DH Instruments PPC3 - Page 120

PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 110
TP
Purpose To read the current target pressure.
Query “TP?”
Classic “TP”
Remarks The current target pressure is replied in the current pressure unit of measure.
Example
(enhanced)
Query sent:
Query reply:
“TP?”
“1000.00 kPa a”
Example
(classic)
Sent:
Reply:
“TP”
“1000.00 kPa a”
See Also “PS“
3.2.10
UCOEF
Purpose To convert 1 Pascal to the current pressure units.
Query “UCOEF?”
Classic “UCOEF”
Remarks The PPC3 handles all pressure values internally in Pascal. The coefficient replied is equivalent of
1 Pa in the current pressure unit of measure. This program message allows the user to convert
pressures
Example
(enhanced)
Query sent:
Query reply:
“UCOEF?”
“0.0010000000 kPa”
Example
(classic)
Sent:
Reply:
“UCOEF”
“0.0010000000 kPa”
See Also 3.3.2, 3.5.6, 7.2.1
UDU
Purpose Read or set the user defined pressure unit.
Command
Query
“UDU label, ucoef”
“UDU?”
Classic “UDU=label, ucoef”
“UDU”
label: User unit label (4 alphanumeric char maximum). It cannot be an already
supported unit label.
ucoef: “User unit conversion coefficient (units/Pa).
Default “UDU USER,1.0”
Remarks The user defined unit must be set up with the program message prior to remote or local
selection.
Example
(enhanced)
Cmd Sent:
Query reply:
“UDU MYUN, .001”
“MYUN, 0.0010” (No reply if GPIB-488)
Example
(enhanced)
Cmd Sent:
Query reply:
“UDU? MYUN, .001”
“MYUN, 0.0010”
Example
(enhanced)
Sent:
Reply:
“UDU=MYUN, .001”
“MYUN, 0.0010”
See Also 3.5.6, 3.3.2
UL
Purpose Read or set an upper limit for the current range.
Command
Query
“UL n”
“UL?”
Classic “UL=n”
“UL”
Arguments n: The upper limit pressure in the current pressure unit and measurement mode.
Remarks The PPC3 has an upper limit for each range and for each measurement mode (gauge and
absolute). New automated pressure control targets cannot be greater than this value. If the
pressure does exceed the upper limit, the pressure display flashes, and pressure control stops.
Manual increases in pressure are not allowed as long as the pressure is above the upper limit.
Decreases in pressure are allowed.
This feature should always be used to prevent accidental over pressure of a device under test.
Example
(enhanced)
Cmd sent:
Query reply:
“UL 1000”
“1000.00 kPaa” (No reply if GPIB-488)
Example
(enhanced)
Cmd sent:
Query reply:
“UL? 1000”
“1000.00 kPaa”
Example
(classic)
Sent:
Reply:
“UL=1000”
“1000.00 kPaa”
Errors ERR# 6: The argument is out of range.
See Also “LL”
3.4.4