484 Keysight M8000 Series of BER Test Solutions User Guide
8 Working with Measurements
Measurement Duration
The duration of a Fast Total Jitter measurement depends on:
•the BER threshold
• the bit rate
• the sample delay step size
• the contribution of random jitter
• the contribution of deterministic jitter
Compared to a conservative bathtub measurement, the Fast Total Jitter
measurement can reduce the measurement time by more than a factor of
40.
Typical test times are approximately 20 minutes at 10 Gbit/s and slightly
more than one hour at 2.5 Gbit/s for a measurement at the 10
-12
BER
threshold with an overall confidence level better than 90%.
Acquisition Parameters
You can use the Properties window to specify the following acquisition
parameters:
Set the criteria for moving to the next sample point:
• Number of Compared Bits
After this number of compared bits, the measurement stops for the
current sample point and moves to the next one.
• Number of Errors
After this number of errors, the measurement stops for the current
sample point and moves to the next one. This allows you to speed up
the measurement. You can switch off this option if only the number of
compared bits is important.
Set the criteria for the sample delay:
• Sample Delay Resolution
Specifies the time distance between sampling points. A smaller value
yields more sampling points in a unit interval. You can enter the
resolution in UI.
If the resolution used for the measurement is not high enough, the
bathtub curve does not clearly show the edges. For example, you may
wish to change the Resolution from 0.01 to 0.005 and run the
measurement again.
• Sample Delay Optimization
You can choose between Fast Total Jitter at BER or None.
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