Operational Flow
2-5
To convert thermocouple readings to temperature measurements, the CPU
refers to look-up tables, stored in ROM. A separate look-up table is avail-
able for each thermocouple type accommodated by the DAS-TC/B. The
look-up tables optimize accuracy by using more reference points along
ranges of greatest temperature-versus-voltage change than along ranges
of minimal change. (Using the same number of points at fixed intervals
would lead to error along ranges of greatest temperature-versus-voltage
change.)
As soon as all readings and conversions are complete, the DAS-TC/B
requests an interrupt and transfers all measurements to the computer.
The DAS-TC/B makes periodic measurements of the CJC and performs
self-calibration as a background task.
