DH Instruments PPC3 - Page 100

PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 90
ATM
Purpose Reads the next measured pressure from PPC3’s on-board barometer (if present).
Query
Classic
“ATM?”
“ATM”
Remarks The atmospheric pressure as measured by the PPC3 on-board barometer is returned in
the current pressure units (always absolute). This measurement is followed by the units
text. Not all PPC3s are equipped with an on-board barometer.
Example
(enhanced)
Query sent:
Query reply:
“ATM?”
“97.12348 kPaa”
Example
(classic)
Sent:
Reply:
“ATM”
“97.12384 kPaa”
Errors ERR# 23: PPC3 is not equipped with a barometer.
See Also 3.5.7.3
AUTOPURGE
Purpose Read or set the status of the automatic purge function.
Command
Query
“AUTOPURGE n”
“AUTOPURGE?”
Classic “AUTOPURGE=n”
“AUTOPURGE”
Default “AUTOPURGE 0”
Arguments n: ’0’ To disable AUTO mode.
’1’ To enable AUTO mode.
Remarks The PPC3 can automatically control the external SPLT functions to purge the test system
before running a test, if desired.
Example
(enhanced)
Cmd sent:
Query reply:
“AUTOPURGE 1”
“1” (No reply if GPIB-488)
Example
(enhanced)
Cmd sent:
Query reply:
“AUTOPURGE 1”
“1”
Example
(classic)
Sent:
Query reply:
“AUTOPURGE=1”
“AUTOPURGE=0”
Errors ERR# 6: The argument was other than a ‘0’ or a ‘1’.
See 3.3.8, 3.5.7.4
AUTOVAC
Purpose Read or set the status of the automated Control Ref determination mode.
Command
Query
“AUTOVAC n”
“AUTOVAC?”
Classic “AUTOVAC=n”
“AUTOVAC”
Default “AUTOVAC 1”
Arguments n: ’0’ To disable AUTO mode. (“VAC” cmd determines status)
’1’ To enable AUTO mode. This will override the manual selection.
Remarks At low pressures, PPC3 control is affected by whether the EXHAUST port is open to
atmosphere or connected to vacuum. The PPC3 has an internal sensor that can be used
to automatically determine if the EXHAUST port is open to atmosphere or to a vacuum.
You can disable it to manually override it. It is recommended to use the “VAC” command
to disable this feature instead of the “AUTOVAC=0” command, as you can also specify
vacuum or atmospheric reference at the same time with the VAC command.
Example
(enhanced)
Cmd sent:
Query reply:
“AUTOVAC 1”
“1” (No reply if GPIB-488)
Example
(enhanced)
Cmd sent:
Query reply:
“AUTOVAC 1”
“1”
Example
(classic)
Sent:
Query reply:
“AUTOVAC=0”
“AUTOVAC=0”
Errors ERR# 6: The argument was other than a ‘0’ or a ‘1’.
See Also “VAC”
3.5.7.2