3. OPERATION
Page 37
© 2007 DH Instruments, a Fluke Company
Absolute mode on a PPCH-G Q-RPT can be turned OFF in the calibration function (see
Section 5.2.5). When absolute mode is turned OFF, only gauge mode can be activated. <Gauge
mode only, abs mode OFF> is displayed when [MODE] is pressed.
3.3.4
[A
UTO
R
ANGE
]
PURPOSE
To automatically set up PPCH-G to optimize its measurement and control characteristics and
other features to cover a specific pressure range.
[AutoRange] creates new ranges. See [Range] to select from existing ranges (see Section
3.3.1).
PRINCIPLE
PPCH-G 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 measurement and control 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 7.
A range set up using AutoRange and all its range specific settings, may be saved for later
recall using
[SETUP]
,
<1range>
(see Section 3.4.1). Saved ranges are available for
selection using
[RANGE]
(see Section 3.3.1). If a range created by AutoRange is not saved,
it is overwritten by the next AutoRange or erased when another range is selected or PPCH-G
power is turned OFF.
Use [AutoTest], <1QDUT> to AutoRange PPCH-G based on DUT tolerance (see Section 3.3.6.2).
Table 7.
Settings made by AutoRange
SETTING/SELECTION
PURPOSE
SET TO
SECTION
Unit
Set pressure unit of measure
Operator specified during
AutoRange
3.3.2
Mode
Set pressure measurement mode
(absolute, gauge)
Operator specified during
AutoRange
3.3.3
Full scale
Establish span maximum
Operator specified during
AutoRange
None
Q-RPT
Select most appropriate Q-RPT
to cover range
NOTE: User is
responsible for connecting
and disconnecting external Q-
RPTs, including protecting
them from overpressure when
using a higher range
Q-PRT with lowest default full
scale that is greater than the
AutoRange full scale
3.2.5
Upper limit
Set maximum pressure control
limit
Upper limit: 105 % of
AutoRange range or 102% of Q-
RPT default range, whichever is
lower
3.4.4
