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2Features and Functions
28 Agilent U2802A 31-Channel Thermocouple Input User’s Guide
System Overview
Figure 2-1 System overview of U2802A with DAQ
The U2802A is essentially an amplifier module with a built- in temperature
sensor (thermistor). In thermocouple mode, the U2802A input channel is
used to amplify a differential voltage signal from a thermocouple (or any
low voltage signal source in the range of ±100 mV) by 100 times. The
signal is then output as an analog voltage in the ±10 V range into the DAQ
for conversion to a digital voltage reading.
The built-in thermistor in the U2802A can be read from Channel AI148 of
the U2300A series DAQ. The conversion from voltage to temperature for
this thermistor reading is done automatically by the AMM software. This
temperature reading will subsequently be used as the Cold Junction
Compensation (CJC) reference temperature.
With the correct voltage reading from the thermocouple and the CJC
temperature, the AMM software will then proceed to convert the
thermocouple voltage reading into a temperature reading, based on the
NIST ITS-90 Thermocouple Database. This reading is then corrected for
both gain and offset errors due to the U2802A amplifiers using the
calibration constants stored in the U2802A EEPROM, which are read by
the PC via the DAQ's digital I/O lines.
The U2802A also has a built-in zeroing function, which allows users to
zero out the entire system's offset error, thus increasing the overall
accuracy of the system.
U2802A_UG.book Page 28 Tuesday, January 8, 2008 10:24 AM
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