Help with HP 4951B protocol analyzer + 18179A

[Roy J. Tellason]

On Friday 17 February 2006 10:53 pm, John Allain wrote:
> > For video applications, you need a 75 Ohm plug. Almost all other
> > appications (test equipment, ethernet) use 50 Ohm.
>
> Sounds a little off.  Cables are important, with impedance
> varying with diameter, _Terminators_ are important, coming
> in the 50, 75 Ohm varieties mentioned, but the connector
> itself being 50 or 75 Ohm?  First I've heard of this.
> The connector rear half can come in sizes to match the cable
> OD, that's about it by my understanding.  A mechanical, not
> electrical difference.
>
> John A.
> important?  probably not.  thread drift?  probably!

And then there are the couple of ARCnet cards I have around here someplace,  
along with terminators (I hope!),  that are using 62 ohms impedance...

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