WIKA CPH6000 - Handbuch (Seite 47)

47 WIKA operating instructions ProcessCalibrator, model CPH6000
11069023.04 11/2012 GB/D
GB
Figure A
With this example, the definition of individual test points/pressure steps for a calibration
is clarified. It is possible to prepare up to 16 calibrations, each with up to 32 test points.
■ Accessing the menu points:
Via and selection of the menu point: CALIBRATION (see chapter
7.3.3 "CALIBRATION mode")
Enter the desired test points in the way described on the previous page.
With the calibration of pressure measuring instruments with electrical output signals
(pressure transmitters/transmitters) the reference is calibrated to the display (i.e. the
pressure is always adjusted so that the reference value matches the setpoint exactly).
Since in all cases, an exact setting of the pressure is not always possible, along with the
actual value (test item value) and the setpoint (reference value), the true reference value
is also recorded.
With "PrintCal“ software one of the two combinations can be listed in the calibration
certificate.
If the calibration is to follow DKD/DAkkS guidelines, then the measured
value for the subsequent test point should not be recorded until a
defined time has passed (for example 30 sec.), consisting of a load
change time and settling time (see fig. A Calibration cycle to DKD/
DAkkS directive 6-1 for measurement uncertainty > 0.6 % of measuring
span).
7. Commissioning, operation