Telecommunications Techniques Corporation interceptor 147, Reference Manual, Page: 266 / 280

Understanding Histograms
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INTERCEPTOR 147 2 Mbit/s and Data Analyzer
1. Time and Date of Print
At the top of Histogram Print, is the time and date
when the histogram was created.
2. Histogram Title
The histogram title indicates what result is being
histogrammed. For example, depending on the
Hist Rslt selection, the histogram may show Bit
Errors versus Time, or Severely Errored Seconds
versus Time, etc.
3. Transition Bar(s) Labeled Av T, Storage, Power
Three transition bars that may appear have the
following titles:
— Av T (Available Time)
— Storage
— Power
These transition bars indicate changes (or
transitions) that occurred during the histogram
period that affect the availability of histogram
information.
The Av T transition bar is included in histograms
of one of the performance results (SES, Err Sec,
or Unavl Sec) if, sometime during the histogram
period, a transition was made away from Available
Time. The Storage transition bar is included in
the histogram if, sometime during the histogram
period, the Histogram Buffer was turned off. The
Power transition bar is included if, sometime
during the histogram period, the instrument power
was turned off.
4. Result Being Tracked (Y-Axis)
The result being reported in the histogram is
indicated along the Y axis. The test instrument
automatically presents an appropriate scale along
the Y-axis.