[time-nuts] Trimble Thunderbolt 1PPS TTL level?

Scott Mace smace at intt.net
Sat Aug 30 02:38:06 UTC 2008


Have you tried terminating it with 50ohms?  That was the trick for mine.

	Scott

Pieter Ibelings wrote:
> Hi All,
> 
> I got a Trimble Thunderbold from Ebay and I am having trouble triggering the 
> HP 53131A. The 1PPS output shows a 10us  pulse of 1 Volt into a high 
> impedance probe. This seems low to me. Should it be 5 volts? Maybe the 
> output 74AC04 is toast?
> 
> Pieter, N4IP
> 
> 
> 
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