PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 28
Before operating PPC3 with external Q-RPTs, check carefully that the external Q-RPT
TEST(+) port is connected to the PPC3 TEST(+) port. If the external Q-RPT is NOT
connected to the PPC3 TEST(+) port, it will not measure the pressure generated by PPC3
and PPC3 may reach a pressure higher than the target pressure before its watchdog
function recognizes that the external Q-RPT is not connected.
3.3.2 [UNIT]
PURPOSE
To select the unit of pressure in which PPC3 displays pressure values.
For information on selecting the measurement mode (absolute, gauge, negative gauge),
see Section 3.3.3.
PRINCIPLE
PPC3 allows the unit of measure in which pressure values are displayed to be changed.
PPC3 supports 15 different pressure units of measure as well as user defined units.
To simplify operation, quick access to six unit choices is made available under the [UNIT] key.
The default units available depend on whether the PPC3 was originally configured as an SI
or US version. The [UNIT] key contents can be customized by the user to any configuration
of six units (see Section 3.5.6).
Internally, PPC3 always operates in Pascal (Pa), the SI unit of pressure. Values of pressure
are represented in other units by the application of conversion factors to convert from Pa
(see Section 7.2.1).
OPERATION
To change the pressure unit of measure for the active
range, press [UNIT] from the MAIN RUN screen while
the range is active. The display is:
1kPa 2Pa 3MPa
4hPa 5bar 6mbar
The cursor is on the number corresponding to the pressure unit of measure active for the current range.
To change the pressure unit of measure, select the desired unit. Making the selection
returns to the MAIN RUN screen with the selected unit active.
The pressure measurement unit selected is range specific. When in a given range, all
functions and settings are represented in the current measurement unit for that range.
However, certain internal and/or metrological functions (e.g., Q-RPT calibration coefficients)
are always represented in Pa regardless of the active range unit of measure. In addition,
when the active unit is an altitude unit, the range and upper limit indications are in kPa if
the unit is meters (m) and psi if the unit is feet (ft).
See Section 7.2.1 for tables of the conversion factors used by PPC3.
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