JUNCTEK
JDS8000 Series User’s Manual
22
Select PM
Press
【
MOD
】
→press
【
Type
】
→select phase modulation by adjusting the
knob or pressing direction keys.
Select signal source
The JDS8000 series 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 wave.
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 waveform 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 waveform.
(The modulating wave 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 the modulation waveform phase deviation
Phase deviation refers to the change in the phase of the modulating waveform
relative to the carrier phase. Press the soft key
【
P.Dev
】
to set the phase
deviation of phase modulation.
Use the
【
InBox
】
button to input the desired deviation value in the input box.
The phase deviation can be set from 0° to 359.99°, with a default value of
180°.
(4) ASK
The modulation method in which the amplitude variation of the carrier is
controlled by the baseband digital signal is called Amplitude Shift Keying (ASK),
also known as digital amplitude modulation.
Select the carrier waveform
Содержание JDS8000 Series
Страница 1: ......
