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Features and Functions 2
U2761A User’s Guide 59
Modulating Waveform Frequency
The range of the modulating waveform frequency is 2 mHz
to 20 kHz. The default modulating waveform frequency is
100 Hz.
Soft Front Panel Operation
On the Mod Frequency panel as shown in Figure 2-18, input
the desired modulating frequency value and select the unit
from the drop down list.
Remote Interface Operation
FM:INTernal:FREQuency <frequency>
Frequency Deviation
The frequency deviation setting represents the peak variation
in frequency of the modulated waveform from the carrier
frequency.
The range of the frequency deviation is 1 Hz to 500 kHz
(limited to 100 kHz minus 1 μHz for Ramp and Arbitrary
waveforms). The default frequency deviation is 100 Hz.
The carrier frequency must always be greater than or equal
to the frequency deviation plus 1 μHz. If you attempt to set
the deviation to a value plus 1 μHz greater than the carrier
frequency (with FM enabled), the U2761A will automatically
adjusts the deviation to the maximum value allowed with the
present carrier frequency.
The sum of the carrier frequency and deviation must be less
than or equal to the maximum frequency for the selected
function (20 MHz for Sine and Square, and 200 kHz for
Ramp and Arbitrary waveforms). If you attempt to set the
deviation to a value that is not valid, the U2761A will
automatically adjusts it to the maximum value allowed with
the present carrier frequency.