
Digital sampling oscilloscopes
To briefly recapitulate. The screen display is built up of discrete
dots whose vertical positions correspond to the signal voltage at
the time of sampling and whose horizontal positions correspond
to the total time delay between the beginning of the waveshape
and the moment when the sample was taken. To recognize the
beginning of the waveshape, the instrument uses trigger circuitry
much like that of a conventional real time oscilloscope. For
triggering from very high frequency signals, e.g. from several GHz
upwards, the trigger circuitry may be aided by a preceding ...