DH Instruments PPCK PLUS, Operation And Maintenance Manual

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PPCK+™ Operation and Maintenance Manual
Page 139
©2001 DH Instruments, Inc .
Measurement Mode Whether pressure is being measured relative to absolute zero or vacuum (absolute
mode) or relative to atmospheric pressure (gauge mode).
PA Pressure adder, used to offset an RPT range or barometer in calibration.
PM
Pressure multiplier, used to adjust span of an RPT range or barometer in
calibration.
Rate The rate of change of the current pressure. Indicated in the main run screen when
control is suspended.
Ready/Not Ready Indication used in automated control to indicate when control is complete and data
may be taken within control parameters.
RPM Reference pressure monitor manufactured by DHI . Models are RPM1, RPM2,
RPM3.
RPT (Reference
Pressure Transducer)
1. The transducer used by PPCK+ for high accuracy pressure measurement.
The RPT in a single RPT PPCK+ or the higher pressure range RPT in a dual
RPT PPCK+ is referred to as the Hi or primary RPT.
2. The lower pressure range RPT in a dual RPT PPCK+ is referred to as the Lo
RPT. RPTs are designated by a leading A or G (absolute or gauge) followed
by four numbers indicating the maximum range of the RPT in psi (e.g., A0100).
SPLT Self Purging Liquid Trap. An optional device to protect PPCK+ from liquid and
particulate contamination returned from a DUT.
Stability Limit
A limit expressed in units of pressure per second (e.g., psi/second). The stability
limit is used as the
Ready/Not Ready criterion. Ready if inside stability limit. Not
Ready if stability limit is exceeded.
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 attempts to set and maintain the
pressure.
Thermal Pressure
Control (TPC) Fine pressure adjustment by heating and cooling the pressurized gas using a
thermal pressure control unit (TPCU).
TPCU
Thermal pressure control unit, the assembly used for thermal pressure control.
UL Same as Upper Limit.
Upper Limit A range specific maximum value of pressure not be exceeded and at which PPCK+
will abort pressure setting and buzz.