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Front-Panel Key Reference
Marker
Accesses the following marker function menu keys listed below.
Function
Key Access:
Band Power
For best accuracy, set the video bandwidth to at least ten times the
NOTE
resolution bandwidth to minimize its averaging effect.
NOTE
Band Power
independent of signal level and marker placement.
Marker Noise
You can use
NOTE
sinusoidal signal (signal to noise). However, be sure to activate the
delta marker before pressing
may be incorrect.
118
,
Marker
More
Indicates the power over that part of the trace between
the reference and active markers. If only one marker is
present when you press
placed at the same location as the first marker. To
reposition the markers, press
and
keys. If
Span Pair
average detection is used for RBW ≥ 1 kHz, and Sample
detection is used for RBW < 1 KHz.
Key Access:
Marker
has no meaning in zero span, and the indicated value is
Reads out the average noise level, referenced to a 1 Hz
noise power bandwidth. If no marker is present, a
marker appears at the center of the display. When
Marker Noise is enabled in resolution bandwidths of
1 kHz and above, the auto coupled detector selection is
set to Average and the Avg Type is set to Power because
the tradeoff between sweeptime and variance of the
result is best with power Average detection. In
resolution bandwidths < 1 kHz, the auto coupled
detector selection is Sample. However, the Marker
Noise function generates appropriately corrected values
for all supported detetctor modes. If the marker delta
function is on and the noise marker is activated and
moved to measure the noise floor, the marker readout
will display the signal-to-noise ratio.
and
Delta
Marker Noise
Marker Noise
The noise marker averages 5% of the trace data values
(one-half a horizontal division), centered on the location
of the marker on the frequency or time scale. Marker
noise indicates noise power density per Hertz or noise
voltage per root Hertz depending upon the amplitude
units selected. The number of sweep points is noted in
parenthesis to the right of the sweep time in the lower
right corner of the graticule.
, a second marker is
Band Power
to access
Marker
is selected,
Detector (Auto)
,
,
More
Function
to indicate noise level relative to
or the reference marker units
Delta Pair
Chapter 2
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