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Changes the amplitude
The amplitude scale is changed from logarithmic (dB) to linear (volts) and
scale and span of the
the span is set to 0 Hertz to demodulate the signal and display time domain
analyzer
characteristics.
Measures the minimum
The analyzer measures the minimum level and the maximum level.
level and the maximum
The minimum level corresponds to the vertical interval test signal
level and calculates the
(VITS) white level and the maximum level corresponds to the horizontal
percentage of AM
synchronization-pulse (H-sync) level. The ratio of the minimum level (the
modulation depth
VITS white level) to the maximum level (the H-sync pulse level) subtracted
from a value of 1 and multiplied by 100 gives the percentage of modulation:
Figure 2-27 shows the analyzer measuring the minimum and maximum levels.
The depth of modulation result is displayed at the bottom of the screen.
1
m a x i m u m
AT 10 dB
I
CENTER
67.275 M H
Z
Figure 8-9. Measuring the Depth of Modulation
Depth of Modulation Test Description
MKR 3 9750 msec
10.314
I
I
I
I
SPAN 0 Hz
30.0 msec
Test Descriptions
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