1S1: Difference between revisions

The 661 also has this capability, in its "A vert/B horiz" mode, which is like X-Y mode for a sampler.  In this mode, the horizontal-in voltage controls to the time after the trigger event when the sample should be taken, and the vertical-out voltage corresponds to the voltage measured at that instant.  This allows a waveform to be digitized using an arbitrarily slow DAC to generate the horizontal voltage and ADC to read the sampled output.  But perhaps more importantly, by setting a constant horizontal-in voltage, it allows the output signal at one equivalent time instant to be processed in the time domain.  For example, this allows the voltage to be low-pass filtered, so that it can be more accurately measured.  The other reason why one might want a signal the consists of multiple sequential measurements of the same equivalent-time instant is that statistics can be calculated on these observations.  For example, one might want to know, when testing a logic gate, what is the propagation delay such that 99.9% of the transitions happen faster than this.  The horizontal-in voltage can also be produced, in "manual" mode, by setting a knob on the 1S1.