PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 150
Negative gauge,
compound 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).
P
offset
The difference between a Q-RPT reading and the AutoZero reference at the time AutoZ is
run. Used by the AutoZ function when Auto Z is ON to compensate Q-RPT readings for
changes in zero over time.
P
std,0
AutoZero reference value. Value indicated by the device against which the Q-RPT is
zeroed by AutoZ.
PA
Pressure adder, used to offset a Q-RPT, utility sensor or barometer to calibrate it.
PM
Pressure multiplier, used to adjust span of a Q-RPT, utility sensor or barometer to calibrate it.
Q-RPT
(Reference Pressure
Transducer)
1. The transducer used by PPC3 for low uncertainty pressure measurement. The Q-RPT
in a single Q-RPT PPC3, or the higher pressure range Q-RPT in a dual Q-RPT
PPC3,
is referred to as the Hi or Q-RPT.
2. The lower pressure range Q-RPT in a dual Q-RPT PPC3 is referred to as the Lo Q-
RPT.
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
The rate of change of the current measured pressure. Indicated in the MAIN RUN
screen when control is suspended.
Ready/Not Ready
Indication used to indicate when control PPC3 pressure meets specific criteria for
distance from target pressure and stability. Ready/Not Ready is indicated by an LED on
the PPC3 front panel and is used to determine when test readings should be taken.
RPM4
Reference Pressure Monitor manufactured by DHI. RPM4s can be set up to act as external
measurement devices to operate with PPC3.
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).
SPLT
Self Purging Liquid Trap. An optional device to automatically protect PPC3 from liquid
and particulate contamination returned from a DUT.
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.
Static Control
Control mode in which the pressure is set near the target value and then shut OFF and
allowed to evolve freely.
Target
The value to which automated pressure control sets and maintain the pressure.
UL
Same as Upper Limit.
Upper Limit
A range specific maximum value of pressure not be exceeded and at which PPC3 will abort
pressure setting and beep. In negative gauge measurement mode there is also a lower limit.
Utility Sensor
The internal, high (IuH) transducer in a PPC3 if when there is no Q-RPT in the IH position.
A utility sensor is a low accuracy pressure transducer used for pressure indication,
safety and housekeeping functions, not for low uncertainty measurement.
User Level
Levels of security that can be set to protect certain PPC3 functions from being accessed.
QDUT
On-board automated test sequence that AutoRanges PPC3 based on characteristics of
the Device Under Test (DUT).
X1H, X1L, X2H, X2L
External 1, Hi; External 1, Lo; External 2, Hi; External 2, Lo. Position designators of
Q-RPTs external to a PPC3 (in RPM4s) that have been connected to PPC3 and
initialized so that they can be used by PPC3 for pressure measurement.
“1” is the first RPM4 in the communications daisy chain and “2” is the second.
“Hi” is the Q-RPT in the RPM4 if there is only one or the one that has the highest full
scale default range if there are two.
“Lo” is the lower of the two Q-RPTs if there are two Q-RPTs in the RPM4.
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