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RPM4/HPMS A70M/A20M-AF OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company Page 28
PRINCIPLE
RPM4 A70M/A20M-AF is designed to support the calibration and test of a very wide variety of
test ranges in absolute and gauge measurement modes.
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 that specific 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 4.
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 DISPLAY mode to use the [AutoTest]
function to AutoRange RPM4 based on DUT tolerance (see Section 3.3.10).
Table 4. Settings made by AutoRange
SETTING/
SELECTION
PURPOSE
SETTING BY
[AUTORANGE]
SETTING BY
[AUTOTEST[
(see Section 3.3.10)
RELATED
SECTION
Unit Set pressure unit of
measure
Operator specified
during AutoRange
Operator specified in
AutoTest definition
3.3.2
Mode Set pressure
measurement mode
(absolute, gauge)
Operator specified
during AutoRange
Operator specified in
AutoTest definition
3.3.3
Full scale Establish span
maximum
Operator specified
during AutoRange
Maximum pressure of
AutoTest definition
None
Q-RPT Select most
appropriate Q-RPT to
cover range and mode.
Q-PRT with lowest
default full scale that is
greater than the
AutoRange full scale
Q-PRT with lowest
default full scale that is
greater than the
maximum pressure of
AutoTest definition
1.2.2.1
Upper limit Set maximum pressure
alarm limit.
105 % of AutoRange
full scale pressure
105% of maximum
pressure of AutoTest
definition
3.4.4
Resolution Set display resolution 10 ppm of AutoRange
span or
1 ppm of default Q-
RPT span, whichever is
larger
10% of DUT tolerance
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
10% of DUT tolerance
or
2 ppm of default Q-
RPT span, whichever is
larger
3.4.3,
3.2.1