78
Arb
PM Freq
Set the modulating waveform frequency. Frequency
range: 1mHz-1MHz.
To Select the Modulation Source
The T3AFG can accept a modulating signal from an internal or external
modulation source. Press Mod → PM → Source to select “Internal” or “External”
modulation source. The default is “Internal”.
1. Internal Source
The way of selecting the internal source is similar to AM.
2. External Source
When external PM modulation source is selected, the generator accepts an
external modulating signal from the [Aux In/Out] connector at the rear panel.
At this time, the phase of the modulated waveform is controlled by the signal
level applied to the connector. For example, if the phase deviation is set to
180°, the output phase will increase 180° when the modulating signal is +6 V
and decrease 180° when the modulating signal is -6 V.
To Set Phase Deviation
Press Phase Dev to highlight the parameter, and then use the numeric
keyboard or arrow keys and knob to input the desired value.
•
Use the numeric keyboard or arrow keys and knob to input the desired
value.
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The range of phase deviation is from 0° to 360° and the default value is
100°.
Note:
The methods of setting other parameters of PM are similar to AM.