3. OPERATION
Page 47 © 2002-2007 DH Instruments, a Fluke Company
3.3.10 [ENT/SET P] (SET PRESSURE AUTOMATICALLY)
PURPOSE
To use the automated pressure control functions of PPC3 to set and maintain target pressure
values.
OPERATION
The active range pressure control mode and parameters can be viewed and edited using
[SPECIAL], <6control> (see Section 3.4.6).
To set a pressure, press [ENT/SET P] from the MAIN RUN screen. The display is:
1. Standard MAIN RUN screen first line showing measured
pressure and active Q-RPT.
2. Edit field for the pressure control target pressure.
100.006 kPa g HI
Target:100.0
Edit the target pressure value as desired (see Section 3.3.10.2 for information on zero
pressure commands).
The [ ] and [ ] direct pressure control keys jog the target pressure up and down by
the jog step value (see Section 3.1.3).
Press [ENT/SET P] to start pressure control to the target pressure and return to the MAIN RUN
screen. The MAIN RUN screen when pressure control is active is:
1. Standard MAIN RUN screen first line showing measured
pressure and active Q-RPT. Shows target pressure value
when condition is Ready.
2. Current control mode indicator. Flashes when automated
pressure control is active. Character is <D> for dynamic
control, <S> for static control. <C> is appended if custom
control parameters are in use.
3. Current deviation from the target pressure (<D>) when in
dynamic control mode and condition is Ready. Target
pressure value (<T>) when controlling and condition is Not
Ready. Pressure rate of change <R> when in static control
mode and waiting for stability.
500.000 kPa a HI
D 0.002 D
Observe the Ready/Not Ready indicator LED (see Section 3.2.2) for indication of when the
controlled pressure has reached the target and stabilized. PPC3 continues controlling
following static or dynamic control operation protocol (see Section 3.2.1) until automated
pressure control is interrupted.
A target pressure entry that exceeds the current upper limit (see Section 3.4.4) or that
is out of range will not be accepted as the target value.
If PPC3 is unable to control pressure or appears to control pressure poorly, see Section 6
to troubleshoot.
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