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RPM4™ OPERATION AND MAINTENANCE MANUAL
© 2004-2007 DH Instruments, a Fluke Company Page 36
When RPM4 is initialized as an external device to a PPC3 pressure controller, the RPM4
front panel keypad is locked out and the second line of the display becomes:
<PPC3 EXT DEV: IDLE> (if RPM4 is initialized by PPC3 but not currently in use)
<PPC3 EXT DEV: ACTIVE> (if RPM4 is initialized by PPC3 and is currently in use)
After using an RPM4 as an external device for a PPC3, cycle power to return to the
previous RPM4 settings, restore front keypad capability and return to the normal main
run screen.
3.3.6.1 AVG (AVERAGE)
PURPOSE
To activate the Average DISPLAY and/or adjust the period of time over which
averaging occurs.
See Section 3.3.6. Principle.
OPERATION
To access the Average DISPLAY, press [DISPLAY], <1Avg>. The display is:
1. Edit field for averaging period in seconds.
Default is 20. Minimum 1, maximum 999.
Averaging Period:
20 s
Edit the averaging time period if desired. Pressing [ENT] returns to the main run
screen with the Average DISPLAY active.
With the Average DISPLAY active the main run screen is:
1. Average measured over last completed
averaging period.
2. Standard deviation of last completed
averaging period.
3. Countdown in seconds until completion of on-
going averaging period.
96.929 kPa a Hi
δ 0.0007 18Avg
The Average DISPLAY has a second screen that allows the instantaneous
pressure readings to be viewed while an averaging cycle is running.
The instantaneous Average screen is:
1. Instantaneous pressure values at RPM4’s
normal update rate.
2. Current rate of change of pressure in pressure
units/second.
3. Countdown in seconds until completion of on-
going averaging period.
96.929 kPa a Hi
R 0.0025 18Avg
The [+/-] key toggles between the main run Average screen and the
instantaneous values Average screen.