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

Pieter Ibelings pieter.ibelings at gmail.com
Sat Aug 30 10:29:15 EDT 2008


Thanks. I had a dirty BNC connector so I am now getting 5 volts and 10us 
wide. I cannot get the counter to lock. There has to be a way of getting it 
to work.



----- Original Message ----- 
From: "Arnold Tibus" <Arnold.Tibus at gmx.de>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, August 30, 2008 10:12 AM
Subject: Re: [time-nuts] Trimble Thunderbolt 1PPS TTL level?

> 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 
>>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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