Agilent Technologies N1911A Programming Manual page 148

2 MEASurement Commands
Example
FETC1:DIFF:REL? DEF,3,(@2)
,(@1)
Error Messages
• If the last measurement on either channel is not valid error –230,
120
Item Description/Default
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.
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
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.
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.
N1911A/1912A P-Series Power Meters Programming Guide
Range of Values
2
1 to 4
1.0, 0.1, 0.01, 0.001
1
DEF
3
(@1),(@2)
3
(@2),(@1)
(@1),(@1)
3
(@2),(@2)