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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