278 Keysight M8000 Series of BER Test Solutions User Guide
5 Setting up Generator
The following figure clarifies the behavior in the range between 615 Mbit/s
and 620 Mbit/s:
For the generator the following rules apply:
• Below 620 Mbit/s, the Generator can only be operated with an external
clock source, because the internal clock source can only produce
signals higher than 620 Mbit/s.
• The trigger output cannot be set up to trigger on certain pattern
positions or pattern sequences. If this option is enabled (for example in
the user interface), the trigger is sent once for each pattern, but the bit
position cannot be specified.
The option to trigger on the divided clock signal is supported as usual.
• There are restrictions to the available clock to data delay values.
The Generator can vary the clock to data delay only within a range of 10
ns (relative to the clock signal). For frequencies above 666 Mbit/s, this
range is sufficient to cover the complete clock cycle (= 1 unit interval).
For lower frequencies, the valid data delay range is smaller than the
clock cycle. The Generator cannot generate signals with a delay outside
this range. Therefore, the data delay cannot be set to all values within
the clock cycle.
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