E-DWT-H OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 116
Q-RPT
(Quartz Reference
Pressure Transducer)
The transducer used by the RPM4-E-DWT for low uncertainty pressure measurement.
May be designated as Hi or Lo depending on its position and role in the RPM4-E-DWT.
Q-RPTs are designated by a leading A, G or BG (absolute, gauge or bi-directional
gauge) followed by three numbers and a letter indicating the maximum range of the
Q-RPT in kPa (nnnK) or MPa (nnnM).
Rate
A DISPLAY function in which the rate of change of pressure in pressure unit/second is
displayed.
Ready/Not Ready
Front panel LED indication of when the pressure measured by RPM4-E-DWT’s active
Q-RPT is stable within the stability limit. Leading character of the second line when the
inactive Q-RPT is displayed on the second line in Q-RPT DISPLAY mode.
RPT2x
Parallel measurement mode in which both Q-RPTs of an RPM4-E-DWT with two
Q-RPTs are used together and the indicated pressure is the average of their
measurements.
SDS (Self Defense
System)
A system to protect Q-RPTs from overpressure made up of isolation and vent valves
and internal operating logic. SDS is not used in RPM4-E-DWT A70M/A7M-AF.
Span
The difference between FS and the lowest point in a range. For example, the span of a
100 kPa FS range in negative gauge mode is nominally 200 kPa (from - 100 kPa to 100 kPa).
Stability Limit
A limit expressed in units of pressure per second (e.g., kPa/second). The stability limit is used
as the
Ready/Not Ready
criterion.
Ready
if rate of change is less than stability limit.
Not Ready
if rate of change is greater than stability limit.
Target
The value from which deviations are measured in the Deviation DISPLAY function.
UL (Upper Limit)
A user settable maximum pressure limit. When pressure exceeds UL, RPM4-E-DWT beeps
intermittently. In negative gauge measurement mode, there is also a user settable lower limit.
User Level
Levels of security that can be set to protect certain RPM4-E-DWT functions from being
accessed.
QDUT
On-board automated test sequence that AutoRanges RPM4-E-DWT based on
characteristics of the Device Under Test (DUT).
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