The Keysight 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. 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. Standard Product Includes: 1 34901A, 20 Channel Multiplexer Module 1 Certificate of Calibration Counterfeit products have been found in the market. To ensure you are purchasing a Keysight product with the quality and performance you expect, purchase through Keysight authorized distribution partners only. Click on the “How to Buy or Rent Button” to find authorized distribution partners.