Keysight M8000 Series of BER Test Solutions User Guide 485
Working with Measurements 8
• Fast Total Jitter at BER
This enables the Fast Total Jitter measurement. Before enabling this
measurement, you need to know the BER floor of the device and to
specify a BER threshold that is above that floor.
Evaluation Parameters
You can use the Properties window to specify the following evaluation
parameters:
• Analyze Errors
You can analyze for:
• All Errors
To calculate the BER values from all bits/errors.
• Errored Zeros
To calculate the BER values if "0" is expected, but "1" received.
• Errored Ones
To calculate the BER values if "1" is expected, but "0" received.
• BER Threshold
To calculate the parameters for the given BER threshold. This is the
BER level for which output timing numerical values (phase margin,
skew, etc.) are calculated. It is also the upper limit of the BER range for
RJ/DJ separation.
The BER threshold influences some of the parameters of the DUT
Output Timing measurement. You can also drag and drop the
horizontal BER threshold in the graphical display to change this value.
• Min BER for RJ/DJ Separation
Lower limit of the BER range for RJ/DJ separation.
• Residual BER for Estimated Total Jitter
BER level for which the estimated total jitter is calculated.
• Display Unit
Choose between Unit Interval and Seconds to select the timebase for
the display's x-axis.
• Vertical Axis Scale
Choose between Logarithmic and Linear to select the scale for the
display’s y-axis.
For example, a DUT Output Timing measurement displayed on a linear
scale may look like this:
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