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3. OPERATION
Page 49 © 2004-2007 DH Instruments, a Fluke Company
When the run AutoZ selection is made, if a HEAD correction is currently active
(see Section 3.3.7) the head correction is momentarily disabled while running
AutoZ to avoid “zeroing out” the head value.
The value of P
offset
is always displayed and entered in Pascal (Pa).
Run AutoZ by Entry
AutoZ by entry allows the value of P
std,0
(see Section 3.5.1, PRINCIPLE) to be
entered directly from the RPM4 front panel. This provides a simple way of
AutoZeroing relative to an independent reference device such as a house
barometer that does not interface directly with RPM4.
To access run AutoZ by entry press [AutoZ], <1entry>. 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. Entry field for the value of P
std,0
. in the current
pressure unit of measure.
96.7755 kPa a Hi
Pstd,0:0.00000
Enter the value of the AutoZ reference (P
std,0
) in the same unit of measure as the
top line display and press [ENT]. RPM4 logs the reading and calculates a new
AutoZ offset value. The next display is:
Press [ENT] to activate the new value of
P
offset
or [ESC] to start over with entry of a
new AutoZ reference (P
std,0
) value.
Old P
offset
: 0.0 Pa
New P
offset
: 8.3 Pa
The value of P
offset
is always in Pascal (Pa). The value of P
std,0
is entered in
the current pressure unit of measure.
Run AutoZ by COM2
AutoZ by COM2 allows the value of P
std,0
(see Section 3.5.1 Principle) to be read
automatically from a DHI RPMx connected to the RPM4 COM2 communications
port. The RPMx is read and the new P
offset
is calculated automatically.