Keysight Technologies N9340B, User Manual

Page: 79 / 172

Making Measurements
Analysis the Demodulated Signals
73
Analysis the Demodulated Signals
The N9340B provides the optional AM/FM (Option AMA)
and ASK/FSK (Option-DMA) demodulation analysis
function for analysis the demodulated signals. These
functions can be activated by license key.
AM/FM Demodulation Analysis
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.
The user can save 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 Demodulation Analysis
Please refer to the procedures below for the AM
demodulation 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], Rotating the knob to highlight
Demod-
ulation Analysis , [ENTER], {AM}.
3 Press {Carries Freq} > [100] > {MHz} to set the carrier
frequency.
4 Set the attenuation state to Auto (default):
Press {More 1 of 3} > {More 2 of 3} > {Attenuation
Auto} > {More 3 of 3}