Persistence Display; Apply Persistence - Teledyne HDO9000 Operator's Manual

HDO9000 High Definition Oscilloscopes Operator's Manual

Persistence Display

The Persistence feature retains waveform traces on the display for a set amount of time before
allowing them to gradually "decay," similar to the display of old phosphor screen oscilloscopes.
The Persistence display is generated by repeated sampling of the amplitudes of events over time,
and the accumulation of the sampled data into display maps. These maps create an analog-style
display. Statistical integrity is preserved because the duration (decay) is proportional to the
persistence population for each amplitude or time combination in the data.
Use Persistence to accumulate on-screen points from many acquisitions to see your signal change
over time. The persistence modes show the most frequent signal path in three-dimensional
intensities of the same color (Analog), or graded in a spectrum of colors (Color). You can show
persistence for any channel, math function, or memory.
Access the Persistence dialog from the Display dialog or by choosing Display > Persistence Setup.

Apply Persistence

1. Check Persistence On.
2. To set up all traces together, touch All Locked. This constrains all input channels to the same
persistence settings.
To set up traces individually, touch Per Trace.
3. Use the buttons to select a persistence mode:
between these extremes. The information in the lower populations (for example, down at the
noise level) could be of greater interest to you than the rest. The Analog persistence view
highlights the distribution of data so that you can examine it in detail.
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Color Mode persistence works on the same principle as Analog
persistence, but instead uses the entire color spectrum to map signal
intensity: violet for minimum population, red for maximum population.
In this mode, all traces use all colors, which is helpful for comparing
amplitudes by seeking like colors among the traces.
In Analog Mode, as a persistence data map develops, different
intensities of the same color are assigned to the range between a
minimum and a maximum population. The maximum population
automatically gets the highest intensity, the minimum population gets
the lowest intensity, and intermediate populations get intensities in