Fluke RPM4 manual Differential Measurement Mode Operation, Meas mode 1abs 2gage 3neg gage 4dif

3. OPERATION

If an Axxx Q-RPT is active, all thee measurement modes are supported: absolute, gauge and negative gauge. Only gauge is available if absolute and negative gauge modes have been turned OFF in calibration (see Section 5.2.5).

If a Gxxx Q-RPT is active, only gauge measurement mode is supported. When the [MODE] key is pressed, <Gauge RPT, gauge mode only> is displayed.

If the Hi Q-RPT is active in its default range (<DF>), and the RPM4 has two Q-RPTs of the same type (Axxx, Gxxx, BGxxx), differential measurement mode is available in addition to the other modes (see Section 3.3.3.1).

Certain RPM4 settings, including AutoZ ON/OFF (see Section 3.5.1) are range AND measurement mode specific. See Table 4 for a listing of settings and what they are specific to.

Absolute and negative gauge modes on an Axxx Q-RPT can be turned OFF in the calibration function (see Section 5.2.5). When absolute and negative gauge mode are turned OFF for an Axxx Q-RPT, only gauge mode can be activated. <Gauge mode only, other modes OFF> is displayed when [MODE] is pressed.

3.3.3.1DIFFERENTIAL MEASUREMENT MODE OPERATION

Differential mode operation is only available on the Hi Q-RPT, default (<DF>) range, in RPM4s that are equipped with two Q-RPTs (Hi and Lo) of the same type (Axxx, Gxxx, BGxxx).

To activate differential measurement mode, press [MODE] from the MAIN RUN screen while the Hi Q-RPT is active and in its default (<DF>) range. The actual display depends upon the measurement modes available on the Hi Q-RPT.

The cursor is on the base measurement mode. The line pressure measurement mode is the base pressure measurement mode.

Meas mode: 1abs 2gage 3neg gage 4dif

To activate differential measurement mode, press the keypad number key for the <dif> selection or move the cursor to the <dif> selection and press [ENT]. Operation returns to the main run screen. When differential mode is active, the cursor is on both the base mode and differential mode.

When differential mode is active, the Q-RPT position indicator is in the upper right hand corner of the main run screen and other displays is <Hd> instead of <Hi> (see Section 3.2.3, Table 3).

When differential mode is activated, AutoZ should be run at the line pressure with zero differential pressure applied to eliminate the zero error on differential pressure due to the disagreement of the Hi and Lo Q-RPTs (see Section 3.3.9.3).

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