Chapter 2 69
Front-Panel Key Reference
Auto Couple
Average Allows you to select between video and power (RMS)
averaging, via the
Average Type key.
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 and the resolution bandwidth. 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
Enables positive peak detection which displays the
maximum video signal detected during a sampling
interval. EMI measurements usually call for positive
peak detection. Peak detection is selected at power on
or by pressing
Preset. When Peak detection is selected,
Peak appears in the upper-left corner of the screen.
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.
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