PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 62
The value of P
offset
is always displayed and entered in Pascal (Pa). Normally, in day to
day operation, the value of P
offset
is changed by running AutoZ (see Section 3.5.1.2),
not direct editing.
• Select <4run> to run the AutoZ routine which determines and activates P
offset
relative to
P
std,0
(see Section 3.5.1.2). <4run> is only applicable to Axxx (absolute) Q-RPTs in
absolute measurement mode. AutoZ is run automatically without operator intervention in
gauge and negative gauge measurement modes whenever PPC3 is in the VENT
condition (see Section 3.2.3, PRINCIPLE).
3.5.1.1 EDIT AUTOZ
The edit AutoZ function should be used with great caution as entering
inappropriate values and turning ON AutoZ may result in out of tolerance
measurements. In normal day to day operation, the value of the AutoZ
offset, P
offset
, should be changed using the run AutoZ function (seen Section
3.5.1.2) in absolute measurement mode or automatically in gauge modes.
Before editing P
offset
, see Section 3.5.1, PRINCIPLE.
To edit the current P
offset
value for the active Q-RPT and measurement mode,
press [SPECIAL], <1AutoZ>, <3edit>. The display is:
1. <abs> for absolute, <gage> for gauge and
negative gauge.
2. Active Q-RPT for which P
offset
is being viewed.
3. Edit field for value of P
offset
.
Poffset, Abs X1H
8.4 Pa
Edit P
offset
as desired and press [ENT] to activate the new value. Press [ESC] to
abandon changes.
The value of P
offset
is always displayed and entered in Pascal (Pa).
Edit and view AutoZ are not available for external Q-RPTs in gauge mode.
3.5.1.2 RUN AUTOZ
Run AutoZ applies only to Axxx Q-RPTs in absolute measurement mode. In
gauge and negative gauge measurement modes, AutoZ is run automatically
whenever the PPC3 is in the VENT condition.
Run AutoZ is the function by which the current Q-RPT reading is compared to a
reference, P
std,0
, at atmospheric pressure to determine a new value of P
offset
.
The value of P
offset
is then used by AutoZ to automatically correct the Q-RPT for
possible change in zero (see Section 3.5.1, PRINCIPLE).
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