PPC2+™ Operation and Maintenance Manual
Page 101
©2001 DH Instruments, Inc.
PS
Purpose
Set a new target pressure and start a new pressure generation cycle. Allows the test
volume to be specified which causes the pressure generation cycle to be executed
omitting the automated control configuration routine.
Command
“PS
n (,v)”
Classic “PS=
n (,v)”
Arguments
n:
v:
The target pressure in the current pressure units.
The device under test volume in cc (optional, only available on
PPC2+ Ver. 2.00e or higher).
Remarks
The PPC2+ will generate the given target pressure using the current generation
settings and mode. Generation will continue until a new target pressure is set, the
PPC2+ goes into LOCAL mode, or an “ABORT” program message is executed.
If the given target is ‘0’ and the pressure units are gauge, the PPC2+ will vent.
The “PR?”, “PRR?”, “STAT?”, or “SR?” program message queries can be used to
monitor the progress of the generation.
If the optional “
v” argument is used, the PPC2+ will not attempt to self configure itself
to the volume under test, but instead will use the given volume for the pressure
generation. This can reduce pressure set times when operating into a consistent
volume since the configuration routine takes 5 to 6 seconds to execute. The “v”
argument should only be used in automated conditions, where the test volume is
constant and the unit configuration does not change. This argument is only a coarse
value, and it may be adjusted empirically for correct operation. A higher “v” setting
will speed up the generation with a greater chance of control overshoot, and a lower
“v” setting will slow down the generation. Note: with PPC2+ BG0002, the volume
size specified is the difference in volume form the 840 cc accessory volume.
Example
(enhanced)
Cmd sent:
Reply:
“PS 1000”
“1000.000 kPa a (no reply if IEEE-488)
Example
(classic)
Sent:
Reply:
“PS=1000”
“1000.000 kPa a
Errors
ERR# 6
The target pressure is out of range.
See Also
Sections 3.1.2.3, 3.2.3, “PR?”, “PRR?”, “STAT?”, and “SR?” program messages
PSF
Purpose
Set a new target pressure and use just the fast speed to generate the pressure.
Command “PSF
n”
Classic “PSF=
n”
Arguments
n:
The target pressure in the current pressure units.
Remarks
The PPC2+ will generate the given target pressure using just the fast speed, and will
stop generating when the pressure has reached or passed the given target. The
system will not attempt to hold the pressure.
The “PR?”, “PRR?”, “STAT?”, or “SR?” program message queries can be used to
monitor the progress of the generation.
Example
(enhanced)
Cmd sent:
Reply:
“PSF 1000”
“1000.000 kPaa (no reply if IEEE-488)
Example
(classic)
Sent:
Reply:
“PSF=1000”
“1000.000 kPaa
Errors
ERR# 6
The target pressure is out of range.
See Also
“PR”, “PRR”, “STAT”, “SR”, “PSS”
Summary of Contents for PPC2+
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