Fluke PG9000 Series Operation And Maintenance Manual page 67

RPM
Where:
PGRPM
start
RPM
indicate
Once the RPM offset has been determined, differential pressures are defined by
subtracting the static pressure measured by the RPM from an absolute pressure
defined by the PG9000 following:
PG
dif
Where:
Pg
dif
Pg
abs
RPM
current
RPM
offset
For differential mode operation, the PG9000 Differential Mode Interconnections
Kit should be used to provide the DUT high and low test connections and support
the RPM offsetting procedure (see Figure 19 and Section 3.10.4.1). A precision
Reference Pressure Monitor, such as a Fluke Calibration (DH Instruments)
RPM3, should be selected for the AtmP source in SETUP (see Section 3.11,
3.12.5.4). Other RPM models are a good choice, but the sheet metal for the
Differential Mode housing is sized for the RPM3.
PG9000 differential measurement mode manages the data acquisition,
communications, and handling to support differential mode operation without
operator effort. Differential mode operation requires setting the static pressure at
which differential measurements are to be made and regular determination of the
RPM offset. These functions are supported under [MODE], <4dif>.
Page 57
= PGRPM - RPM
offset start
= Pressure applied by PG9000 to RPM
(nominally equal to RPM
= RPM reading when PGRPM
to RPM test port
= PG - RPM - RPM
abs current
= Differential pressure defined by PG9000
= Absolute pressure defined by PG9000
= Current RPM indication of static pressure
= Disagreement between PG9000 and RPM at
the operating static pressure
3. GENERAL OPERATION
indicate
)
start
is applied
start
offset
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