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RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 34
[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,
RPM4 beeps three times and the leak check results screen is displayed:
1. Total pressure change from start to finish of leak check time.
2. Indicator of Q-RPT used to run the leak check.
3. Average rate of change of pressure over the leak check
time period (∆P/time in seconds).
∆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.
To view the results of the most recently completed leak check, press <2view>. If NO leak
check data is stored (i.e., if the RPM4 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 [ENT] or [ESC] to return to the MAIN RUN screen.
Leak check is range specific in the sense that a 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.
3.3.6 [DISPLAY]
PURPOSE
To select, from a variety of choices, the information that is displayed on the second line of the
RPM4 display.
PRINCIPLE
RPM4 supports a variety of advanced pressure measurement functions that are displayed on
the second (bottom) line of the RPM4 display. In summary, the available display functions
included are:
AVERAGE Calculates the average pressure measurement over a user specified period
of time and displays the average, the standard deviation about the mean and
a countdown in seconds to the next average (see Section 3.3.6.1). This function
is often used to filter out pressure noise in an unstable system. The magnitude
of the noise is quantified by the standard deviation about the mean. A second
Avg screen allows the instantaneous pressure values to be viewed during an
averaging cycle.
RATE Calculates and displays the current rate of change of pressure in current
pressure units/second (see Section 3.3.6.2). This function is a useful
indication of the stability of the pressure being measured. It is often used as
an indication of positive or negative leak rate and as a go/no go criterion of
when to take data when comparing RPM4 and a device under test, for
example in a calibration. Rate is used by the Ready/Not Ready function to
determine when a Ready condition exists (see Section 3.2.1).
DEVIATION Continuously calculates and displays the difference between the pressure
measured by RPM4 and a target pressure entered by the user (see Section
3.3.6.3). This function is useful in monitoring the evolution of pressure around
and/or away from a desired set point.