[time-nuts] fts 4050 performance
Christopher Hoover
ch at murgatroid.com
Sun Jul 30 15:33:30 EDT 2006
Brooke wrote:
> If the source of a pulse is 50 Ohms and it's TTL level at
> open circuit ( 0 to 5 volts) and the load is 50 Ohms, then
> when you connect a 50 Ohm load the pulse is 0 to 2.5 volts
> and so setting the trigger to 2.5 volts is just on the edge
> of not working.
Oops. I mistyped.
The Channel 1 trigger level is set at 0v25 and not 2v5 as I said before.
(What's an order of magnitude between friends?)
The pulse is from my TADD-3 (driven by a Z3801A).
> It's best to put a "T" connector and have a
> look with a scope. If the above is the case then a trigger
> level of 1.25 might work better.
Good idea. Will do.
-ch
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