Datasheet

5.6.3 Modulating Waveform Frequency

Press 〖PWM Freq〗softkey then set the desired value using knob or keypad. Usually the

modulating frequency should be far less than carrier frequency.

5.6.4 Modulating Waveform Shape

Press 〖Shape〗softkey then select ‘Shape’ to enter the desired wave. Press Waveform

Menu key, then select one of most waveforms from above table as modulating waveform,

but some waveforms are not available. Finally, return to modulating menu.

5.6.5 Modulating Source

The waveform generator will accept an internal or external modulation source for PWM.

Press 〖Source Int/Ext〗softkey. It’s available to set modulating frequency and modulating

waveform if ‘Internal’ source is selected. But if you select External source, the carrier

waveform is modulated with an external waveform. The pulse width deviation is same as

actual value if amplitude 5Vpp, dc offset 0Vdc signal level present on the rear-panel

<Mod In> connector.

5.7 Sum Modulation

In Sum Modulation, the instantaneous voltage of output waveform is the sum voltage of

carrier and modulating waveform.

Press 【Modulate】key to enter into the Modulating output mode, the working mode

displays as Mod. Then press〖Type〗and select SUM mode, displaying the sum

modulating sketch and SUM menu.

5.7.1 Set Carrier

Firstly, set the shape, frequency, amplitude and offset of Carrier Waveform. In Sum, the

instantaneous voltage of output waveforms equals to sum voltage of carrier waveform

and modulating waveform. You can select one of most waveforms from above table to be

carrier, but some waveforms are not available.

5.7.2 Sum Amplitude

Press 〖Sum Ampl〗 and select Sum Ampl parameter to set the sum amplitude value.

The sum amplitude represents the amplitude of the signal added to the carrier (in percent

of carrier amplitude). When sum amplitude at 100%, amplitude of modulating waveform

is a half of amplitude of carrier waveform. When sum amplitude at 0%, amplitude of

modulating waveform is 0, then amplitude if carrier waveform will be half of setting value

for carrier waveform.