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Because of this relative amplitude scaling, it is possible to create
waveforms that contain unintentional dc offsets. Consider a square wave
that ranges from +1 to -0.5. If this waveform is sent to the function
generator with a specified output voltage of 1 V peak-to-peak, the square
wave will not be centered around 0 V but will have an apparent +0.5 Volt
dc offset. The +1 relative amplitude will be scaled to +0.75 V and the -0.5
relative amplitude will be scaled to -0.25 V.
Where possible, your waveforms should range from +1 to -1 in the
waveform edit window. HP BenchLink/Arb contains a special function to
allow you expand the Y values to the maximum.
The Y values of the starting and ending points in your waveform can also
cause unexpected discontinuities if they are not the same value. The
function generator output will ‘jump’ from the ending value to the
starting value each cycle. For a smooth waveform output, be sure the
starting and ending values are the same.
Small discontinuities within the waveform can be removed by smoothing
the waveform. These discontinuities are common with waveforms created
by freehand or line drawing modes. HP BenchLink/Arb provides a special
smoothing function for this purpose.
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Chapter 3 Using HP BenchLink/Arb
About Arbitrary Waveforms
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