[time-nuts] Trimble Thunderbolt 1PPS TTL level?
Arnold Tibus
Arnold.Tibus at gmx.de
Sat Aug 30 14:12:23 UTC 2008
On Fri, 29 Aug 2008 22:21:43 -0400, 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
Hi Pieter,
there is nothing to be worried about, I have the same problem with my
53132A, it does not trigger on it with 50 ohms or high impedance load.
So I tried it with the 5334A - no problem at all ! It does trigger as expected,
without any signal loss.
Seem to be a problem of the 53131A/ 53132A series counter.
regards,
Arnold
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