WIKA CPH7650 Betriebsanleitung Seite 39

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6. Commissioning, operation
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 steps.
Accessing the menu item
Via and selection of the menu item: CALIBRATION (or see chapter 6.3.3 "Mode
CALIBRATION")
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 set point exactly).
As an exact setting of the pressure is not always possible under certain circumstances,
the true reference value is also recorded along with the actual value (test item value)
and the set point (reference value). With the WIKA-Cal software, this can be listed in the
calibration certificate.
If the calibration is to follow DKD/DAkkS guidelines, then the measured
value for each subsequent test point should not be recorded until a defined
time has passed (for example 30 seconds), consisting of a load change time
and settling time (see figure A: Calibration cycle to DKD/DAkkS guideline 6
- 1 for measurement uncertainty > 0.6 % of measuring span).
WIKA operating instructions, model CPH7650
M1
M2
Figure A
Z
2 Minutes
30 s 30 s
For Bourdon tube
pressure gauges:
5 minutes
Readings
EN
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