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3. OPERATION
Page 51 © 2004-2007 DH Instruments, a Fluke Company
3.3.9.3 AUTOZ IN DIFFERENTIAL MODE
PURPOSE
To compensate for the offset between the Hi Q-RPT and the Lo Q-RPT at the
operating “line pressure” in differential measurement mode.
See Section 3.5.1, Principle for a full explanation of the AutoZ function.
OPERATION
For the AutoZ function key to run AutoZ, AutoZ must be turned ON for the
active range and measurement mode. AutoZ ON is indicated by <z> to the
left of the Q-RPT designator on the first line of the main run screen. AutoZ
ON and OFF is set using [SPECIAL], <1AutoZ> (see Section
3.5.1). If AutoZ
is OFF for the active Q-RPT, and measurement mode, <AutoZ is off > is
displayed when [AutoZ] is pressed.
To run AutoZ in differential measurement mode, set differential as the
measurement mode (see Section 3.3.3) and press [AutoZ] from the main run
screen. <Running differential AutoZ> is displayed briefly before returning to the
main run screen.
Before running AutoZ in differential mode, set the “line pressure” at which
the differential measurements will be made and assure that a common
pressure is applied to both Q-RPTs. If running AutoZ in differential mode
results in a zero offset that RPM4 considers unusually large, <Confirm 0
DP> is displayed when AutoZ is pressed. Check that zero differential
pressure is applied across the Hi and Lo TEST(+) ports and press ENTER to
continue or ESCAPE to abort.
Allow the RPM4 to stabilize at atmospheric pressure and ambient
temperature for 2 to 3 minutes before running AutoZ in differential mode.
3.3.10 [ENT] (RUN AUTOTEST)
PURPOSE
To run the AutoTest function which AutoRanges the RPM4 and runs a calibration test based
on user entries of pressure unit, measurement mode, full scale, increment and DUT
tolerance.
Run AutoTest is accessed by pressing [ENT] from the Rate or Clean DISPLAY mode (see
Section 3.3.6.2). In other DISPLAY modes, the function of [ENT] is specific to the mode.