2 MEASurement Commands
112 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.
Example
Error Messages
• If the last measurement 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.
• If the expected_value and resolution parameters are not the same as
the current expected value and resolution setting on the specified
window, error –221, “Settings conflict” occurs.
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 The channel which the command is
implemented on. If unspecified the current
window setup is used. However, on the
N1912A, if the window shows a ratio or
difference measurement, the upper window
defaults to Channel A and the lower window
to Channel B.
(@1)
(@2) (N1912A only)
Item Description/Default Range of Values
FETC2:POW:AC? This command queries the lower
window/upper measurement result.
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