Datasheet

5.5.3 Modulating Waveform Frequency

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

modulating frequency should be far lower than carrier frequency.

5.5.4 Modulating Waveform Shape

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

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

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

5.5.5 Modulating Source

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

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 phase deviation is same as

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

<Mod In> connector.

5.6 Pulse Width Modulation (PWM)

In PWM, carrier phase varies with the instantaneous voltage of modulating waveform.

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

displays as Mod. Then press〖Type〗and select PM mode, displaying the PWM sketch

and PWM menu.

5.6.1 Set Carrier

Firstly, set the frequency, amplitude and offset of Carrier Waveform. In PMW mode, the

generator will set carrier as pulse automatically and the pulse width of carrier changes

along with transient voltage and only allows the pulse for carrier.

5.6.2 Pulse Width Deviation

The PWM deviation setting represents the peak variation in width of the modulated pulse

waveform. Press 〖Width Dev〗softkey then enter the desired value using the knob or

keypad. If at positive peak value, the pulse width of output signal equals to setting value

of pulse width plus deviation. If at negative peak value, the pulse width of output signal

equals to setting value of pulse width decrease a deviation.