Additel PCal User Manual - Manual (Page 25)

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There are two methods that can be selected while calibrating a gauge.
Reverse Calibration means to match the UUT reading to the target Pressure.
Applying a pressure to hit a nominal reading on the pressure gauge, and then record
the reading from the reference. Matching the gauge allows for much faster
calibration since the Gauge value and the Reference value does not have to be
entered.
Observe Calibration means to match the reference to the Target Pressure.
Handle the pressure pump until the Reference reaches the Target Pressure, and then
enter the reading value of the pressure gauge in the text box.
The first method is easier than the other one and PCal uses this method by
default.
When performing transmitter calibration, a transmitter is required. PCal uses
the mA or V range value from the model information to compute the pressure from
the measured signals.