A&D Series 57ZZ Manual do Utilizador descarregar pdf (Página 12)

structing straight-edged signals such as square

waves.

The more versatile sin x/x interpolation connects

sample points with curves (see Figure 11). Sin x/x

interpolation is a mathematical process in which

points are calculated to fill in the time between the

real samples.

This form of interpolation lends itself to curved and

irregular signal shapes, which are far more common

in the real world than pure square waves and pulses.

Consequently, sin x /x interpolation is the preferred

method for most applications.

Some digitizing oscilloscopes can use equivalent-

time sampling to capture very fast repeating signals.

Equivalent-time sampling constructs a picture of a

repetitive signal by capturing a little bit of informa-

tion from each repetition (see Figure 12). The wave-

form slowly builds up like a string of lights going on

one-by-one. With sequential sampling, the points

appear from left to right in sequence; with random

sampling, the points appear randomly along the

waveform.

Figure 12. Equivalent-time sampling.

Figure 11. Linear and sine interpolation.

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