DH Instruments PPCH, Руководство по эксплуатации и обслуживанию

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PPCH™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 122
RS
Purpose Set a new target rate and start a new control cycle. Allows the test volume to be specified
which causes the pressure control cycle to be executed omitting the automated control
configuration routine.
Command “RS n (,v) ”
Classic “RS= n (,v) ”
Arguments n:
v:
The target rate in the current pressure units per second. Negative for
descending rates. The target rate cannot be ‘0’
The volume of the system connected to the PPCH TEST(+) port in cm
3
(cc).
This argument is optional and should be used only to reduce pressure-
setting time in known volumes.
Remarks The PPCH sets the specified target rate using the current control settings and mode. Control
continues until a new target rate or pressure is set, the upper limit is reached, the PPCH goes
into LOCAL mode, or an “ABORT” program message is executed.
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 PPCH does not attempt to perform its test volume
determination routine at the beginning of the pressure setting procedure, but instead uses the
volume specified for the pressure control. This can reduce pressure set times when operating
into a consistent volume. 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.
Example
(enhanced) Cmd sent:
Reply: “RS 10”
“10 kPa/s“
(no reply if IEEE-488)
Example
(enhanced) Cmd sent:
Reply: “RS? 1000”
“10 kPa/s“
Example
(classic) Sent:
Reply: “RS=10, 75” (includes test volume definition)
“10 kPa/s“
Errors ERR# 6
ERR# 8
ERR# 12
ERR# 55
The target rate is out of range.
Active external RPM4 timeout.
Pressure has exceeded maximum limits.
Harware malfunction, low reservoir
See Also “PR”, “PRR”, “STAT”, “SR”, “QPRR, UL”
3.2.2.5, 3.3.10.4, 3.2.1
SCRSAV
Purpose Read or set the front panel display screen saver activation time.
Command
Query “SCRSAV n ”
“SCRSAV?”
Classic “SCRSAV= n ”
“SCRSAV”
Arguments n: The inactivity period. (minutes) after which screen saver activates (0-99).
Default “SCRSAV 10”
Remarks The PPCH front panel will dim after a period of keyboard and remote inactivity. Setting this
value to ‘0’ disables this feature.
Example
(enhanced) Cmd sent:
Reply: “SCRSAV 30”
“30”
(No reply if GPIB-488)
Example
(enhanced) Cmd sent:
Reply: “SCRSAV? 30”
“30”
Example
(classic) Sent:
Reply: “SCRSAV=30”
“30”
Errors ERR# 6 The argument was invalid.
See Also 3.5.5.1
SN
Purpose To read the serial number of the PPCH.
Query “SN?”
Classic “SN”
Remarks
The PPCH is serialized. The serial number can be read using this program message.
Example
(enhanced) Query sent:
Reply: “SN?”
“321”
Example
(classic) Sent:
Reply: “SN”
“321”
See Also 3.5.5.4