PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 46
To access the LEAK CHECK function, press [LEAK CHECK] from the MAIN RUN screen.
Select <1run> to run a leak test. The display is:
1. Edit field for the time over which the leak check pressure
change will be measured, in seconds.
Set leak check time:
15 s
Edit the leak check time if desired (minimum 1, maximum 999) and press [ENT].
Press [ENT] again when ready to start the leak test. The leak test display is:
1. Standard MAIN RUN screen first line showing measured
pressure.
2. Active RPT position indicator
3. Indication that leak test is running and countdown of time
remaining.
957.84 kPa a HI
Leak testing 13 s
[ESC] can be used to abort the running leak test. [ENT] while the leak test is running
restarts the leak check timer. When the leak check timer countdown has completed, the leak
check results screen is displayed:
1. Total pressure change from start to finish of leak check time.
2. Indicator of RPT used to run leak check.
3. Average rate of change of pressure over the leak check
time period.
∆P 0.61 kPa a HI
Rate 0.06 kPa/sec
From the leak check results screen, press [ENT] to repeat the leak test.
Press [ESC] to return to leak check main menu and exit to the MAIN RUN screen.
As a general rule, the maximum acceptable leak rate for optimal PPC3 automated pressure
control operation and to assure in tolerance measurements with default pressure control
parameters is 0.5 % of current range span/minute. In dynamic control mode, to handle higher
test system leak rates, increase the hold limit using [SPECIAL], <6control>, <1limits> (see
Section 3.4.6.1).
To view the results of the most recently completed leak check, press <2view>. If NO leak
check data is stored (i.e., if the PPC3 has never run a leak test or a reset has cleared
previous leak test results), the results screen displays <Data NOT available> briefly and
returns to MAIN RUN screen. Press [ENTER] or [ESC] to return to the MAIN RUN screen.
Leak check is range specific in the sense that leak check is run using the active range.
However, only one set of leak check results is maintained in memory and each leak test
completed overwrites the memory. View leak check always shows the results of the last
leak check run regardless of the range that is now active. The results screen includes the
range indicator to indicate the range in which the leak check was run.
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