4. REMOTE OPERATION
Page 111 © 2002-2007 DH Instruments, a Fluke Company
UNIT
Purpose Read or set the pressure unit of measure unit and measurement mode.
Command
Query
“UNIT unit (, ref”)”
“UNIT unitg (, ref”)”
“UNIT unita (, ref”)”
“UNIT?”
Classic “UNIT=unit (, ref”)”
“UNIT=unitg (, ref”)”
“UNIT=unita (, ref”)”
“UNIT”
Arguments unit:
ref:
The text corresponding to the pressure unit of measure.
The optional unit reference temperature only if the unit is “InWa”.
Remarks This program message determines what unit of measure and what measurement mode is
used to display pressure values. Refer to Table 13 for a detailed list of the units available and
their labels.
The unit text must be followed by ‘a’ if absolute measurement mode is desired, or gauge mode is
assumed. The unit text can optionally be followed by a ‘g’ to specify gauge measurement
mode. There can be a space between the unit text and the ‘a’ or the ‘g’.
If the unit specified is “InWa”, an optional second argument “ref” can be set. The “ref” can be
4, 20, or 60 corresponding to InWa at 4 °C, 20 °C or 60 °F. If this second argument is not
given when the unit is “InWa”, then the reference temperature is assumed to be 20 °C. The
reference temperature can also be added directly onto the end of the Unit argument if desired
(“inWa4”, “inWa20” or “inWa60” corresponding to inWa at 4 °C, 20 °C or 60 °F)
The fifth character of the reply is always ‘a’ for absolute mode, or ‘g’ for gauge mode. White
spaces proceed this character if needed. The temperature reference is added to the reply
only if the unit is “InWa”.
“MMODE” must be used to set the measurement mode to negative gauge. The “MODE”
command can also be used to set the desired measurement mode only.
Example
(enhanced)
Cmd sent:
Query reply:
Sent:
Query reply:
Sent:
Query reply:
“UNIT kPaa”
“kPaa”
“UNIT InWag, 4”
“inWag, 4”
“UNIT InWag60”
“inWag, 60”
Example
(classic)
Sent:
Reply:
Sent:
Reply:
“UNIT=kPaa”
“kPaa”
“UNIT=InWag, 4”
“inWag, 4”
Errors ERR# 7:
ERR# 6:
ERR# 20:
The unit is invalid.
The ref is invalid.
Absolute measurement mode and altitude units are not allowed with a gauge Q-
RPT.
See Also “MMODE”, “MODE”
3.3.2, 3.3.3
VAC
Purpose Read or set the status of the PPC3 EXHAUST port vacuum or atmosphere monitoring system.
Command
Query
“VAC n”
“VAC?”
Classic “VAC=n”
“VAC”
Default “VAC 0”
Arguments n: ’0’ To disable auto mode and specify that the PPC3 EXHAUST port is open
to atmosphere.
’1’ To disable auto mode and specify that the PPC3 EXHAUST port is
connected to a vacuum source.
NOTE: Use “AUTOVAC” to enable automated determination of EXHAUST
port conditions.
Remarks The PPC3 has an internal sensor that determines if the EXHAUST port is open to atmosphere
or to vacuum. You can manually override it if desired. The query can also be used to see the
sensor status (if auto is enabled). If the auto function is disabled, then the query returns the
last VAC setting.
Example
(enhanced)
Cmd sent:
Query reply:
“VAC 1”
“1” (No reply if GPIB-488)
Example
(enhanced)
Cmd sent:
Query reply:
“VAC? 1”
“1”
Example
(classic)
Sent:
Query reply:
“VAC=1”
“VAC=1”
Errors ERR# 6: The argument is not a ‘0’ or a ‘1’.
See Also “AUTOVAC”
3.5.7.2
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