Fluke RPM4 manual Autoz in Absolute Mode, AutoZ Hi abs by 1Entry 2COM2 3Lo RPT

RPM4™ OPERATION AND MAINTENANCE MANUAL

3.3.9.2[AUTOZ] IN ABSOLUTE MODE

PURPOSE

To “rezero” the active Q-RPT in absolute 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 Q-RPT and measurement mode. AutoZ ON is indicated by <z> to the left of the range 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 range, and measurement mode, <AutoZ OFF> is displayed when [AutoZ] is pressed.

Running AutoZ in or parallel mode (see Section 3.5.7.3) autozeros both the

Hi and Lo Q-RPTs simultaneously.

To run AutoZ in absolute measurement mode, set absolute measurement mode (see Section 3.3.3) and press [AutoZ] from the main run screen. The display is:

1.Active Q-RPT designator.

2.Current measurement mode (absolute).

3.Selection of source of Pstd,0 reference to which to AutoZ.

AutoZ Hi abs by: 1Entry 2COM2 3Lo RPT

Selecting <1Entry> allows the value of Pstd,0 to be entered from the front panel keypad.

Selecting <2COM2> allows the value of Pstd,0 to be read automatically from another DHI RPMx connected to RPM4’s COM2 communications port.

Selecting <3Lo RPT> is shown only if the active Q-RPT is Hi and there is a Lo Axxx Q-RPT in the RPM4. This selection allows the value of Pstd,0 for the Hi Q-RPT to be read automatically from the RPM4s Lo Q-RPT.

Allow the RPM4 to stabilize at atmospheric pressure and ambient temperature for 10 to 15 minutes before running AutoZ in absolute mode.

If running AutoZ results in a value of Poffset that is greater than ± 0.005 % FS of the span of the Q-RPT that is being AutoZeroed, the Q-RPT and/or the reference

used as the source of Pstd,0 may be out of tolerance or the AutoZ process may have been faulty. Before activating a new Poffset greater than ± 0.005 % FS of the active Q-RPT, check to be sure that both the Q-RPT and the reference

were in good working order, properly vented to stable atmospheric pressure, at the same height, and reading in the same pressure units when AutoZ was run.

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