Keysight (Agilent) U2802A 31-Channel Thermocouple Input Signal Conditioner

The Keysight U2802A is a 31-channel thermocouple input signal conditioner that converts low-level thermocouple signals into DAQ-compatible voltage outputs. It integrates signal conditioning, instrumentation amplification, cold junction compensation, and open thermocouple detection to deliver accurate temperature measurements across eight standard thermocouple types (J, K, R, S, T, N, E, B). The module accepts differential thermocouple inputs up to ±100 mV and outputs ±10 V signals suitable for Keysight U2355A and U2356A data acquisition devices via dual 68-pin SCSI connectors.

– Technical Specifications

Input Channels & Signal Ranges
• 31 differential thermocouple channels plus 1 cold junction compensation (CJC) channel
• Input voltage range (thermocouple mode): ±100 mV
• Input voltage range (voltage mode): ±10 V signal + common mode
• Per-channel configuration for thermocouple or voltage input mode
• Eight standard thermocouple types: J, K, R, S, T, N, E, B (NIST ITS-90 compatible)

Signal Processing & Conditioning
• Instrumentation amplifier per channel
• Built-in thermistor for cold junction compensation
• 4 Hz low-pass filter in thermocouple mode
• Bandwidth (voltage mode): >500 kHz
• Built-in zeroing function for system offset compensation
• Open thermocouple detection circuitry
• Isothermal terminal construction

Performance
• Overall module sampling rate: 500 kSa/s
• Thermocouple mode sampling rate (all channels): 10 kSa/s
• NIST traceable calibration with on-board EEPROM storage

Physical & Electrical
• Dimensions: 159.7 mm W × 254.2 mm D × 40.5 mm H
• Weight: 1.036 kg
• Power: ±12 VDC, 750 mA maximum
• Operating temperature: 0 °C to +55 °C
• Storage temperature: -40 °C to +70 °C
• Relative humidity: 50% to 85% RH (non-condensing)

– Key Features

• Dual SCSI-II 68-conductor connectors for DAQ device integration
• Configurable per-channel input mode flexibility
• User-programmable calibration data storage in EEPROM
• Factory calibration restoration capability
• IEC 61326-1:2002 / EN 61326-1 EMC compliance
• IEC/EN 60068-2 shock and vibration tested

– Compatibility & Integration

Designed for use with Keysight U2355A and U2356A DAQ devices. Compatible with Keysight VEE, MATLAB R2007a, NI LabVIEW, and Microsoft Visual Studio. Includes Keysight IO Libraries Suite.