74 Chapter 2
Front-Panel Key Reference
Auto Couple
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:
Auto Couple, 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. When
Preset Type is set to
Factory, peak detection is selected at power on and by
pressing
Preset. When Peak detection is selected, Peak
appears in the upper-left corner of the display.
Key Access:
Auto Couple, Detector Auto Man
Sample
Sample detection is used primarily to display noise or
noise-like signals. This detection should not be used to
make the most accurate amplitude measurement of non
noise-like signals. In sample mode, the instantaneous
signal value at the present display point is placed in
memory. When
Sample detection is selected, Samp
appears in the upper-left corner of the display.
Key Access:
Auto Couple, Detector Auto Man
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