PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 20
When pressure control is NOT active:
A
Ready
condition occurs any time NO control valve
is operating and the pressure rate of change is inside the stability limit. The stability limit is
defined in terms of rate of change of pressure in current pressure units per second.
When pressure control is active:
The criteria for determining the
Ready/Not Ready
condition depend on whether the current control mode is static or dynamic. Pressure
Ready/Not Ready
parameters are set by default when AutoRange is used, or a control mode
is selected. The parameters can be customized if desired (see Section 4.4.5.1 for Basic
Interface and Section 5.7.8.2.1 for Advanced Interface).
Dynamic Control Ready/Not Ready
With dynamic pressure control active, a
Ready
condition occurs whenever:
•
The current measured pressure is inside the hold limit.
Note
In dynamic control mode, it is common to assume that when a Ready
condition occurs (pressure inside the control hold limit), the measured
pressure equals the target pressure. For this reason, when the pressure is
Ready in dynamic control mode, the measured pressure display is equal to
the target pressure.
Figure 6. Ready/Not Ready
in Dynamic Pressure Control Mode
Static Control Ready/Not Ready
With static pressure control active a
Ready
condition occurs whenever:
•
NO control valve is operating.
•
The current measured pressure is at the target value within the hold limit.
•
The rate of change of pressure is less than the current stability limit.
Summary of Contents for PPC4
Page 70: ...PPC4 OPERATION AND MAINTENANCE MANUAL 2009 DH Instruments a Fluke Company Page 58 Notes...
Page 194: ...PPC4 OPERATION AND MAINTENANCE MANUAL 2009 DH Instruments a Fluke Company Page 182 Notes...
Page 226: ...PPC4 OPERATION AND MAINTENANCE MANUAL 2009 DH Instruments a Fluke Company Page 214 Notes...
