5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 131 © 2002-2007 DH Instruments, a Fluke Company
calibration was performed in gauge mode, turn absolute and negative gauge modes OFF to
avoid their being used after the calibration.
Calculate as left data for the calibration if desired following:
as left reading = (non-corrected reading • new PM) + new PA
Perform additional verification pressure runs as desired.
5.3 ADJUSTMENT OF ON-BOARD BAROMETER
PURPOSE
To adjust the output of the on-board barometer (see Section 1.2.2.3).
PPC3’s that have only Gxxx Q-RPTs (no Axxx or BGxxx) are NOT equipped with an on-board barometer.
PRINCIPLE
The on-board barometer output can be adjusted using PA and PM values in the same manner as
Q-RPTs (see Section 5.2.1.1).
The on-board barometer is a low accuracy sensor used only for measuring changes in atmospheric
pressure over short periods of time (see Section 3.2.3) and the line pressure for G15K and BG15K line
pressure compensation. PPC3 measurement uncertainty does not depend on the measurement
uncertainty of the on-board barometer.
OPERATION
To edit the values of PA and PM for the barometer, press [SPECIAL], <8cal>, <2barometer>. Pressing
[ENT] steps through displays of the calibration date [YYYYMMDD] and PA and PM. In edit mode,
the values can be edited. Pressing [ENT] after the last screen activates the edited values.
To view the current output of the on-board barometer, press [SPECIAL], <7Internal>, <3baro>.
5.4 ADJUSTMENT OF UTILITY SENSOR
PURPOSE
To adjust the output of the utility sensor, if present (see Section 1.2.2.2).
PRINCIPLE
PPC3s that do not have a Q-RPT in the Internal, Hi position, have a utility sensor.
The utility sensor output can be adjusted using PA and PM values in the same manner as for the Q-RPTs
(see Section 5.2.1.1).
The utility sensor is not intended to serve as a pressure reference for low uncertainty, traceable
measurement. It is for indication, pressure control and system maintenance functions only.
PPC3 measurement uncertainty when using Q-RPTs does not depend on the measurement uncertainty
of the utility sensor.
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