2 MEASurement Commands
142 N1911A/1912A P-Series Power Meters Programming Guide
[a] 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.
[b] 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.
[c] 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.
– If the expected_value and resolution parameters are not the same as the
current expected value and resolution settings on the specified window,
error –221, “Settings conflict” occurs.
source list This channel list specifies the channels used to calculate the
ratio.
If unspecified and the current window setup is a ratio
measurement then this ratio setup is used, otherwise it
defaults to Channel A/B (N1912A) or A/A (N1911A).
(@1),(@2)
[c]
(@2),(@1)
[c]
(@1),(@1)
(@2),(@2)
[c]
Item Description/Default Range of Values
FETC2:RAT? DEF,1,(@1),(@2) This command queries the lower
window/upper measurement ratio
measurement of Channel A over
Channel B, using the current
sensor range and a resolution of 1
on both channels.
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