Fluke HPMS - Manual (Page 50)

RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company Page 40
Before running AutoZ in gauge mode, ensure that the pressure applied to the
Q-RPT is truly zero gauge (atmospheric pressure). If running AutoZ in gauge mode
results in a zero offset that RPM4 considers unusually large, is
displayed. Check that zero gauge pressure is applied to the Q-RPT module rear panel
TEST(+) port and the ATM port is open to atmosphere and unobstructed.
Allow the RPM4 to stabilize at atmospheric pressure and ambient temperature
for 2 to 3 minutes before running AutoZ in gauge mode.
3.3.9.2 [AUTOZ] IN ABSOLUTE MODE
 PURPOSE
To “rezero” the active Q-RPT in absolute 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 Q-RPT and measurement mode. AutoZ ON is indicated by to the left of
the range 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
range, and measurement mode, is displayed when [AutoZ] is pressed.
To run AutoZ in absolute measurement mode, use [MODE] to set absolute
measurement mode (see Section 3.3.3) and press [AutoZ] from the main run
screen. The display is:
1. Active Q-RPT designator.
2. Current measurement mode (absolute).
3. Selection of source of P
std,0
reference to which
to AutoZ.
AutoZ Hi abs by:
13ntry 2COM2 3Lo RPT
Selecting <1entry> allows the value of P
std,0
to be entered from the front panel keypad.
Selecting <2COM2> allows the value of P
std,0
to be read automatically from another
DHI RPMx connected to RPM4’s COM2 communications port.
Selecting <3Lo RPT > is shown only if the Hi Q-RPT is active. This selection
allows the value of P
std,0
for the Hi Q-RPT to be read automatically from the
RPM4s Lo Q-RPT.
Allow the RPM4 to stabilize at atmospheric pressure and ambient temperature
for 5 to 10 minutes before running AutoZ in absolute mode.