9. GLOSSARY
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© 2008 DH Instruments, a Fluke Company
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Active Q-RPT
The Q-RPT that is currently selected to be displayed on the top line of the
RPM4-E-DWT display. Most function selections affect the active Q-RPT.
AutoRange
A function that optimizes RPM4-E-DWT measurement and control for a specific, user
defined range of operation.
AutoRanged Range
An RPM4-E-DWT pressure measurement range created using the AutoRange function.
AutoTest or ATest
RPM4-E-DWT on-board automated testing sequences and their results.
AutoZero or AutoZ
A process by which a Q-RPT is rezeroed (offset) relative to a standard.
Barometer
RPM4-E-DWT’s on-board atmospheric pressure measuring sensor. Also referred to as on-board
barometer.
CCW
Counter clockwise.
CW
Clockwise.
Default Range (DF)
A Q-RPT’s maximum range that is always available using
[RANGE]
and cannot be deleted.
Deviation
A DISPLAY function in which the deviation of the current pressure from a target pressure
is displayed.
DUT
Device Under Test. The device or devices pneumatically connected to the
RPM4-E-DWT
TEST(+)
port that the RPM4-E-DWT is being used to test or calibrate.
FS
Abbreviation of “full scale”. The full scale value is the maximum pressure of a measurement
range. Limits and specifications are often expressed as % FS. Also see span.
Gauge Mode
Measurement mode in which the Q-RPT indicates gauge pressure (difference from
atmospheric pressure), but only in the positive direction (above atmosphere).
Head
A difference in height between the RPM4-E-DWT reference level and the DUT.
HiLo
A DISPLAY function in which the highest and lowest pressure measurements since
reset are recorded and displayed.
Hi Q-RPT
The designation of a single Q-RPT in an RPM4-E-DWT, or, if there are two, the one that
has the highest full scale default range. This is the A70M (10 000 psi) in the
RPM4-E-DWT A70M/A7M-AF.
E-DWT
Electronic deadweight tester. A pressure calibration system in which the traditional
piston-cylinder and mass set of a deadweight tester are replaced with an electronic,
transducer based reference pressure monitor (RPM4-E-DWT).
Inactive Q-RPT
In an RPM4-E-DWT with two Q-RPTs, the Q-RPT that is not currently displayed on the
top line of the display. The inactive Q-RPT may be displayed on the second line of the
RPM4-E-DWT display using the Q-RPT DISPLAY function.
Lo Q-RPT
The designation of a the Q-RPT with the lower full scale default range in RPM4-E-DWTs
with two Q-RPTs. This is the A7M (1 000 psi) in the RPM4-E-DWT A70M/A7M-AF.
P
offset
The difference between a Q-RPT reading and the AutoZero reference at the time AutoZ
is run. Used by the AutoZ function to compensate Q-RPT readings for zero drift over
time.
P
std,0
AutoZero reference value. Atmospheric pressure (zero gauge) for RPM4-E-DWT
A70M/A7M-AF.
PA
Pressure adder, used to offset a Q-RPT or barometer to calibrate it.
PM
Pressure multiplier, used to adjust span of a Q-RPT or barometer to calibrate it.
Pmax!
The maximum pressure limit of a Q-RPT. If the pressure measured by the Q-RPT
exceeds Pmax!, an overpressure condition occurs.
