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Analysis the Modulated Signals
AM/FM Modulation Analysis
The N932xC spectrum analyzer provides the optional AM/FM
(Option AMA) and ASK/FSK (Option-DMA) modulation analysis
function for analysis the modulated signals. These functions can be
activated by license keys.
Optional AM/FM demodulation analysis provides modulation
metrics, including carrier power, modulation rate, AM depth/FM
deviation, SINAD and carrier frequency offset. User definable limits
provide Pass/Fail indicators of four types:
Maximum carrier power, Maximum AM modulation index or FM
deviation, Minimum AM modulation index or FM deviation, and
Minimum carrier frequency offset.
This mode allows you saving the waveforms with metrics for
reporting as well as the set-up parameters for future
measurements or analysis. In the following example, you can use
any source available (such as AM/FM radio) as long as it has
AM/FM signal generation capability.
AM Modulation Analysis
Please refer to the procedures below for the AM modulation
analysis:
1 Connect the signal generator to RF IN connector and turn on
the signal generator's AM and RF output.
2 Turn on the AM demodulation analysis function.
Press MODE > Modulation Analysis > AM.
3 Press Frequency > Carrier Freq > 100 > MHz to set the carrier
frequency.
4 Set the attenuation state to Auto (default):
Press Amplitude > Attenuation Auto
5 Press Shift > Disp > Y Scale > Scale Coupling On to set the Y scale
auto coupling.
Functions and Measurements
Analysis the Modulated Signals
87
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