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 _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
