PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 114
After the last point (Pt11) of calibration of the Lo (1) range has been completed,
execution proceeds to the determination of PA(z)tare for the reference transducer
being calibrated. Go to Section 5.4.4.5.
Backing Up in the Calibration, Repeating Points, Aborting
When executing pressure calibration points, pressing ESCAPE from any of the
calibration screens before the "ENTER standard pres." screen goes to the
previous screen. Pressing ESCAPE from the first screen, goes to the "RESULT"
screen for the previous point.
Pressing ESCAPE from any of the screens after the "ENTER standard pres."
screen returns to the "ENTER standard pres." screen.
Pressing ESCAPE from the "ENTER standard pres." screen goes to a prompt
asking whether to repeat the previous point. Pressing ESCAPE from that screen,
goes to the ABORT calibration option.
5.4.4.5 SETTING PA(Z)TARE
PRINCIPLE
PA(z)tare must be set as part of the calibration process for the PPC2 AF AutoZ
function to operate properly to allow "rezeroing" between calibrations (see Section
3.4.4.1, 5.4.1 Principle Setting PA(z)tare). Therefore, the determination of
PA(z)tare is included as a required step in the on-board calibration function.
OPERATION
The PA(z)tare function directly follows the running of the last range of the
calibration of the reference transducer being calibrated.
Operation of the PA(z)tare function is identical to the AutoZ function except that at
the end of the routine, old and new PA(z) tare are displayed rather than PA(z)net.
The procedure is different for the Hi and Lo reference transducers. Go to 5.2.1 Hi
ref or 5.2.2 Lo ref depending on which transducer is being calibrated for a
description of the PA(z)tare procedure.
5.4.4.6 PREVIEWING CALIBRATION DATA
PRINCIPLE
The Preview option is offered to allow the results of the calibration just completed
to be viewed prior to saving the results of the new calibration by overwriting the
previous calibration information.
The preview allows viewing of each range’s new PA/PM and PA(z)tare if they will
be changed by the new calibration. It also allows viewing of the "as left" data that
will result for any range that was actually calibrated, if the calibration is activated
(see Section 5.4.4.7). "As left" data shows the pressures applied by the standard
and the corresponding reference transducer readings having applied the new
PA/PM resulting from the calibration (see Section 5.4.1. Principle, PA/PM
Coefficients).
OPERATION
Once the PA(z)tare procedure is
complete, the Preview option is offered.
Hi ref cal complete
Preview 1Yes 2No
Press 2No to proceed to activating calibration results (see Section 5.4.4.7).
Press 1Yes to preview. The display is:
Preview Hi ref cal
1Rng1 2Rng2 3Rng3
Select the range to be previewed.
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