Technical data

Marker Fctn 12
Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz 223
Band/Intvl Power
Measures the power in a bandwidth (non-zero span) or time interval (zero span) specified
by the user. If no marker is on, this key activates the delta pair marker mode. If the detector
mode is set to Auto, the average detector is selected. If the Avg/VBW type is set to Auto,
Power Averaging is selected, other choices of detector and Avg/VBW type will usually
cause measurement inaccuracy. The active marker pair indicate the edges of the band. Only
Delta Pair and Span Pair marker control modes can be used while in this function, selecting
any other mode (for example, Normal or Delta) turns off this function.
The repeatability of your band power marker measurement can be impacted by the current
number of sweep points being used. If you only have a few sweep points in the
measurement band of interest, then small changes will have a direct impact on the
measurement result. Increasing your number of sweep points will decrease that affect and
improve the repeatability.
Key Path: Marker Fctn
Dependencies/Couplings: Video triggering is not available when the detector is
Average, therefore, marker functions that would set the detector to Average, and thus
conflict with video triggering, are not available when the Video trigger is On.
Selecting Band/Intvl Power when the marker control function is off, normal, or delta will
set the marker control function to delta pair.
Your band power marker measurement accuracy and repeatability can be degraded if you
are using a small number of sweep points. For example, if you are using 100 sweep points
and making a very narrow band measurement, relative to the current span (<5% of span),
the calculation uses only a couple of the sweep points. A more accurate/repeatable
calculation is done if you increase the number of sweep points, or if you can reduce the
span.
Remote Command:
See “Marker Fctn" on page 219 for the command to select a function.Example:
CALC:MARK:FUNC BPOW turns on marker one as a band power
marker.
CALC:MARK:Y? returns the value of the Band/Intvl Power function for marker 1 (if
Band/Intvl Power is ON for marker 1).