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Set frequency deviation
Frequency deviation is the deviation of frequency of waveform subject to FM from the carrier frequency. The range of FM
frequency deviation i
s 1μHz to half of the maximum carrier frequency, 1kHz by default. You can change it with the
multi-functional control and direction key on the interface for using frequency modulation or by pressing Freq.
•
Frequency deviation must not be more than carrier frequency. If the frequency deviation is more than the carrier
frequency, function/ arbitrary waveform generator will automatically limit the deviation to the allowable maximum
carrier frequency.
•
The sum of frequency deviation and carrier frequency must not be more than the allowable maximum carrier
frequency. If the frequency deviation is invalid, the function/arbitrary waveform generator will automatically limit
the deviation to the allowable maximum carrier frequency.
Comprehensive example
First make the instrument run in frequency modulation (FM) mode, and then set an internal square wave of 2kHz as
modulation signal and a sine wave with frequency of 10kHz and amplitude of 100mVpp as carrier signal. Finally set
frequency deviation to be 5kHz.
The specific steps are as follows:
1)
Use FM function
Press MOD, Type and FM in sequence (press Type to select if “Type” is not highlighted) to use FM function.
Figure 4- 17 Select FM function
2)
Set modulation signal parameters
Set with the multi-functional control and direction key after using FM function. You can also press the corresponding soft
keys on the above interface for using the FM function, when the interface will display:
