Fluke HPMS - Manual (Page 49)

3. OPERATION
Page 39 © 2007 DH Instruments, a Fluke Company
When a head correction is being applied, it is indicated by <h> in the fourth character from
the right in the top line of the MAIN RUN screen (see Section 3.1.1). When the head correction is
zero, the <h> is not shown.
The default head height unit is inches and the fluid species is Nitrogen (N
2
).To change units
of head height between inches and centimeters and to change the test fluid species, use
[SPECIAL], <3head> (see Section 3.5.3).
3.3.8 [SDS]
 PURPOSE
The SDS function is not used in RPM4 A70M/A20M-AF.
3.3.9 [A
UTO
Z]
 PURPOSE
To run the AutoZ function that rezeros the active Q-RPT between full calibrations.
See Section 3.5.1,  Principle for a full explanation of the AutoZ function.
 PRINCIPLE
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 changes in zero over time
(see Section 3.5.1,
 PRINCIPLE).
3.3.9.1 [AUTOZ] IN GAUGE MODE
 PURPOSE
To “rezero” the active Q-RPT in gauge measurement mode.
See Section 3.51,  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 3.51). 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 gauge measurement mode, use [MODE] to set gauge as the
measurement mode (see Section 3.3.3) and press [AutoZ] from the main run
screen. <Running gauge AutoZ> is displayed briefly before returning to the
main run screen.