Histogram
The histogram shows measurement data as a graphical representation of the distribution of measurement
data. Data is grouped in bins represented by vertical bars in the histogram display.
Autoranging can adversely affect the histogram display when measuring repetitive signals
spanning multiple ranges. To avoid this, select a fixed range when using the histogram display.
Selecting the Display
Pressing the key, followed by the Display softkey allows you to select the display type:
Binning
The Binning softkey allows you to either let the instrument control how the histogram is binned (auto-
matic binning), or to manually specify the binning parameters with the Bin Settings softkey. Changing
any binning parameter, or switching between automatic and manual binning, will automatically start the
histogram over with new data. On the 34461A/65A/70A, this also resets the trend chart.
For Binning Auto, the algorithm starts by continuously readjusting the histogram span based on the read-
ings 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. If the NPLC setting is < 1 PLC, or Aperture Time (34465A/70A only) is <
20 ms, the maximum number of bins is 100.
Keysight Truevolt Series Operating and Service Guide
133
Features and Functions
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