DH Instruments PPCH-G, Руководство по эксплуатации и обслуживанию

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3. OPERATION
Page 53 © 2007 DH Instruments, a Fluke Company
3.3.10.2 STATIC CONTROL MODE, [ENT/SET P]
If the PPCH-G is not set for static control, use
SPECIAL, <6control>
,
<2mode>
to select static control mode.
For best results, wait 5 with the PPCH-G vented before controlling pressure
when changing to or from standard dynamic control mode. This is to allow time for
the PPCH-G thermal pressure control unit to respond and stabilize.
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 in current pressure unit of measure.
20.007 MPa g HI
Target:40.0
Edit the target pressure value as desired.
A target pressure entry that exceeds the current upper limit (see Section
3.4.4) is not accepted. Negative values are not accepted. See Section 3.3.10.6 for
information on zero target value.
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.
2. Current control mode indicator. Flashes when
automated pressure control is active.
Character is
<S>
for static control.
<C>
is
appended if custom control parameters are in
use.
3. Target pressure value (
<T>
) when controlling
and condition is Not Ready . Pressure rate of
change
<R>
when within hold limit and waiting
for pressure stability.
38.979 MPa a HI
R 0.002/s S
Observe the Ready/Not Ready indicator LED (see Section 3.2.3) for indication of
when the controlled pressure is within the hold limit and stable. PPCH-G
continues controlling following static pressure control protocol (see Section
3.2.2.3) until automated pressure control is interrupted.
If PPCH-G is unable to control pressure or appears to control pressure poorly,
see Section 6 to troubleshoot.
See Section 3.4.6 for information on customizing pressure control
parameters.