User Manual

5.5 Phase Modulation (PM)

A modulated waveform consists of a carrier waveform and a modulating waveform. PM is very similar

to FM, but in PM the phase of the modulated waveform is varied by the instantaneous voltage of the

modulating waveform.

5.5.1 Set Carrier

Firstly, set the shape, frequency, amplitude and offset of Carrier Waveform. You can select most

waveforms from above to be carrier, but some waveforms are not available.

5.5.2 Phase Deviation

Press 〖Phase Dev〗softkey then enter the desired value using knob or keypad. The phase deviation

setting represents the peak variation in phase of the modulated waveform from the carrier waveform.

If at positive peak value, the phase of output signal increases one phase deviation. If at negative

peak value, the phase of the output signal will decrease one phase deviation.

5.5.3 Modulating Waveform Frequency

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

modulating frequency is always lower than carrier frequency.

5.5.4 Modulating Waveform Shape

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

select most waveforms from above table as modulating waveform, but some waveforms are not

available. Finally, return to PM menu.