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# System specifications
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# System specifications
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- 5 inputs, TTL with 50 Ohm termination.
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- 5 inputs, TTL with 50 Ohm termination.
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- Time tags (64 bits) apply to rising edges of inputs.
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- Time tags apply to rising edges of inputs. They are made of two
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parts: 32 bits for the UTC second and as many bits as needed for the
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fractional part within the second (will depend on final choice of
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resolution).
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- 1 ns resolution or better.
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- 1 ns resolution or better.
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- Accuracy (of time-tag differences between channels): */- (500 ps*
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- Accuracy (of time-tag differences between channels): */- (500 ps*
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timebase accuracy).
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timebase accuracy).
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