PeakTech 4105 Bedienungsanleitung Seite 104

5.6.1 Set Carrier
Firstly, set the frequency, amplitude and offset of Carrier Waveform. The waveform generator only
allows PWM to be selected for a pulse waveform.
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.
5.6.3 Modulating Waveform Frequency
Press 〖PWM Freq〗 softkey then set the desired value using knob or keypad. Generally speaking, the
modulating frequency is always lower than carrier frequency.
5.6.4 Modulating Waveform Shape
Press 〖Shape〗 softkey then select 'Shape' to enter the desired wave. Press 【Waveform】 key, then
select one of most waveforms from above table as modulating waveform, but some waveforms are
not available. Finally, return to PWM 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 frequency deviation is controlled by
the ±5 V signal level present on the rear-panel Modulation In connector.
103