Omega PCL340 - Manual (Page 23)

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Figure 12.
Example:
Suppose a pressure transmitter under test is 30 psi (2 Bar) Full Scale
and outputs a corresponding 4 to 20 mA signal. The user can
program in a 0 to 30 psi pressure span into the calibrator and the
calibrator will calculate and display the deviation or % Error from the
expected 4 to 20 mA output. This eliminates the need for manual
calculations and also helps if it becomes difficult to set an exact
pressure with an external pump.
To use the %ERROR function proceed as follows:
1. With the calibrator turned on and operating press the F3 key to
activate the MORE menu option. Now press the F1 key to activate
the %ERROR option.
2. Press the F1 key to select the CONFIG option.
3. The first option is setting the Port, use the select option to scroll
through the port choices, when finished select the NEXT option.