6 Commissioning, operation
32 WIKA Operating Instruction, Model CPH7600
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6.10.3 %-Error function
The calibrator features a special function which can calculate the error in the pressure value from
the mA value as a percentage of the 4 ... 20 mA loop span. The %-Error mode uses all three
screens and has a special menu structure. It displays pressure, mA and %-Error simultaneously.
Figure 6: CPH7600 with a pressure transmitter with %-Error function
Example:
Suppose a pressure transmitter under test has a full scale range of 2 bar and gives a
corresponding 4 ... 20 mA output signal. The user can programme in a 0 ... 2 bar pressure span
into the calibrator and the calibrator will then calculate and display the deviation or %-Error value
from the 4 ... 20 mA output. This then eliminates manual calculations.
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