PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 30
When changing measurement modes for a range, if the full scale of the range is 700 kPa
(100 psi) or greater, the full scale is the same in both absolute and gauge modes. If the full
scale is less than 700 kPa (100 psi), the gauge mode full scale is 100 kPa (14.5 psi) lower
than the absolute mode full scale. If the absolute mode full scale is less than 100 kPa (14.5 psi),
there is no gauge mode available. Gauge and negative gauge mode, when available, always
have the same full scale.
OPERATION
To change the active measurement mode for a range,
press [MODE] from the MAIN RUN screen while the
range is active. The display depends upon the Q-RPT
or utility sensor that is active.
Measurement mode:
1abs 2gage 3neg gage
If an Axxx Q-RPT or a utility sensor is active, all thee measurement modes are supported:
absolute, gauge and negative gauge. Only gauge is available if absolute and negative gauge
modes are OFF (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.
Certain PPC3 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.
3.3.4 [AUTORANGE]
PURPOSE
To automatically set up PPC3 to optimize its measurement and control characteristics and
features to cover a specific pressure range.
[AutoRange] creates new ranges. See [Range] to select from existing ranges
(see Section 3.3.1).
PRINCIPLE
PPC3 is designed to support the calibration and test of a very wide variety of test ranges in
various measurement modes with a single pressure controller system.
The AutoRange function simplifies the task of selecting the Q-RPT best suited to cover a specific
test range and setting controller parameters appropriately for the range. These are set automatically
based on operator entry of desired measurement mode, pressure unit of measure and range
full scale. The selections and settings made by AutoRange are summarized in Table 6.
A range set up using AutoRange and all its range specific settings, may be saved for later
recall using [SETUP], <1range> (see Section 3.3.1). Saved ranges are available for
selection using [RANGE] (see Section 3.4.1). If a range created by AutoRange is not saved,
it is overwritten by the next AutoRange or erased when another range is selected or PPC3
power is turned OFF.
Use [AutoTest], <1QDUT> to AutoRange PPC3 based on DUT tolerance (see Section 3.3.6.2).
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