User manual

AFG-200 SERIES USER MANUAL
Description
Sets or queries the peak frequency deviation of the
modulating waveform from the carrier waveform.
The default peak deviation is 100Hz.
The frequency deviation of external sources is
controlled using the ±5V MOD INPUT terminal on
the rear panel. A positive signal (>0~+5V) will
increase the deviation (up to the set frequency
deviation), whilst a negative voltage will reduce
the deviation.
Note
The relationship of peak deviation to modulating
frequency and carrier frequency is shown below.
Peak deviation = modulating frequency – carrier
frequency.
The carrier frequency must be greater than or
equal to the peak deviation frequency. The sum of
the deviation and carrier frequency must not
exceed the maximum frequency for a specific
carrier shape. If an out of range deviation is set for
any of the above conditions, the deviation will be
automatically adjusted to the maximum value
allowed and an “out of range” error will be
generated.
For square wave carrier waveforms, the deviation
may cause the duty cycle frequency boundary to
be exceeded. In these conditions the duty cycle will
be adjusted to the maximum allowed and a
“settings conflict” error will be generated.
Syntax SOURce[1|2]:FM:DEViation {<peak deviation in
Hz>|MINimum|MAXimum}
Parameter <peak deviation in Hz> DC~25MHz
DC~15MHz(square)
DC~1MHz (Ramp)
Example SOUR1:FM:DEV MAX
Sets the frequency deviation to the maximum
value allowed.
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