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IM DLM6054-01EN
Measurement Items (Item)
You can select the following measurement items.
Mask Test
Wave Count Acquisition error count
Wave Count % Acquisition error rate (%)
Sample Point Count Sampling error count/total data count
Sample Point Count % Sampling error rate (%)
Eye Pattern Measurement For definitions of measurement items and their formulas, see “Mask Test” in
section 2.9.
Crossing % Level where the rising edge and the falling edge of the eye pattern intersect,
expressed as a percentage with respect to the difference between Vtop and
Vbase
Eye Height Height of the eye
Eye Width Width of the eye
Q Factor Quality factor of the eye diagram expressed as a ratio of the eye height with
respect to the noise at both the high and low voltage levels
Jitter Magnitude of the time fluctuation of the first crossing point (crossing1)
Jitter2 Magnitude of the time fluctuation of the second crossing point (crossing2)
Duty Cycle Distortion % Time difference between the falling edge intermediate point and the rising
edge intermediate point as determined by the intermediate threshold level
expressed as a percentage with respect to the full bit width
Vtop Average top peak voltage of the vertical histogram
Vbase Average bottom peak voltage of the vertical histogram
σ
top
Standard deviation of the top peak voltage of the vertical histogram
σ
base
Standard deviation of the bottom peak voltage of the vertical histogram
Tcrossing1 Average time of the first crossing point
Tcrossing2 Average time of the second crossing point
Vcrossing Voltage at the point where the rising edge and the falling edge cross
Ext Rate dB Extinction rate in dB
Rise Rise time between the specified lower and upper threshold levels
Fall Fall time between the specified upper and lower threshold levels
Threshold Levels (Set Threshold Levels)
You can specify the threshold levels using percentages or physical values. The threshold levels are
used to measure the eye pattern Rise (the time it takes to go from Lower to Upper) and Fall (the time it
takes to go form Upper to Lower) items.
V You can set the level to a value within ±10 divisions. The unit changes depending on the set conditions.
% You can set the level to a percentage from 0 to 100%. The difference between Vtop and Vbase is taken to
be 100%.
Dark Level (Set Vdark)
Set the dark level (zero light level). The dark level is used to measure Ext Rate dB (the eye pattern
extinction rate in dB).
You can set the level to a value within ±10 divisions. The unit changes depending on the set conditions.
Accumulation Count (Accum Count)
Set how many acquired signals to accumulate. For details on the accumulation feature, see section 8.2.
Mask Display (Mask)
You can select whether or not to display the mask images that have been created on a PC.
10.8 Performing a Mask Test
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