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Frequency Deviation (FM)
The frequency deviation setting represents the peak variation in frequency of the modulated waveform from the
carrier frequency.
When the carrier is PRBS, frequency deviation causes a change in the bit rate equal to one-half of the set frequency.
For example, a 10 kHz deviation is equivalent to a 5 KBPS change in bit rate.
– Frequency deviation: 1 μHz to (carrier frequency) / 2, default 100 Hz.
– For FM, the carrier frequency must always be greater than or equal to the frequency deviation. Attempting to set a
deviation greater than the carrier frequency will cause the instrument to set the deviation equal to the carrier
frequency.
– The carrier frequency plus the deviation cannot exceed the selected function's maximum frequency plus 100 kHz.
If you attempt to set the deviation to an invalid value, the instrument adjusts it to the maximum value allowed with
the present carrier frequency. The remote interface also generates a "Data out of range" error.
Front Panel Operations
Press [Modulate] > Type
AM
> Type
FM
> Freq Dev. Use the numeric keypad or the knob and arrows to set a desired
value. If you use the keypad, select a prefix unit to finish.
SCPI Command
[SOURce[1|2]:]FM[:DEViation] {<peak_deviation_in_Hz>|MINimum|MAXimum|DEFault}
Modulating Source
On a two-channel instrument you can modulate one channel with the other.
– Modulating source: Internal (default) or Channel#.
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Keysight EDU33210 Series User's Guide
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