HP 54522A - Page 69

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Repetitive/Real Time Softkey
Press the Stop/Single key repeatedly without pressing the Clear
display key.
By not pressing the clear display key, the waveform fills in with each
single-shot addition to the waveform. Interpolation is still turned off and 40
points are captured with each acquisition. The waveform fills in because the
data from previous acquisitions is retained on the screen and each new
acquisition is interleaved with the previous data.
When averaging is off and persistence is set to minimum If newly
acquired data points fall into time buckets that are empty, the data
points are stored in the time buckets and the display is updated. Ifa
time bucket already contains a data point, the old data is replaced by the
new data point. Data stays on screen until you modify the instrument
setup or you press the Clear display key.
When averaging is on If newly acquired data points fall into time
buckets that are empty, the data points are added to the time buckets
and added to the display. If a time bucket already contains a data point,
the new data is averaged with the old data point. Depending on how
many data points are acquired with each acquisition, it can take multiple
acquisitions to meet the number of averages selected. At 50 ns/div and
slower, enough data is acquired so that each acquisition corresponds to
one average.