PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 102
PRR
Purpose Read the next available pressure, rate and on-board barometer reading.
Query “PRR?”
Classic “PRR”
Remarks The next available Ready condition, Q-RPT or utility sensor pressure, rate of pressure change,
and barometric pressure is replied in the current pressure unit of measure. 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 active Q-RPT or utility sensor in the current
pressure unit. This is followed by the current pressure unit.
rate: The measured rate of pressure change for the active Q-RPT or utility sensor
in the current pressure unit 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 (and always absolute). This is followed by the current
pressure unit. Not all PPC3s are equipped with an on-board barometer.
This field is missing if the PPC3 is not equipped with an on-board barometer.
After receiving this program message query, the PPC3 replies back with the
data once a new pressure measurement cycle is complete. This can take
up to 1.5 seconds.
Example
(enhanced)
Query sent:
Query reply:
“PRR?”
“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:
“PRR”
“R,2306.265 kPaa,0.011 kPa/s,97.000 kPaa”
See Also “PR”, “QPRR”, “SR”
3.1.1, 3.5.7.3
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 volume of the system connected to the PPC3 TEST(+) port in cm
3
(cc).
This argument is optional and should be used only to reduce pressure
setting time in know volumes.
Remarks The PPC3 sets the specified target pressure using the current control settings and mode.
Control continues until a new target pressure is set, the PPC3 goes into LOCAL mode, or an
“ABORT” program message is executed. If the given target is ‘0’ and the pressure units are
gauge, the PPC3 vents.
The “PR?”, “PRR?”, “STAT?”, or “SR?” program message queries can be used to monitor the
progress of the pressure setting routine.
If the optional “v” argument is used, the PPC3 does not perform its test volume determination
routine at the beginning of the pressure setting procedure, but instead uses the volume
specified 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 configuration does not change. This argument is only an approximation value, and it may
be adjusted empirically for correct operation. A higher “v” setting speeds up the generation
with a higher risk of significant control overshoot. A lower “v” setting slows down the
generation and reduces overshoot. Note: When using a BG15K low gauge pressure Q-RPT with
a DVU, the volume size specified should NOT include the DVU volume.
Example
(enhanced)
Cmd sent:
Reply:
“PS 1000”
“1000.000 kPa a “ (no reply if IEEE-488)
Example
(enhanced)
Cmd sent:
Reply:
“PS? 1000”
“1000.000 kPa a “
Example
(classic)
Sent:
Reply:
“PS=1000, 75” (includes test volume definintion)
“1000.000 kPa a “
Errors ERR# 6 The target pressure is out of range.
See Also “PR”, “PRR”, “STAT”, “SR”, “QPRR”
3.2.1, 3.3.10
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