PPCH™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 52
Pressure control begins to set the first target value of the sequence using the
pressure control mode specified when setting up the sequence (or vent executes
if the first increment is zero). The display is:
1. Indication of sequence increment that is
currently being executed / total increments in
sequence. Changes to ENTER once
Ready
condition has been achieved at target value.
48.335 psi g IH
T60.000 D 2/11
Except for the bottom right hand corner, the sequence run display is identical to
the normal MAIN RUN screen (see Section 3.1.1). The bottom right corner
provides information on sequence execution. This information updates as each
sequence increment is executed.
Once a
Ready
condition has been achieved (see Section 3.2.3), use the direct
manual pressure control keys (
[
]
and
[
]
) to adjust the pressure set by
PPCH until the DUT reads the cardinal value of the pressure increment.
Once the DUT indicates the cardinal value of the pressure increment, press
[ENT]
. The display is:
1.
Final target pressure at which DUT indicated
cardinal value of the pressure point.
2.
<IN>
or
<OUT>
depending on whether DUT
was in or out of tolerance. DUT is <IN> if
cardinal point – PPCH pressure < DUT
tolerance * DUT span.
60.010 psi g IH
T60.012 IN 2/11
Press
[ENTER]
to accept this test point and proceed to the next test point or
[
←
]
to repeat the point.
Repeat set pressure, take reading and accept data at each point until all points in
the sequence have been accepted.
All QDUT tests end with a VENT command after the last point. To avoid the
VENT, press [ESC] after the last point.
After the last point in the sequence has
been completed, the display is:
AutoTest complete
1exit 2repeat 3data
Select
<1exit>
to go the MAIN run screen retaining the AutoRange that was
setup by QDUT.
Select
<2repeat>
to start the same test again at
<Prep & [ENT]>
.
Select
<3data>
to view the data collected in the QDUT AutoTest that was just
completed (see Section 3.4.5).
3.3.7
[HEAD]
PURPOSE
To cause a pressure fluid head correction to be added to or subtracted from the pressure
measured by the PPCH reference pressure transducer in order to predict the pressure at a
height other than the PPCH’s reference level.
