DH Instruments PPCK PLUS, Operation And Maintenance Manual

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PPCK+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc .
Page 138
7.3 GLOSSARY
Absolute Mode
Measurement mode in which the RPT indicates absolute pressure (difference from
vacuum).
Atm Ref The on-board barometer reading.
ATMOFFSET The difference between the reading of the on-board barometer at the last tare and
the current reading of the on-board barometer. Used to dynamically compensate
the atmospheric offset (ZOFFSET) when operating in gauge measurement and
mode with an absolute RPT and AutoZ ON.
Autozero A process by which an RPT range and measurement mode is rezeroed (offset)
relative to a standard.
Barometer PPCK+'s on-board atmospheric pressure measuring sensor. Also referred to as
on-board barometer.
Control Mode
The type of pressure control that is active (static or dynamic pressure control).
Control Parameter 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.
Deviation The deviation of the current pressure from the target pressure control value.
Indicated in main run screen when in dynamic control mode.
Drive Air
Pneumatic power used to actuate PPCK+’s high pressure valves.
DUT Device Under Test. The device or devices pneumatically connected to the PPCK+
TEST port that the PPCK+ 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.
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.
Gauge Mode
Measurement mode in which the RPT indicates gauge pressure (difference from
atmospheric pressure).
Head A difference in height between the PPCK+ reference level and the DUT.
Hold Limit An automated pressure control parameter. Maximum acceptable difference
between the current pressure and the target pressure value.