NF WF1973, Инструкция по эксплуатации

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76
4. BASIC OPERATION
MULTIFUNCTION GENERATOR
4.7.5 Setting FSK
This is binary frequency shift modulation by which the output frequency switches between
the carrier frequency and hop frequency according to the modulation signal.
For the manipulation methods that are common with the modulation setting screen, refer to
pp. 70 and 72.
a) FSK example
The frequency changes suddenly, but the phase continuity of the output signal is
maintained.
b) Selecting FSK
When [Mode] (oscillation mode) is set to
[Modulation] (modulation), set [Type]
(modulation type) on the 2nd page of the
setting screen to [FSK] (FSK).
c) Waveforms for which FSK is not possible
FSK is not possible for noise, pulse wave, and DC.
d) Setting items required for FSK
Set [Freq] (carrier frequency) on the 1st page of the setting screen.
Set [HopFreq] (hop frequency) on the 2nd page of the setting screen.
The output frequency alternates between the carrier frequency and the hop frequency.
If [Source] (modulation source) is [Int] (internal), set [ModFreq] (modulation frequency).
If [Source] (modulation source) is [Ext] (external), set the trigger polarity and input the
modulation signal (TTL level) to the external trigger input terminal. If the polarity is set to
[High] (positive), the carrier frequency is output during low-level input, and the hop
frequency is output during high-level input, and vice versa if the polarity is set to [Low].
Modulation sync signal
(during internal modulation)
Hop
frequency
Hop
frequency
Carrier
frequency
Modulation signal
(during external modulation,
positive polarity)
Output signal
Select [FSK] in
[Type] and then
press the ENTER
key