JUNCTEK JDS8000 Series, User Manual, Page: 27 / 62

JUNCTEK
JDS8000 Series User’s Manual 21
Press
【
MOD
】
→press
【
Type
】
→select FM by adjusting the knob or
pressing direction keys.

Select signal source
The JDS8000 series products can accept modulation wave forms from internal
or external modulation sources.
Press
【
Source
】
to select "Internal" or "External" modulation source.

Internal
After selecting the internal modulation source, press the
【
Shape
】
soft
key to select sine waveform, square waveform, triangle waveform,
ramp-up, ramp-down and arbitrary waveform as the modulation source.
Default is sine waveform.

External
When the external modulation source is selected, the signal generator
receives the external modulation signal input from the MOD connector on
the front panel.
The frequency range of the external signal is 20Hz~20kHz, and the
amplitude range is -5V~+5V.

Set modulation wave frequency and carrier frequency
Press the soft key
【
Mod.F
】
, when the frequency is on, you can set the
frequency of the modulating waveform, press the soft key
【
Carr.F
】
again, the
carrier frequency is on, you can set the frequency of the carrier wave. (The
modulating waveform frequency can only be used after using the "internal"
modulation source)
Use the
【
InBox
】
button to input the desired frequency value in the input box.
The modulation frequency range is 0.001Hz to 1MHz, and the default is
500Hz.

Set frequency deviation
Frequency deviation refers to the deviation of the frequency of the modulating
waveform relative to the carrier frequency. Press
【
F.Dev
】
soft key to set FM
frequency offset.
(3) PM
The modulation method in which the deviation of the phase of the carrier from
its reference phase is proportional to the instantaneous value of the
modulating signal is called phase modulation or called PM.

Choose the carrier waveform
Refer to "
Selecting carrier waveform
" in "
amplitude modulation
".
DC in pulse waveform, noise waveform and arbitrary waveform cannot be
used as carrier.