DH Instruments PPC3 - Page 107

4. REMOTE OPERATION
Page 97 © 2002-2007 DH Instruments, a Fluke Company
LL(=)
Purpose Read or set the lower pressure limit for the active range and measurement mode (negative
gauge measurement mode only).
Command “LL n”
Classic “LL=n”
Arguments n: The lower pressure limit for the current pressure range in the current unit of
measure. Value is always a negative value of gauge pressure.
Remarks Negative gauge mode in PPC3 has a lower limit. New automated pressure control targets can not
be less than this value. If the pressure exceeds the lower limit, the pressure display flashes, and
pressure control is aborted. Manual decreases in pressure are not allowed as long as the pressure
is below the lower limit. Increases in pressure are allowed. This feature should always be used to
prevent accidental over (under) pressure of a device under test.
Example
(enhanced)
Cmd sent:
Reply:
“LL -4”
“-4 kPa g” (no reply if IEEE-488)
Example
(enhanced)
Cmd sent:
Reply:
“LL? -4”
“-4 kPa g”
Example
(classic)
Sent:
Reply:
“LL=-4”
“-4 kPa g”
Errors ERR# 6:
ERR# 23
The n argument is invalid.
The mode must be negative gauge to specify a lower limit.
See Also “UL”
3.4.4
LOCAL
Purpose Returns control to the PPC3 front panel.
Command “LOCAL”
Classic “LOCAL”
Remark The REMOTE program message can lock the front panel out completely. The user can return
to local operation by sending the LOCAL program message, sending the IEEE-488 ‘GTL’
command (if in enhanced format), or by cycling PPC3 power.
Example
(enhanced)
Cmd sent:
Reply:
“LOCAL”
“LOCAL” (no reply if IEEE-488)
Example
(enhanced)
Cmd sent:
Reply:
“LOCAL?”
“LOCAL”
Example
(classic)
Sent:
Reply:
“LOCAL”
“LOCAL”
See Also “REMOTE”
MEM
Purpose Read the status from the power-up memory test.
Query “MEM?”
Classic “MEM”
Remarks The PPC3 system memory stores the user settings (units, resolution, generation settings) and
retains them when the unit is OFF. On power-up, this memory is checked. If this memory is
corrupted, all user settings are reset to default , and the MEM status will be set to reflect this.
Example
(enhanced)
Query sent:
Reply:
“MEM?”
“0” PPC3 data corrupted and was set to factory defaults.
“1” The memory was found to be OK on power-up.
Example
(classic)
Sent:
Reply:
“MEM”
“MEM=0” PPC3 data corrupted and was set to factory defaults.
“MEM=1” The memory was found to be OK on power-up.
See Also 3.5.9