[time-nuts] No 1 PPS output on a Tbolt

[Bob Camp]

Hi

Of course the other option is to *finally* break down and buy a digital scope. They've been out there for > 20 years now. 

Yes, I did indeed cross over to the dark side last week....

Bob

On Feb 12, 2010, at 7:24 AM, Peter Vince wrote:

> Hi Robert,
> 
>     I put a dual-colour (red-green) LED in a BNC plug for just this
> sort of purpose.  No series resistor - the 50-ohm source impedance
> limits the current nicely.  With dual-colour, I can see both positive
> and negative pulses.  100ms pulses are perfect, 10ms OK, 1ms are very
> dim, but there is no chance of seeing the 10us pulses from the
> Thunderbolt.
> 
>     As others have said, I set the (analogue Tek 2445) 'scope to
> 10us/div, 2 volt/div, 50 ohms, DC positive edge trigger, and waggle
> the trigger level.  The display is dim, but visible.  A slightly
> slower scan would narrow and brighten the pulse on a tired tube.
> 
>     TTFN,
> 
>          Peter
> 
> 
> On 8 February 2010 15:15, Robert Darlington <rdarlington at gmail.com> wrote:
>> Try hooking the output to an LED.  It's very difficult for me to see the
>> pulse on my analog scopes but there is no arguing with the blinking light.
>> 
>> -Bob
> 
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