PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 114
predict the pressure at a height other than the PPC4’s reference level (see
Section 3.2.16).
Note
Use of the Head function to ensure in tolerance measurements is
most important in low absolute pressure ranges. Specifying the
head height within ± 3 in. (7.5 cm) is adequate to ensure that, even
in the worst case, the uncertainty on the head correction will be
insignificant relative to the tolerance on the measurement.
OPERATION
[Settings], <Pressure>, Head
opens the Head screen. The shortcut to Head is
Head
: on the Main Run Screen (see Figure 11). In this screen edit:
Height:
The height of the UUT or measured pressure above the
reference level of the PPC4.
The reference height of the
PPC4 pressure measurement is
the middle of the PPC4 TEST
port. The head height should be
entered as a positive value if the
device or system under test is
higher than the PPC4 and
negative if it is lower.
Unit:
The unit of measure of the height measurement (centimeters or
inches)
Medium:
The fluid medium in the test connection between the TEST(+)
port and the UUT or measured pressure.
After editing values,
[OK]
to accept changes and return to the Main Run Screen.
[Back]
to return to
<Pressure>
.
[Esc]
or
exit to the Main Run Screen without
making a change.
Note
•
The currently active head values can be seen on the
Head
shortcut on the Main Run Screen (see Figure 11). The
height, unit and medium are shown. For example:
Head:
0 cm, N2
represents no head correction because the height
is equal to 0.
•
The Head function is NOT range specific. The Head ON or
OFF status remains the same as ranges are changed.
Edits made to the head settings are independent of active
range or Q-RPT.
•
When using external Q-RPTs in RPM4, it is recommended
that the RPM4 head height be adjusted to the reference level
of the PPC4 before connecting the RPM4. Then, the normal
PPC4 reference level to UUT head corrections can be made
for all the Q-RPTs, whether internal or external to PPC4.
5.7.6.4 Resolution
PURPOSE
To set the resolution with which measured pressures and other pressure
indications and settings are displayed.
Summary of Contents for PPC4
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