DH Instruments PPC4, Operation And Maintenance Manual

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PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 106
Note
While the Advanced Test is running, the upper half of the
display is exactly the same as the Main Run Screen, displaying
the Ready indicator, control indicator, measured pressure,
target pressure and pressure rate of change. See Section 5.1.
At any time during the sequence, [Previous Point] causes the PPC4 to go back
and retake the previous test point. [Next Point] stops the current point and
moves to the next test point in the sequence. On the last test point [Stop] is
shown instead of [Next Point] Completing the last point or [Stop] moves to the
Advanced Test summary screen.
[Back] aborts the sequence and returns to the previous screen. [Esc] or

aborts the sequence and returns to the Main Run Screen.
Once the test is complete the results are shown on the Advanced Test summary
screen. The pressure values from the PPC4 are shown with the respective
sequence numbers. If there are more than eight points in the test then a scroll
bar is shown.
Note
Select and Enter the highlighted number in the list to scroll.
If UUT Tolerance is used (specified in the AutoRanger screen, see Section
5.7.2.3.1) then the summary screen will also include “pass” , “fail” or “ATM” for
each point in the sequence. The criteria for pass/fail assumes that the UUT is
adjusted to the cardinal values of each test point and calculates an error based
on the difference between the test point and the PPC4 reading.
Pass: The difference between the PPC4 pressure and the UUT is less than
or equal to the UUT Tolerance, expressed as a percent of
AutoRange span.
Fail: The difference between the PPC4 pressure and the UUT is greater
than the UUT Tolerance.
N/A: Targets of 0 and Vent do not have pressure adjustment for UUT
cardinal point. Pass/Fail determination is not applicable.
[Back] returns to the Advanced Test Run Screen to start the same test sequence
again. [Esc] or

returns to the Main Run Screen.
5.7.3 Pressure
The [Tools], <Pressure> tab contains the utility pressure functions Purge and Leak Test. The
[Tools], <Pressure> screen displays the Purge enable status and the results of the last
successful Leak test. If the Purge function is enabled (see Section 5.7.12.3) then the display
shows
<Purge: On> . If the Purge function is disabled then the display shows <Purge: Off> .
The Leak Test results show the results of the last successful Leak Test in rate (Units/s) and
pressure change in the Units active at the time of the test.
5.7.3.1 Purge

PURPOSE
To execute the PPC4 test system Purge function using the optional Self Purging
Liquid Trap (SPLT). Purge is used to collect and exhaust liquid contaminants from
the device or system under test before they reach the PPC4 (see Section 3.2.17).