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3. OPERATION
Page 31 © 2004-2007 DH Instruments, a Fluke Company
The AutoRange function simplifies the task of selecting the Q-RPT best suited to cover a
specific test range and setting measurement 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 recall
using [SETUP], <1range> (see Section 3.4.1). Saved ranges are available for later 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.
Press [ENT] from the main run screen in RATE mode to use the [AutoTest] function to
AutoRange RPM4 based on DUT tolerance (see Section 3.3.10).
Table 6. 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, negative gauge)
Operator specified during
AutoRange
3.3.3
Full scale Establish span maximum Operator specified during
AutoRange
None
AutoRange span Basis of span based setting
calculations
Absolute mode: Zero absolute
to AutoRange full scale
Gauge mode: Zero gauge to
AutoRange full scale
Negative gauge mode: Minus
atmosphere to AutoRange full
scale (negative equivalent of full
scale on BG15K Q-RPT).
None
Q-RPT Select most appropriate Q-RPT
to cover range and mode.
Absolute and negative gauge
mode: Axxx Q-PRT with lowest
default full scale that is greater
than the AutoRange full scale
Gauge mode: Q-RPT with
lowest span whose full scale is
greater than AutoRange full
scale, Gxxx over Axxx if spans
are equal.
1.2.2.1
Upper limit
Lower limit
Set maximum and minimum
pressure alarm limits.
Upper limit: 105 % of operator
entered full scale pressure
Lower limit: None in absolute
and gauge modes. Minus
atmosphere in negative gauge
mode, minus equivalent of upper
limit in negative gauge mode on
a BG15K Q-RPT. Minus 66 kPa
(9.6 psi) with BA100K.
3.4.4
Resolution Set display resolution 10 ppm of AutoRange span or
1 ppm of default Q-RPT span,
whichever is larger.
3.4.2
Stability Limit Set Ready/Not Ready stability
criterion.
50 ppm of AutoRange span or 2
ppm of default Q-RPT span,
whichever is larger.
3.4.3,
3.3.4
Q-RPT turn down
(Premium class Q-RPTs only)
Turn down Q-RPT
characterization to improve
measurement uncertainty when
span is reduced
See RPM4 pressure
measurement specifications
1.2.2.1