Keithley 7702 40-channel Differential Multiplexer Module. The Keithley 7702 40-channel Differential Multiplexer is a plug-in module offering 40 channels of 2-pole or 20 channels of 4-pole multiplexer switching that can be configured as two independent banks of multiplexers. Applications include RTD, thermistor and thermocouple temperature. 40 channels for general-purpose measurements 2 additional channels to measure current 2-wire or 4-wire measurement Over-size screw terminal connection blocks 50MHz bandwidth 300V, 1A capacity for voltage channels; 60W, 125VA 3A capacity for current channels Relay closures stored in onboard memory