RPM4-AD™ OPERATION AND MAINTENANCE MANUAL
© 2005-2007 DH Instruments, a Fluke Company
Page 60
•
To assure operation within measurement uncertainty specifications (see Section 1.2.2.1),
run AutoZ whenever vented in gauge mode, whenever the line pressure is changed in
differential mode and at least every 30 days or when RPM4-AD has been exposed to
temperature changes exceeding 15 ºC (36 ºF) in absolute mode.
•
In
absolute measurement
mode
:
Run AutoZ only when a reference whose
measurement uncertainty is known to be significantly better than that of the Q-RPT to be
AutoZeroed is available. The best possible reference with which to run AutoZ in absolute
measurement mode is a gas operated piston gauge (such as a
DHI
PG7601) applying
atmospheric pressure to the RPM4-AD
TEST
port. The best day to day reference is a
properly calibrated
DHI
RPM4 BA100K/BA100K interfaced directly as an external device
to the RPM4-AD COM2 port.
•
In
absolute measurement modes:
Allow the RPM4-AD to stabilize at atmospheric
pressure and ambient temperature for 10 to 15 minutes before running AutoZ.
OPERATION
The AutoZ function and values are Q-RPT AND measurement mode (absolute, gauge or
differential) specific.
[SPECIAL], <1AutoZ> is to perform AutoZ management functions such as turning AutoZ
ON and OFF. In day to day operation, to RUN the AutoZ routine that rezeroes the
Q-RPTs, use [AutoZ] (see Section 3.3.9).
To access the RPM4-AD AutoZ function press
[SPECIAL]
,
<1AutoZ>
. The display is:
1.
Active Q-RPT designator.
2. Indication of active measurement mode (
<abs>
for absolute,
<gage>
for gauge and negative gauge,
<dif>
for differential).
3. Indication of whether AutoZ is currently ON or OFF for this
Q-RPT and measurement mode.
1off 2view Hi
3edit abs ON
Select
<1off>
(or
<1on>
) to change the AutoZ status for the current Q-RPT and
measurement mode from ON to OFF or vice versa.
AutoZ ON is indicated by a <z> in the MAIN RUN screen, top line, fourth character from
the right. When AutoZ is OFF, the character is blank.
Select
<2view>
to view the current value of
P
offset
for the active Q-RPT(s) and measurement mode.
P
offset
should be zero when the RPM4-AD is new or has just been calibrated. P
offset
should
be roughly equal to atmospheric pressure when operating in gauge mode.
Select
<3edit>
to edit the value of
P
offset
for the active Q-RPT and measurement mode
(see Section 3.5.1.1). This function is not normally used. In normal operation,
[AutoZ]
should
be used to obtain the value of
P
offset
(see Section 3.3.9).
The value of P
offset
is always displayed and entered in Pascal (Pa).
Содержание RPM4-AD
Страница 10: ...RPM4 AD OPERATION AND MAINTENANCE MANUAL 2005 2007 DH Instruments a Fluke Company Page VIII N NO OT TE ES S...
Страница 22: ...RPM4 AD OPERATION AND MAINTENANCE MANUAL 2005 2007 DH Instruments a Fluke Company Page 12 N NO OT TE ES S...
Страница 90: ...RPM4 AD OPERATION AND MAINTENANCE MANUAL 2005 2007 DH Instruments a Fluke Company Page 80 N NO OT TE ES S...
Страница 138: ...RPM4 AD OPERATION AND MAINTENANCE MANUAL 2005 2007 DH Instruments a Fluke Company Page 128 N NO OT TE ES S...
Страница 142: ...RPM4 AD OPERATION AND MAINTENANCE MANUAL 2005 2007 DH Instruments a Fluke Company Page 132 N NO OT TE ES S...
