PG7000™ OPERATION AND MAINTENANCE MANUAL
© 1998-2008 DH Instruments, a Fluke Company
Page 164
UNIT(=)
Purpose
Set or change the current pressure unit of measure and pressure measurement mode.
Syntax “UNIT=xxxxx”
“UNIT”
Default “UNIT=MPa
g”
“UNIT=kPa g”
Argument N/A
Remarks
The units in which PG7000 interprets and executes commands can be changed. The
available units are:
psi
g
psf g
bar g
mbarg
Pa g
kPa g
MPa g
MmHgg
InHgg
InWag
MmWag
kcm2g
psi a
psf a
bar a
mbara
Pa a
kPa a
MPa a
mmHga
inHga
inWaa
mmWaa
kcm2a
psi d
psf d
bar d
mbard
Pa d
kPa d
MPa d
mmHgd
inHgd
inWad
mmWad
kcm2d
Mm
(altitude available only with a vac reference)
Ft
(altitude available only with a vac reference)
Xxxxg xxxxa
Xxxxd
The gauge/absolute/differential trailing designator ‘g’, ‘a’ or ‘d’, always appears in the 5th
character position. The gauge unit trailing designator ‘g’ does not have to be given to
specify a gauge unit.
Example Typical
command:
Typical reply:
“UNIT=mbar”
“mbarg”
Error
See 9.3.2 Error Messages
ERR #1
ERR #20
Invalid unit specified
Vacuum must be enabled with absolute unit
See Also
3.9.3, 3.9.4, UDU, UCOEF, MMODE
VACPx(=)
Purpose
Set or read the source for the vacuum pressure measurement. Also optionally sets the
USER defined measurement. This command is only valid for PG7601.
Syntax “VACPx=source,
meas”
“VACPx=source”
“VACPx
Default INTERNAL
Argument
x:
The Setup number from 1 to 21. See the SETUP command.
Setup 21 is reserved for remote command use only.
source:
The measurement source. This can be INTERNAL, DEFAULT
(normal), USER, RPM or the user defined vacuum “label”
meas:
The current measurement used in Paa. This can only be set if
the source argument is USER. If specified, the limit for this
argument is 0 to 99 Paa.
Remarks
PG7601 has an internal vacuum pressure gauge that can be used as the source of values of
reference vacuum under the bell jar used in pressure calculations. You may also request that
another source be used for this measurement. The range of the internal gauge is 0 to 20 Paa.
The measurement source can be the internal gauge, a user defined fixed value, the
manufacturer’s fixed default value, an external
DHI
RPM or a user defined external vacuum
gauge. If an external RPM or a user defined external vacuum is chosen, you must setup
the COM2 port to the proper settings. It is also advised to set this up prior to selecting the
setup to make the device active. If you specify “RPM” or the user defined barometer “label”
, then all other barometer source setups set to “RPM” or the user defined barometer will
change to this source, as it is a global selection.
The SETUP function allows 19 separate source configurations for the various SETUP
variables to be saved in 19 files. The SETUP command selects which of the files to
make active. The SETUP command selects which of the 19 to use. Setup number 1 is
restricted as INTERNAL only to serve as a manufacturer’s fixed Setup, and cannot be changed.
Example Typical
command:
Typical reply:
“VACP2=USER,10”
USER, 10.0 Paa”
Typical
command:
Typical reply:
“VACP9=INTERNAL”
“INTERNAL, 13.2 Paa”
Error
See 9.3.2 Error Messages
ERR #1
ERR #2
ERR #3
The setup number x is invalid
The source argument is invalid
The meas argument is invalid
See Also
3.10, 3.11.5.5, SETUP, COM2, UDV