The Keysight/Agilent/HP 34901A is a 20-channel multiplexer module engineered for the 34970A and 34972A Data Acquisition/Switch Units. This plug-in module delivers dense signal routing with 22 total channels—20 multiplexed inputs plus 2 dedicated fused current channels—supporting both 2-wire and 4-wire scanning configurations. Operating at scan rates up to 60 channels per second, the 34901A handles voltage switching to 300 V and current measurements to 1 A without external shunt resistors. A 10 MHz bandwidth ensures signal integrity across demanding automated test, data logging, and laboratory measurement applications.
Technical Specifications
• Channel Count: 20-channel multiplexer + 2 fused current channels (22 total)
• Scanning Configuration: 2-wire and 4-wire on same module
• Scan Rate: Up to 60 channels per second
• Maximum Voltage: 300 V
• Maximum Current (Current Channels): 1 A AC/DC
• Bandwidth: 10 MHz
• Analog Input: Universal inputs with built-in signal conditioning
– Key Features
• Simultaneous 2-wire and 4-wire measurement capability
• Built-in thermocouple reference junction for temperature measurement
• HI/LO alarm capability on each channel (with 34970A mainframe)
• Direct AC/DC current measurement capability to 1 A on dedicated channels
• Universal input architecture supports voltage, resistance, frequency, period, and temperature
• Measurement accuracy dependent on mainframe DMM: 6½ digits (22-bit) resolution with 0.004% basic DCV accuracy available on 34970A
– Typical Applications
• Automated test and measurement systems requiring multi-channel signal routing
• Data acquisition and logging in laboratory environments
• Mixed-signal test requiring both voltage and current measurements
• Temperature monitoring via thermocouple scanning
– Compatibility & Integration
Designed exclusively for Keysight/Agilent/HP 34970A and 34972A Data Acquisition/Switch Units. Integrates with complementary switching modules including the 34902A, 34903A, 34904A, 34905A, and 34908A within the 3-slot mainframe architecture.
