DH Instruments PPC3 - Page 113

4. REMOTE OPERATION
Page 103 © 2002-2007 DH Instruments, a Fluke Company
PSF
Purpose Set a new target pressure, using only the fast control valve(s) and aborting pressure control
once the pressure target is reached..
Command “PSF n”
Classic “PSF=n”
Arguments N: The target pressure in the current pressure unit of measure.
Remarks The PPC3 sets the given target pressure using just the fast speed, and stops controlling when
the pressure has reached or passed the given target. The system does not attempt to
maintain the target 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”, “PS”
Figure 12
PSS
Purpose Set a new target pressure using only the slow control valve(s) and aborting pressure control
once the target is reached.
Command “PSS n”
Classic “PSS=n”
Arguments N: The target pressure in the current pressure units.
Remarks The PPC3 sets the given target pressure using just the slow speed, and stops controlling
when the pressure has reached or passed the given target. The system does not attempt to
maintain the target pressure.
The “PR?”, “PRR?”, “STAT?”, or “SR?” program message can be used to monitor the
progress of the generation.
Example
(enhanced)
Cmd sent:
Reply:
“PSS 1000”
“1000.000 kPaa” (no reply if IEEE-488)
Example
(enhanced)
Cmd sent:
Reply:
“PSS? 1000”
“1000.000 kPaa”
Example
(classic)
Sent:
Reply:
“PSS=1000”
“1000.000 kPaa”
Errors ERR# 6 The target pressure is out of range.
See Also “PR”, “PRR”, “STAT”, “SR”, “PSF”, “PS”
Figure 12
QPRR
Purpose Read the last RPT pressure, pressure rate and on-board barometer output as quickly as
possible.
Query “QPRR?”
Classic “QPRR”
Remarks The last measured Ready/Not Ready condition, active Q-RPT or utility sensor pressure, rate of
pressure change, and barometric pressure is replied in the current pressure unit of measure.
This program message is useful when a rapid response of measured pressure is needed.
Each data field is separated by a comma, and is returned in the following order:
ready, pressure UNITS, rate UNITS/s, atm UNITS
Here are the field descriptions:
ready: ‘R’ if the current pressure Ready criteria has been met,
‘NR’ if the criteria has not been met (see the “SR” program message).
pressure: The measured pressure for the selected Q-RPT or utility sensor in the current
pressure units. This is followed by the current pressure unit and measurement mode.
rate: The measured rate of pressure change for the active Q-RPT or utility sensor
in the current unit of pressure per second. This is followed by the current
pressure unit of measure.
atm: The pressure measured by the PPC3 on-board barometer in the current
pressure unit (but always absolute). This is followed by the current pressure
unit. Not all PPC3s are equipped with an on-board barometer. This field is
missing the PPC3 is not equipped with a barometer.
Example
(enhanced)
Query sent:
Query reply:
“QPRR?”
“R,2306.265 kPaa,0.011 kPa/s,97.000 kPaa”
“R,2306.265 kPaa,0.011 kPa/s” (no barometer)
Example
(classic)
Query sent:
Reply:
“QPRR”
“R,2306.265 kPaa,0.011 kPa/s,97.000 kPaa”
See Also “PR”, “PRR”, “SR”
3.1.1, 3.5.7.3