Selects whether the sampling of the external pattern data that is provided at
MOD-IN, is done in fixed or automatic mode.
Use fixed mode for test setups that allow operation of the external pattern
source by a clock signal that is generated by the 81150A / 81160A, or if the
external pattern source provices a clock signal that can be used to trigger
the 81150A / 81160A via the External-In connector.
Use automatic mode for external pattern sources that do not allow to tightly
couple the timing systems of pattern source and 81150A / 81160A, or that
send patterns in packets with inactivity between the data packets. See
External Patterns for more details on externally provided patterns.
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