Agilent/Keysight U2802A

The Keysight U2802A is a 31-channel thermocouple input module that delivers precision temperature measurement and signal conditioning for data acquisition systems. It converts low-voltage thermocouple signals into ±10 V outputs compatible with Keysight U2355A and U2356A DAQ devices via SCSI-II 68-conductor connection. The module supports eight standard thermocouple types (J, K, R, S, T, N, E, B) and includes built-in cold junction compensation, open thermocouple detection, and onboard EEPROM calibration storage with NIST traceability.

Technical Specifications

• 31 differential thermocouple inputs plus 1 cold junction compensation input


• Thermocouple Input Mode: ±100 mV signal acceptance; 10 kSa/s aggregate sampling across all channels; 4 Hz low-pass filter per channel; CMRR > 80 dB


• Voltage Input Mode: Direct ±10 V routing; > 500 kHz bandwidth; 500 kSa/s module sampling rate; CMRR > 60 dB


• Zero Mode: Shorts instrumentation amplifier inputs to measure and subtract offset errors Signal Conditioning


• Instrumentation amplifier on each thermocouple channel


• Built-in thermistor for cold junction compensation


• Isothermal terminal block construction


• Open thermocouple detection circuitry


• Zeroing function to compensate for temperature and long-term drift Calibration


• Onboard EEPROM stores per-channel gain and offset factors


• Module ID, serial number, and calibration date stored


• NIST traceable calibration


• Factory restoration available via KMM software Electrical


• Power: ±12 VDC, 750 mA maximum


• Input overvoltage protection: ±10 V module ground limit; TC+/TC– pins withstand ±17 V differential (short duration)

Key Features

• Eight thermocouple types per NIST ITS-90 database


• Per-channel amplification and filtering reduces noise


• Retrievable calibration data prior to measurements


• Isothermal design improves measurement accuracy

Compatibility & Integration Connects to Keysight U2355A or U2356A DAQ devices via SCSI-II 68-conductor cables.