9. GLOSSARY
Page 149 © 2002-2007 DH Instruments, a Fluke Company
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G
G
L
L
O
O
S
S
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A
A
R
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Y
Y
Axxx
A type of Q-RPT with a built-in vacuum reference that is intrinsically absolute (e.g. A10M).
Axxx Q-RPTs support absolute, gauge and negative gauge measurement modes.
Absolute Mode
Measurement mode in which the Q-RPT indicates absolute pressure (difference from vacuum).
AutoRange
A function that optimizes PPC3 measurement and control for a specific, user defined
range of operation.
AutoRanged Range
A PPC3 range created using the AutoRange function.
AutoTest or ATest
PPC3 on-board automated testing sequences and their results.
AutoZero or AutoZ
A process by which a Q-RPT and measurement mode is rezeroed (offset) relative to a standard.
Barometer
PPC3’s on-board atmospheric pressure measuring sensor. Also referred to as on-board
barometer.
BGxxx
A type of Q-RPT that is intrinsically gauge and is capable of operating bi-directionally,
above and below atmosphere, through zero). BGxxx Q-RPTs support gauge and negative
gauge measurement modes.
Bi-directional Gauge
Measurement mode in which the Q-RPT indicates gauge pressure (difference from
atmospheric pressure), in both positive and negative directions (above and below atmosphere)
Control Mode
Type of automated pressure control (static or dynamic).
Control Parameters
Parameters affecting pressure control and the Ready/Not Ready determination (target,
hold limit, stability limit).
Custom Control
Automated pressure control in which the control parameters are not the default control
parameters.
Default Range (DF)
A Q-RPT or utility sensor’s maximum range that is always available on [RANGE] and
cannot be deleted.
Deviation
The deviation of the current pressure from the target pressure control value. Indicated in
MAIN RUN screen when in dynamic control mode.
DUT
Device Under Test. The device or devices pneumatically connected to the PPC3 TEST
port that the PPC3 is being used to test or calibrate.
Dynamic Control
Control mode in which the pressure is constantly adjusted to remain as close as
possible to the target value.
External device or
External Q-RPT
A Q-RPT in an RPM4 external to PPC3 used by PPC3 for precise pressure measurement.
FS
Abbreviation of “full scale”. The full scale value is the maximum pressure or the span of
a measurement range. Limits and specifications are often expressed as % FS.
Gxxx
A type of Q-RPT that is intrinsically gauge but only measures pressure greater than
atmosphere. Gxxx Q-RPTs support gauge measurement mode only.
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 PPC3 reference level and the DUT.
Hold Limit
An automated pressure control parameter. Maximum acceptable difference between the
current pressure and the target pressure value.
IH or IuH
Internal, Hi. The Q-RPT (IH) or utility sensor (IuH) internal to PPC3 if there is only one
or, if there are two, the one that has the highest full scale default range.
IL
Internal, Lo. Refers to a Q-RPT internal to the PPC3 that is the lower of the two if there
is a second Q-RPT or utility sensor in the PPC3.
Measurement Mode
Whether pressure is being measured relative to absolute zero or vacuum (absolute mode)
or relative to atmospheric pressure (gauge mode).
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