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phase difference is. For example, the resolution of the phase difference is 28.8°when
the frequency is 1MHz.
Linking the signals of two channels to the oscilloscope, setting the harmonic
times and phase difference of the signals of two channels, various stable Lissajous
figures can be obtained.
3.4 Frequency sweeping
Press the keys of【Sweep】 to light the indicate light of “Sweep” and select the
function of “Frequency sweeping”, “Frequency sweeping” will be displayed on the
top left of the screen and the frequency sweeping signal can be output from the end
of“Output A”. The sweeping of output frequency adopts step mode. The output
frequency will be added or subtracted automatically by a step every other interval
time. The start frequency, the end frequency, the step frequency and the interval time
are settled by operator.
3.4.1 Setting of start point and end point： The start point of the frequency
sweeping is the start frequency and the end point of the frequency sweeping is the
end frequency. Press the key of 【Menu】 and select “ Start frequency”，the start
frequency value will be displayed. The setting of start frequency can be carried by
the numeric keys or knob. Press the key of 【Menu】 and select “ End frequency”，
the end frequency value will be displayed. The setting of end frequency can be
carried by the numeric keys or adjusting of knob. It must be paid attention that the
end frequency should be greater than start frequency. Otherwise, the sweeping cannot
be carried.
3.4.2 Setting of frequency step： Since the start frequency and end frequency have
been set, the frequency step will be decided according to the measuring degree. The
larger the frequency step, the less the points of frequency in one sweeping process,
the rougher the measuring, but the required time is shorter. The smaller the frequency
step, the more the points of frequency in one sweeping process, the finer the
measuring, but the required time is longer. Pressing the key of 【 Menu 】 and
selecting “Step frequency”，the frequency step value will be changed to green. The
setting of frequency step can be carried by the numeric keys or adjusting of knob.
3.4.3 Selection of sweeping mode： There are three frequency sweeping modes,
expressed in 0, 1, and 2.
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