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3. OPERATION
Page 29 © 2004-2007 DH Instruments, a Fluke Company
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.
3.3.3.1 DIFFERENTIAL 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).