3. OPERATION
Page 71
© 2007 DH Instruments, a Fluke Company
Select
<3edit>
to edit the value of
P
offset
for the active Q-RPT and measurement mode
(see Section 3.5.1.1).
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 absolute measurement mode. AutoZ is
run automatically without operator intervention in gauge measurement mode whenever
PPCH-G is in the VENT condition (see Section 3.2.4).
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.
2.
Active Q-RPT for which
P
offset
is being viewed.
3.
Edit field for value of
P
offset
. Cannot be edited
if utility sensor is active and AutoZ is “by
baro”.
Poffset, Abs IH
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).
3.5.1.2
RUN AUTOZ
Run AutoZ applies only to PPCH-G Q-RPTs or utility sensors in absolute
measurement mode. In gauge measurement modes, AutoZ is run automatically
whenever the PPCH-G is in the VENT condition.
Run AutoZ is the function by which the current 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 RPT for
possible change in zero (see Section 3.5.1,
PRINCIPLE).
