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Page 57
© 2011 Fluke Calibration
RPM
offset
= PGRPM
start
- RPM
indicate
Where:
PGRPM
start
=
Pressure applied by PG9000 to RPM
(nominally equal to
RPM
start
)
RPM
indicate
=
RPM reading when
PGRPM
start
is applied
to RPM test port
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
= PG
abs
- RPM
current
- RPM
offset
Where:
Pg
dif
=
Differential pressure defined by PG9000
Pg
abs
=
Absolute pressure defined by PG9000
RPM
current
=
Current RPM indication of static pressure
RPM
offset
=
Disagreement between PG9000 and RPM at
the operating static pressure
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>
.
Summary of Contents for PG9000 Series
Page 10: ...PG9602 OPERATION AND MAINTENANCE MANUAL 2011 Fluke Calibration Page X Notes...
Page 128: ...PG9602 OPERATION AND MAINTENANCE MANUAL 2011 Fluke Calibration Page 118 Notes...
Page 164: ...PG9602 OPERATION AND MAINTENANCE MANUAL 2011 Fluke Calibration Page 154 Notes...
Page 188: ...PG9602 OPERATION AND MAINTENANCE MANUAL 2011 Fluke Calibration Page 178 Notes...
Page 192: ...PG9602 OPERATION AND MAINTENANCE MANUAL 2011 Fluke Calibration Page 182 Notes...