For Binning Auto, the algorithm starts by continuously readjusting the histogram span based on the readings coming in, completely re-binning the data whenever a new value comes in outside of the current span. After acquiring a large number of readings, a new reading outside of the range causes the bins to be compressed by a factor of two such that the new bin range will cover the new reading. The number of bins shown is a function of the number of readings received: 0 to 100 readings = 10 bins, 101 to 500 readings = 20 bins, 501 to 1000 readings = 40 bins, 1001 to 5000 readings = 100 bins, 5001 to 10000 readings = 200 bins, >10000 readings = 400 bins. For Binning Manual, you can set number of bins to 10, 20, 40, 100, 200, or 400. You can specify the bin range as either Low and High values, or as a Span around a Center value. For example, the histogram range shown above (from -5 to 4 V) could be specified as a Low of -5 V and a High of 4 V, or a Center of - 0.5 V and a Span of 9 V.
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