Agilent/Keysight 34902A

The Agilent/Keysight 34902A is a 16-channel multiplexer module that integrates with the 34970A and 34972A Data Acquisition/Switch Units to expand automated test and data logging capabilities. Built around reed relay switching technology, the module delivers scan rates up to 250 channels/second and supports both two-wire and four-wire measurement configurations on the same card. Individual channels handle switching up to 300 V, with current measurement capability via user-supplied external shunt resistors.

A built-in thermocouple reference junction eliminates the need for external temperature compensation hardware. The 34902A mounts directly into compatible mainframes, providing cost-effective channel expansion without sacrificing switching speed or measurement flexibility.

Technical Specifications

• 16 channels per module


• Reed relay switching architecture


• Scan rate: Up to 250 channels/second


• Maximum switching voltage: 300 V per channel


• Wiring modes: Two-wire and four-wire (mixable on same module)


• Current measurement: Requires user-provided external shunt resistors


• Temperature measurement: Built-in thermocouple reference junction


• Module weight: Approximately 4 lbs

Key Features

• High-speed scanning optimized for automated production test


• Mixed-mode wiring configuration enables single-module deployment across diverse signal types


• Compact form factor for space-constrained test racks


• Thermocouple reference junction simplifies temperature data acquisition workflows

Typical Applications

• Automated component characterization and functional testing


• Multi-channel data logging and monitoring


• Temperature and voltage measurement in manufacturing environments


• Production test systems requiring high channel density and fast switching

Compatibility & Integration The 34902A plugs directly into Agilent/Keysight 34970A or Keysight 34972A Data Acquisition/Switch Units. Host mainframes provide connectivity via GPIB, RS-232 (34970A), LAN, and USB (34972A) interfaces.