If I am using my DS4000 series scope to view a periodic pulse in Normal trigger mode, shouldn't the Persistence Time setting to "min" cause the display to clear the display after a few milliseconds?
Setup:
No Acquire or Single Sweep function used.
Normal triggering, edge, level is set to properly trigger withing the amplitude window of the expected pulse.
The Normal trigger functions correctly, every time a pulse occurs, it triggers a trace.
Trace Persistence is set to "min" (Trace Persistence can be set over a large range from "min" to "infinity" duration.)
Time/Div: 1-mSec/Div
Delayed Sweep Off
The problem is that the most recent pulse that triggered a sweep remains forever displayed, showing no regard to Trace Persistence settings.
If I am monitoring a pulse from a Human or from a device, I must know, at a glance, when the pulses have stopped occurring, and while high pulse repetition rates will display thousands of overlapping pulses, the scope fails to blank a stale display, even when no storage function is activated.
On a conventional analog oscilloscope, the persistence of a display is strictly controlled by the phosphor itself, on older storage scope, the trace is remembered and kept displayed until cleared, but on this digital scope, one doesn't know at a glance if the pulse train has ceased.
How could this be normal operation?
Would an Agilent or Tek scope behave the same?
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