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Features and Functions 2
Agilent U2802A 31-Channel Thermocouple Input User’s Guide 29
Theory of Operation
Functionality of the System
Figure 2-2 System functionality block diagram for U2802A
1 Thermocouple voltage signals are detected at the U2802A thermocouple
inputs.
2 Signal is amplified with a gain of 97.673 by the U2802A.
3 The U2355A or U2356A DAQ converts the analog voltage signals to
digital voltage readings.
4 The AMM software (or IVI- COM driver) reads the Gain and Offset
calibration constants from the U2802A EEPROM via the DAQ DIO lines.
The digital voltage readings will be calibrated based on these constants.
5 The AMM software (or IVI- COM driver) converts the calibrated voltage
readings to temperature readings using the ITS- 90 conversion
polynomials.
U2802A_UG.book Page 29 Tuesday, January 8, 2008 10:24 AM