User Manual

Modulation Function 41
9.1.1 To Select Modulation Source
The 4060B Series can accept modulating signal from an internal or external modulation source. Press Mod → AM →
Source to select “Internal” or “External” modulation source. The default is “Internal”.
9.1.2 Internal Source
When internal AM modulation source is selected, press Shape to select Sine, Square, Triangle, UpRamp, DnRamp, Noise
or Arb as modulating waveform.
• Square: 50% duty cycle
• Triangle: 50% symmetry
• UpRamp: 100% symmetry
• DnRamp: 0% symmetry
• Arb: the arbitrary waveform selected of the current channel
Note: Noise can be used as modulating waveform but cannot be used as the carrier.
9.1.3 External Source
When external AM modulation source is selected, the generator accepts external modulating signal from the [Aux In/Out]
connector at the rear panel. At this time, the amplitude of the modulated waveform is controlled by the signal level
applied to the connector. For example, if the modulation depth is set to 100%, the output amplitude will be the maximum
when the modulating signal is +6V and the minimum when the modulating signal is -6V.
The 4060B Series can use one channel as a modulating source for the other channel. The following example takes the
output signal of CH2 as the modulating waveform.
1. Connect the CH2 output terminal to [Aux In/Out] connector on the rear panel using a dual BNC cable.
2. Select CH1 and press Mod to select the desired modulation type as well as set the corresponding parameters, and
then select external modulation source.
3. Select CH2 and select the desired modulating waveform and set the corresponding parameters.
4. Press Output to enable the output of CH1.
9.1.4 Modulation Depth
Modulation depth expressed as a percentage indicates the amplitude variation degree. AM modulation depth varies from
1% to 120%. Press AM Depth to set the parameter.
• In the 0% modulation, the output amplitude is the half of the carrier’s amplitude.
• In the 120 modulation, the output amplitude is the same with the carrier’s amplitude.
• For an external source, the depth of AM is controlled by the voltage level on the connector connected to the [Aux
In/Out]. ±6V correspond to 100% depth.
• When external modulation source is selected, this menu is hidden.
9.1.5 Modulation Frequency
When internal modulation source is selected, press AM Freq to highlight the parameter, then use the numeric keyboard
or arrow keys and knob to input the desired value.