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32 Agilent E1441A Application Information
Chapter 2
FM Waveform Shape The function generator will accept only an internal modulating signal. You
cannot modulate with an external source.
Modulating waveform shape (internal source): Sine, Square, Triangle,
Ramp, Noise, or Arbitrary waveform. The default is Sine.
You can use the noise function as the modulating waveform. However, you
cannot use the noise function or dc volts as the carrier waveform.
Use the following command to set the modulating waveform shape:
FM:INTernal:FUNCtion SIN|SQU|TRI|RAMP|NOIS|USER
FM Waveform Frequency The function generator will accept only an internal modulating signal. You
cannot modulate with an external source.
Modulating frequency: 10 mHz to 10 kHz. The default is 10 Hz.
The sync signal for
FM is referenced to the modulating signal (not the
carrier). A momentary
TTL “high” pulse (> 200 ns) is output at each
zero-crossing point of the modulating signal. The signal is output from the
front-panel SYNC terminal.
Use the following command to set the modulating waveform frequency:
FM:INTernal:FREQuency <frequency>|MINimum|MAXimum
FM Peak Frequency
Deviation
The peak frequency deviation represents the variation in frequency of the
modulating waveform from the carrier frequency.
Peak frequency deviation: 10 mHz to 7.5 MHz. The default is 100 Hz.
The carrier frequency must always be greater than or equal to the peak
frequency deviation. If you attempt to set the deviation to a value greater
than the carrier frequency (with
FM enabled), the function generator will
automatically adjust the deviation to equal the present carrier frequency. A
-221, “Settings conflict” error is generated and the deviation is adjusted.
The sum of the carrier frequency and peak frequency deviation must be less
than or equal to the maximum frequency for the selected function
plus 100
kHz
(15.1 MHz for sine and square, 200 kHz for triangle and ramp, and 5.1
MHz for arbitrary waveforms). If you attempt to set the deviation to a value
that is not valid, the function generator will automatically adjust the
deviation to the maximum value allowed with the present carrier frequency.
A -221, “Settings conflict” error is generated and the deviation is adjusted.
Use the following command to set the peak frequency deviation:
FM:DEViation <peak deviation in Hz>|MINimum|MAXimum