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HOW TO USE THE INSTRUMENT 4 - 61
DIGITAL DISPLAY INTERPOLATION
Interpolation is a mathematical way to calculate displayed dots between actually
captured signal samples. Interpolated displays help in the recognition of trace
waveforms, even when the number of samples is too low to render an accurate
representation of the signal.
Use the bottom key in the DISPLAY menu to control whether or not interpolation
is used. You can choose between dots, linear, and sine interpolation.
The default is linear interpolation. Linear interpolation fills the spaces between
each sample on the screen with additional dots that are interpolated linearly. This
is used to obtain a smoothed display.
- Use the MAGNIFY keys to set the horizontal magnify to
*
4.
- Turn the X POS control clockwise to display the adc noise only.
The noise is displayed as continuous trace. This is because the space between
the samples is interpolated with additional dots and this filled with a continuous
line.
- Press the bottom softkey to select ’dots’.
Observe that only the sample dots are displayed and the space between the dots
is blanked.
- Press the bottom softkey to select ’sine’.
Observe that the trace is smoothed again, but because of a different calculation,
it is ’roundedoff’ as compared to the linear interpolation.
Sine interpolation is recommended for signals primarily containing sine waves or
combinations.
ST6736
LINEAR DOTS SINE