3. OPERATION
Page 33
© 2009 DH Instruments, a Fluke Company
Figure 16.
Ramp pressure control operation
*Note that Figure 15 plots rate of change of pressure, not pressure.
PPCH includes a
Ready/Not Ready
feature that indicates when current pressure
control requirements have been met (see Section 3.2.3).
With ramp pressure control active, a
Ready
condition occurs whenever:
•
PPCH is controlling rate at the target rate value within the rate hold limit.
Figure 17 illustrates
Ready/Not Ready
operation in ramp control mode.
Figure 17.
Ready/Not Ready
in ramp pressure control mode
*Note that Figure 16 plots rate of change of pressure, not pressure.
