Chapter 6 How to Operate Sampling Scope
6-42
Table 6.2.4-7 Items of Jitter Measure Dialog Box - Advanced Tab
Item Description
TJ Measurement
BER
Sets the bit error rate to measure the eye opening in the Bathtub graph.
Fixed RJ Set Off to display the graph using RJ calculated from the measured
waveform.
Set On to display TJ graph by setting RJ an arbitrary value.
It is used to simulate the change of TJ by changing RJ value.
RJ Value TJ is calculated with the use of the value entered here when Fixed RJ is
set to On.
Correction Factor When setting the display to On, DJ (Scale), the correction coefficients of
RJ (Scale) and RJ (rms) can be entered. Corrected value(s) is(are)
indicated by “*1” in the measurement result display area.
DJ (Scale) It is the correction coefficient of DJ.
The value calculated from the waveform multiplied by this number is
displayed in the measurement result.
Set to 1.00 for no correction.
RJ (Scale) It is the correction coefficient of RJ.
The value calculated from the waveform multiplied by this number is
displayed in the measurement result.
Set to 1.00 for no correction.
RJ (rms) RJ (d-d), RJ (rms) correction coefficient.
RJ is corrected with the following formula.
22
rm
RJ
σ
m
: Standard deviation of measured RJ
σ
r
: Correction Coefficient
RJ: RJ (d-d), RJ (rms) after correction.
When not correcting, set Correction Factor to Off.
Define Threshold Sets the position detection method of the cross point relative to the
amplitude of the eye pattern.
Set it to Auto for automatic detection and Manual to specify the
position.
Manual Crossing When Define Threshold is Manual, set the cross point position within
the range of 30 to 70% of the amplitude.
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