3. OPERATION
Page 51
© 2005-2007 DH Instruments, a Fluke Company
The value of P
offset
is always displayed and entered in Pascal (Pa).
Run AutoZ by Lo RPT
AutoZ by Lo RPT is available only if the active Q-RPT is the Hi Q-RPT. AutoZ by
Lo RPT allows the Lo Q-RPT in an RPM4-AD to serve as the AutoZ reference
(source of
P
std,0
) (see Section 3.5.1,
PRINCIPLE). The Lo Q-RPT is read and
the new
P
offset
is calculated automatically.
To access run AutoZ by Lo RPT, first be sure that both Q-RPTs are at
atmospheric pressure. This can be accomplished by using SDS to isolate them
from the
TEST
ports and vent them. Press
[AutoZ]
,
<3Lo RPT>
. The display is:
1. Real time pressure reading (without head
correction), pressure unit of measure and
measurement mode of the active Q-RPT.
2.
Active Q-RPT position designator.
3.
Real time reading from the Lo Q-RPT.
96.7755 kPa a Hi
Pstd,0:97.7786
Observe the displayed pressures and verify that they are stable. When ready,
press
[ENT]
to cause AutoZ to run. RPM4-AD logs both readings and calculates
a new AutoZ offset value. The display is:
Press
[ENT]
to activate the new value of
P
offset
or
[ESC]
to start over.
Old P
offset
: 0.0 Pa
New P
offset
: 3.1 Pa
The value of P
offset
is always displayed and entered in Pascal (Pa).
3.3.9.3
AUTOZ IN DIFFERENTIAL MODE
PURPOSE
To compensate for the offset between the Hi Q-RPT and the Lo Q-RPT at the
operating “line pressure” in differential measurement mode.
See Section 3.5.1,
Principle for a full explanation of the AutoZ function.
OPERATION
For the AutoZ function key to run AutoZ, AutoZ must be turned ON for the
active range and measurement mode. AutoZ ON is indicated by <z> to the
left of the Q-RPT designator on the first line of the MAIN RUN screen.
AutoZ ON and OFF is set using [SPECIAL], <1AutoZ> (see Section 3.5.1). If
AutoZ is OFF for the active Q-RPT, and measurement mode, <AutoZ is off >
is displayed when [AutoZ] is pressed.
To run AutoZ in differential measurement mode, set differential as the
measurement mode (see Section 3.3.3) and OPEN SDS if SDS is CLOSED (see
Section 3.3.8.1).
Press
[AutoZ]
from the MAIN RUN screen.
