34901A 20 Channel Multiplexer Module

The Keysight 34901A is the most versatile multiplexer for general-purpose scanning.
The multiplexer module for 34970A and 34972A data acquisition/switch units helps access the internal digital multimeter (DMM). It combines dense, multi-function switching with scan rates of 60 channels per second 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.