Additel 221A Multifunction Temperature Calibrator User Manual - Manual (Page 70)

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Figure 10.8 AsCal Calibration Mode
The Calibration Mode page will appear if the UUT is indicator or recorder
(as shown in Figure 10.8).
About Reverse Calibration
Adjust the output signal of the calibrator until the reading of the UUT
displays a nominal set point, then record the reading from the calibrator.
The calibrator will calculate the UUT's theoretical reading accordingly.
In most cases, the reverse calibration is a very practical method, which
eliminates the trouble of manual recording.
Pressure indictors/recorders are also suitable for reverse calibration. You
can apply a pressure to read the pressure gauge then record the reading
from the pressure module (calibrator).
About Forward Calibration
The forward calibration is traditional, simple ways to calibrate. (To make
the calibrator output a nominal set point signals, and then record the
UUT's actual readings.)