DH Instruments PPC4, Operation And Maintenance Manual

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6. REMOTE OPERATION
Page 171 © 2009 DH Instruments, a Fluke Company
UDUn
Purpose Read or set the user defined pressure units.
Command
Query
“UDU n label, ucoef ”
“UDU n ?”
Classic “UDU n = label, ucoef ”
“UDU n ”
label: User unit label (5 alphanumeric char maximum). It cannot be an already
supported unit label.
ucoef : “User unit conversion coefficient (units/Pa).
Arguments n: The optional user defined unit to access (1 to 5). Assumes ‘1’ if not given.
Default “UDU USER,1.0”
Remarks The user defined unit must be set up with this command prior to remote or local selection.
There are 5 separate user definable units. The GUI supports all 5 user defined user units,
while the basic version only has access to the first one (
n = 1)
Example
(enhanced)
Cmd Sent:
Query reply:
“UDU MYUN, .001”
“MYUN, 0.001000” (No reply if IEEE-488)
Example
(enhanced)
Cmd Sent:
Query reply:
“UDU? MYUN, .001”
“MYUN, 0.001000”
Example
(classic)
Sent:
Reply:
“UDU=MYUN, .001”
“MYUN, 0.001000”
Example
(classic)
Sent:
Reply:
“UDU2=UN2, .01”
“UN2, 0.010000”
See Also 3.2.10
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 PPC4 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 IEEE-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”
3.2.21