HP/Agilent 34921A 40-Channel Armature Multiplexer

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The HP/Agilent Keysight 34921A module for the 34980A Multifunction Switch/Measure Unit is the most versatile multiplexer for general purpose scanning. It has low thermal offset characteristics and a built-in thermocouple reference on the terminal block, making it ideal for temperature measurements directly to the internal DMM. The dense, multi-function switching with 100 channel/second scan rates addresses a broad spectrum of data acquisition applications.

Four additional fused inputs (44 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. Standard 50-pin Dsub connectors allow for use with standard cables, terminal blocks, or mass interconnect solutions.


Agilent Keysight 34921A 40-Channel Armature Multiplexer40 2-wire channels

  • 300V, 1A switch; 2A carry current
  • 100 ch/s scanning
  • Mix 2- or 4-wire configurations
  • Built-in thermocouple reference junction
  • 4 current channels
  • Latching armature relays, with relay counter


Part Number Description
34980-90021 User’s Guide


Option Description
34921T Terminal Block

This Keysight 34921A 40-Channel Armature Multiplexer is a high-quality test equipment part suitable for a wide range of industries. Made by Agilent, it is a reliable and durable component that can help improve the accuracy and efficiency of your testing processes. Perfect for use with the Keysight 34980A, this multiplexer offers 40 channels to help you quickly and easily switch between different test points. Whether you are working in the electronics, automotive, or aerospace industries, this multiplexer is an ideal choice for improving your testing capabilities. So if you need a top-quality test equipment part, look no further than the Keysight 34921A 40-Channel Armature Multiplexer.

Additional information

Weight 8 lbs
Dimensions 2 × 10 × 8 in


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