Agilent Technologies N4906B Serial BERT User Manual page 159

Accumulated Measurements
Agilent N4906B Serial BERT, User's Guide, October 2005
• Errored Centiseconds
The number of centiseconds in which errors were measured is
displayed here.
• Errored Milliseconds
The number of milliseconds in which errors were measured is
displayed here.
• Sync Loss Seconds
The number of seconds in which the error ratio was greater than
the sync threshold is displayed here.
Accumulation Parameters
• Elapsed Time
The time elapsed during the accumulation period is displayed here.
• Percent Complete
For single and repeat accumulation modes, the percentage of the
accumulation period completed is displayed here to one decimal
place. For repeat mode, this percentage is recalculated each time
the accumulation period repeats.
• Accumulation Mode
The type of accumulation mode is displayed here. The mode can be
Manual, Single, or Repeat.
• Accumulation Period
For single and repeat accumulation modes, the accumulation period
is displayed here. The period will be displayed in elapsed seconds,
error count, or bit count, depending on the selected method.
Burst Results
The recommended application for burst mode is to measure multiple
data bursts in quick succession. In this way, you can accumulate data
for all bursts together. You may wish to accumulate the number of bits
necessary for a statistically valid BER measurement. Refer to
"Introduction to Burst Sync Mode" on page 117 and "Test Times and
Confidence Levels" on page 11 for details.
When the accumulation period lasts for the duration of all bursts, the
gaps in error counting (while the Gate In signal was high) will not be
included in BER calculations. The gaps in error counting will not be
considered error-free periods.
Evaluating Results
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