Martel Electronics BetaGauge 321A - Manual (Page 23)

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8.3 Percent Error Function
The calibrator features a unique function which can calculate pressure vs. milliamp error
as a percentage of the 4 to 20 mA loop span. The percent error mode uses all 3 screens
and has a unique menu structure. It simultaneously displays pressure, mA and percent
error.
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.