable low‑level signal switching

Full Specifications

- Compatible Host: Agilent 34970A, 34972A
- Channel Quantity: 20 multiplexer channels + 2 fused current inputs (22 total)
- Measurement Mode: 2‑wire / 4‑wire resistance, DCV, ACV, TC temperature, DC/AC current
- Max Switching Voltage: 300 V
- Max Switching Current: 1 A (for the two dedicated current channels)
- Scan Speed: 60 channels/sec
- Bandwidth: 10 MHz
- Thermal Offset: < 3 µV
- Isolation: >10 GΩ (ch‑ch, ch‑earth)
- Operating Temperature: 0 °C ~ 55 °C (full accuracy)
- Storage Temperature: -40 °C ~ 70 °C
- Power Consumption: 12 W, 25 VA peak
- Safety Standard: IEC 1010 Cat I, UL, CSA certified
- Status: Discontinued original Agilent model, widely available in used / refurbished test equipment market

Typical Applications

- Thermocouple multi‑point temperature monitoring
- 4‑wire precision resistance measurement
- Voltage signal scanning for product reliability test
- Industrial process signal logging
- R&D laboratory multi‑channel data acquisition

On Nov 6, 2026 at 01:31:09 PST, seller added the following information: