Keysight M8000 Series of BER Test Solutions User Guide 479
Working with Measurements 8
Output Timing Measurement
Overview
The Output Timing measurement is used to measure the timing and jitter
behavior for a device under test (DUT). It uses a bit error rate (BER)
measurement to evaluate the shape of the eye for the output signal of the
DUT. It also analyzes the jitter, separates the random jitter and
deterministic jitter components, and estimates the total jitter.
A direct result is the determination of the optimum sampling point delay
for receiving data from the DUT with maximum confidence.
DUT Output Timing/Jitter includes the Fast Total Jitter measurement
that can be used to measure the total jitter for devices which generate a
very low error density in a reasonable time span.
Output Timing Characteristics
The sampling point is swept automatically within a 1.5 clock period to
generate a "bathtub" curve. The resulting graph is centered around the
optimum sampling point of the port.
In addition, the results are available in a tabular view. If a clock signal is
defined, the software measures the data to clock alignment and displays
the absolute delay.
Jitter Characteristics
The DUT Output Timing/Jitter measurement calculates the different
components making up the jitter:
• Random Jitter (RJ)
• Deterministic Jitter (DJ)
Example Results
The following illustration shows the resulting graph of a typical DUT
Output Timing measurement:
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