Chapter 2 83
Front-Panel Key Reference
Det/Demod
Key Access: Det/Demod
Auto
The system selects peak detection as the default, but if
a condition arises where a different type of detection
scheme should be better utilized, the system will use
the alternate scheme. For example, the Marker Noise
function uses Average detection when in Auto mode
because the system determines that the data will be
more accurate for noise-type signals.
Key Access:
Det/Demod, Detector Auto Man
Average
Average detection is used when measuring the average
value of the amplitude across each trace interval
(bucket). The averaging method used by the Average
detector will be set to either Video or Power as
appropriate when the Average Type is Auto coupled or
may be set explicitly through the
BW/Avg, Avg Type Auto
Man
key.
Video Average detection computes the averaged trace
interval as appropriate to the Y-axis scale:
• Log-power average when in log scale.
• Voltage average when in linear scale.
• Frequency deviation when Demod View is enabled
for FM Demod.
Power Average (“root mean square” or RMS) detection
computes the RMS of the samples collected across the
trace interval. The number of samples included in the
RMS average for each trace interval depends on the
sweep time, the resolution bandwidth, and whether or
not option B7D is installed. With option B7D installed,
more samples are available as appropriate for wider
resolution bandwidths and faster sweep times. Slower
sweep times also increase the number of samples
averaged for each trace interval.
When
Average is selected, Avg appears on the left side
of the display.
Key Access:
Det/Demod, Detector Auto Man
Peak
Peak detection is used primarily when measuring
sinusoidal (spectral) components. Peak detection
obtains the maximum video signal value between the
last display point and the present display point and
stores this value in memory. Peak detection is selected
at power on and by pressing
Preset when Preset Type is
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