2 MEASurement Commands
120 N1911A/1912A P-Series Power Meters Programming Guide
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,
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
FETC1:DIFF:REL? DEF,3,(@2)
,(@1)
This command queries the upper
window/upper measurement relative
difference measurement of
Channel B - Channel A, using the current
sensor range and a resolution setting of 3
on both channels.
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