Technical data

MEASurement Commands 2
N1911A/1912A P-Series Power Meters Programming Guide 117
1
The mnemonic DEF means DEFault. This is not equivalent to the DEFault parameter used in the
command sub-systems. The parameters must be entered in the specified order. If parameters are
omitted, they default from the right. The parameter DEFault is used as a place holder. Specifying
DEF leaves the parameter value unchanged.
2
When the measurement result is linear this parameter represents the number of significant
digits. When the measurement result is logarithmic 1 to 4 represents of 1, 0.1, 0.01 and 0.001
respectively.
3
N1912A only.
Example
Error Messages
• If the last measurement on either channel is not valid error –230,
“Data corrupt or stale” occurs. A measurement is valid after it has
been initiated. It becomes invalid when either a reset occurs or any
measurement parameter, for example frequency, is changed.
resolution A numeric value for the resolution. If it is
unspecified the current resolution setting is used. If
a value is entered it should correspond to the
current resolution setting otherwise an error
occurs.
1 to 4
2
1.0, 0.1, 0.01, 0.001
DEF
1
source list This channel list specifies the channels used to
calculate the difference.
If unspecified and the current window setup is a
difference measurement then this difference setup
is used, otherwise it defaults to Channel A-B
(N1912A) or A-A (N1911A).
(@1),(@2)
3
(@2),(@1)
3
(@1),(@1)
(@2),(@2)
3
Item Description/Default Range of Values
FETC2:DIFF? This command queries the difference
measurement on the lower window/lower
measurement.