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APPENDIX P P - 3
EXPANSION AND INTERPOLATION
Sometimes there is a need to look at a single shot or low repetition rate signal at
high timebase speed. This can be done by selecting the ‘real time sampling only’
mode in the Main Time Base menu. In this mode the scope never switches to
random sampling.
In order to capture a longer time ‘window’ than would be accessible with the given
time base speed, the Main Time Base mode menu allows you to select a longer
acquisition length.
By means of horizontal magnification (2x, 4x, 8x, up to 32x) you can expand the
signal, giving you a higher effective time base speed. In the DOTS mode, single
samples become visible, and SINE and LINEAR interpolation can be used to
reconstruct a true-to-life waveform. In four channel single shot mode with its
maximum sample rate of 5 MS/s, a timebase speed close to 1 µs/div is no
problem. The 8x magnified waveform is then reconstructed out of 62 samples.