RIGOL Measurement Examples
3-6 User’s Guide for DSA1000 Series
3.3 Measuring an AM Signal
Through the demodulation function, the AM modulating signal can be separated from
the carrier and displayed on the screen. In the example below, we use a generator
(such as RIGOL DG3101A) to output an AM modulating signal as the signal under
measure: the carrier is a sine wave with 100 MHz and -10 dBm, the modulating
frequency is 1 kHz, while the modulation depth is 100%.
Method 1: (in Zero Span)
Procedures:
1. Device attachment
Connect the output terminal of the generator to the RF INPUT 50Ω terminal on
the front panel of the analyzer.
2. Measuring in zero span
(1) Reset the analyzer
－Press Preset
(2) Set the parameters
－Press FREQ
－Press Center Freq and enter 100 MHz.
－Press SPAN
－Press Zero Span and set the span of frequency as 0 Hz.
－Press Sweep
－Press Time and enter 10 ms in Manual mode.
(3) Use the marker to measure
－Press Single
－Press Peak
－Press Marker
－Press Delta
－Page down
－Press Readout and enter the lower menu.
－Press 1/Δtime
－Press R-Peak or L-Peak
Also, you can press Peak Peak Right or Peak Left to view the peaks at
both sides.
－Read the frequency of the marker, that is the frequency of the modulating
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