JUNCTEK
JDS8000 Series User’s Manual
Internal
During internal modulation, if the polarity is set to "positive polarity", when
the amplitude of the modulating wave is logic low level, the carrier phase
is output; when the amplitude of the modulating waveform is logic high
level, the modulation phase is output. 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 carrier phase is output;
when the external input signal is logic high level, the modulation phase is
output. 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
Press the soft key
【
Rate
】
, when the frequency is on, you can set the rate of
the modulating waveform, press the soft key
【
Carr.F
】
again, the carrier
frequency is on, you can set the carrier frequency. (The modulation rate is only
available after using the "internal" modulation source)
Use the
【
InBox
】
button to input the desired frequency value in the input box.
The frequency range is 0.001Hz to 1MHz, the default is 500Hz.
Set PSK phase
Press the soft key
【
Phase
】
to set the PSK phase.
Use the
【
InBox
】
button to input the desired phase in the input box.
The PSK phase range is 0° to 359.99°.
(7) Pulse function
The digital adjustment of the pulse width and pulse cycle time of the pulse
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