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MARKER
Example
Set up m on the peaks of a fundamental (left) and
its harmonic (right).
With the display referenced and scaled as shown, the
readout ".0100X" designates the fractional harmonic
content. Percent is calculated as 100 x (.OlOO) = 1 .O%.
With a linear amplitude scale and a reference level
calibrated in voltage, the fractional amplitude readout
is the simple linear ratio of the two markers.
Example
To measure % AM modulation from a spectra1 display, calibrate the display with the reference level in voltage and
the amplitude scale in voltage.
Place the single marker on the carrier peak, [--J
, and the second marker on one of the side-
band peaks, m 0 The fractional amplitude
readout gives one half the modulation index .283.
%AM = 100x2x .28 = 56%.
Measurement and Readout Range
The m function formats the amplitude readout according to reference level units and scale.
Reference
Level Units
Voltage
SCALE
Logarithmic
Amplitude in dB
Amplitude ratio
20
10
AMPLITUDE READOUT FORMAT FOR MARKER a
DIFFERENTIAL MARKERS-A
SCALE
Linear
Amplitude in dB
Ratio of marker amplitudes
Manual Operation 47
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