Additional Features: 20-Channel GP Multiplexer 60 ch/s scanning Two- and four-wire scanning Built-in thermocouple reference junction 300 V switching The Agilent 34901A is the most versatile multiplexer for general purpose scanning 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.