3. OPERATION

3.3.9.3AUTOZ 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.

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© 2004-2007 DH Instruments, a Fluke Company

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Fluke RPM4 manual ENT RUN Autotest, Autoz in Differential Mode