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3.2.11 Setting of duty cycle of channel A： Press the key of 【 Duty】 and the
channel selects square automatically. The duty cycle is displayed. The value can be
entered by the numeric keys or by the knob. The square with set duty cycle will be
output. The adjusting range of duty cycle is 1％～99％.
3.3 Frequency of channel B
Press the key of 【CHB】 to select the function of“Frequency of channel B”. The
sequence number and name of waveform of channel B will be displayed on the top
left of the screen.
The setting method of frequency, period, amplitude, Vpp, Vrms, waveform, duty
cycle of channel B is the same as those of channel A. the difference is that no
amplitude attenuation and no DC offset for channel B.
3.3.1 Setting of harmonic wave of channel B：The frequency of channel B can be
set and displayed at the multiple of the frequency of channel A. That is to say, the
signal of channel B is the N-grade harmonic wave of the signal of channel A. Press
the key of【 harmo】 and selected “Harmonic wave of channel B”. The grade of
harmonic wave can be entered by the numeric keys or by the knob. The phases of the
two channels can get the stable synchronously.
If “Harmonic wave of channel B” is not selected, the signals of two channels
will not keep harmonic relation at all. Even the frequency of channel B is set to be
the multiple of that of channel A, the signals between the two channels cannot
always reach the phase synchronization. So to keep the harmonic relation between
the signals of two channels, set the frequency of channel A; select “Harmonic wave
of channel A” and set harmonic grade. The frequency of channel B can be changed
automatically. Do not use the frequency of channel B.
3.3.2 Setting of phase shift of channel B If the harmonic wave of channel B has
been set, press the key of【Phase】 and select “Phase shift of channel B”. Now the
signals of two channels are completely synchronous with the phase difference of 0.
The phase difference of the signals of two channels can be entered by the numeric
keys or by the knob. The maximum resolution of time difference of the signals of two
channels is 80ns, so the resolution of phase difference is higher when the frequency
is lower. For example, the resolution of the phase difference is 1°when the frequency
is lower than 34KHz. The higher the frequency is, the lower the resolution of the
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