JUNCTEK
JDS8000 Series User’s Manual
Refer to "Selecting carrier waveform" in "Amplitude modulation".
DC in pulse waveform, noise waveform and arbitrary waveform cannot be
used as carrier.
Select ASK
Press
【
MOD
】
→press
【
Type
】
→select ASK by adjusting the knob or
pressing direction keys.
Set the polarity
Press the soft key
【
Polar
】
to select the amplitude output controlled by the
“positive polarity” or “negative polarity” of the modulating waveform.
Internal
During internal modulation, if the polarity is set to "positive polarity", when
the modulating wave is logic low level, the smaller amplitude between the
carrier amplitude and the modulation amplitude is output; when the
modulating wave is logic high level, the output carrier amplitude and the
larger amplitude between the modulation amplitude. When the polarity is
"Negative", the opposite is true.
External
During external modulation, if the polarity is set to "positive polarity", when
the external input signal is logic low level, the smaller amplitude between
the carrier amplitude and the modulation amplitude is output; when the
external input signal is logic high level, the output The larger amplitude
between the carrier amplitude and the modulation amplitude. When the
polarity is "Negative", the opposite is true.
Select signal source
The JDS8000 series generators can accept modulation waveforms from
internal or external modulation sources.
Press
【
Source
】
to select "Internal" or "External" modulation source.
Internal
Select the internal modulation source, that is, select a square waveform
with a duty cycle of 50% as the modulation waveform. At this point, the
frequency at which the output amplitude shifts between the carrier
amplitude and the modulation amplitude is determined by the modulation
rate.
External
When the external modulation source is selected, the signal generator
accepts the external modulation signal input from the MOD port on the
front panel.
The frequency range of the external signal is 20Hz~20kHz, and the
amplitude range is -5V~+5V.
Set modulation rate and carrier frequency
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