The Keysight / Agilent / HP 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.

Mix two- and four-wire channels 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.

All multiplexer modules employ break-before-make scanning, ensuring only one closed channel (or channel pair) at a time. Multiple channel closures are allowed on the 34901A and 34902A modules when not configured for scanning.