94 N9912A FieldFox User’s Guide
Then More.
Then Marker Function
Then Noise ON OFF.
Band/Interval Power Marker
A Band/Interval Power marker, unique to SA Mode, accumulates the power that
is measured over several adjacent data points (or ‘buckets’). The range of buckets
being measured is displayed with vertical posts around the marker. This Band
Span value is selectable.
This feature is very similar to a channel power measurement (page 97).
When the frequency span is set to Zero span, the marker is referred to as an
Interval marker because it averages power over a specific time interval. In this
case the range is specified as the Interval Span. Learn more about Zero span
measurements on page 86.
If the Detection method and Averaging type are set to Auto when you enable a
Band/Interval Power marker, the Detection method will change to Average
(RMS) and Averaging type will change to Power average. Other Detection
methods or Averaging type settings will usually cause measurement inaccuracy.
Learn more about Detection method on page 91, and Averaging Type on page 90.
Summary:
In Zero span, an Interval Power Marker yields the average power over the
specified time interval.
In non-Zero span, a Band Power Marker yields the total power over the
specified frequency range.
How to measure Band/Interval Power with a marker
Press Marker to create or select a Normal or Delta marker to use to measure
Band/Interval Power.
Then press More
Then Marker Function
Then Band/Int Power
Then Band (or Interval) Span
Then choose from the following:
o Auto Measures power over 5% of the displayed span, or ½ graticules. The
Band Span is automatically updated to remain at 5% when you change the
frequency span.
o Man Enter a frequency or time value using the ▲|▼ arrows or the rotary
knob, then press Enter. Or enter a value using the numeric keypad and
select a frequency or time suffix. The Band Span remains at the frequency or
time value that you set as the span changes.
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