| 摘要 |
<p>The time base control circuit for a waveform sampling system, is of the type which samples an input waveform, converts the waveform sample into representative digital data and stores that digital data in an addressable memory, the timing of waveform sampling being controlled by a sampling control system. A sampling bridge (10) of the digitizer samples the input signal (Vin) when it is strobed with short pulses produced by a strobe generator (52) in response to a square wave output signal from a triggered programmable-skew oscillator (54) the frequency of which is controlled by the microprocessor (46). The output of the oscillator (54) is triggered by the trigger generator (55) which detects a triggering event, such as a zero crossing in the input (Vin). The time base circuit permits the sampling system to operate in an equivalent time mode in repetitive waveform sections are sampled at progressively skewed sampling intervals.</p> |
