Agilent Technologies N4906B Serial BERT User Manual page 66

Setting up the Pattern Generator
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If the clock frequency falls below this threshold, the current data
delay value is checked for validity. If the delay does not fall in the
valid range, it will be moved into the valid range. All subsequent
changes to the data delay will be checked for validity and rejected if
invalid.
Bit Rate – Procedures
You can use an external clock source or the Serial BERT's internal
clock to control the bit rate.
To set the bit rate:
1 If the external clock source has a frequency of 10 MHz, connect the
clock source to the pattern generator's 10 MHz Ref In port. If the
clock has another frequency, connect it to the Clock In port.
2 Click the Bit Rate Setup icon in the PG Setup menu.
3 Select the appropriate clock source:
– Internal Clock Source
– External Clock Source
– External 10 MHz Reference Clock
4 Select a clock rate:
– For Internal Clock Source, you can either select a clock rate from
the Presets list, or enter a clock rate in the Value and Units field.
– For External Clock Source, the clock rate of the external source
is used.
– For External 10 MHz Ref Clock Source, the clock rate connected
to the 10 MHz Ref In port must be 10 MHz.
The selected clock rate applies to the pattern generator. This is also
the clock rate generated at the pattern generator's Clock Out port.
If the error detector receives its clock from the pattern generator, it
runs at the same clock rate.
Agilent N4906B Serial BERT, User's Guide, October 2005
Bit Rate