I see that on many counters (e.g. SR620, HP 5370, HP 5372) the external frequency standard input has an impedance of 1Kohm. Why such a high value? Are they implying that it's acceptable to daisy-chain a single reference to multiple devices like an old 10Base2 ethernet network? Should such a link be terminated in 50 ohms like a 10Base2 network?
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