[time-nuts] No 1 PPS output on a Tbolt
Bob Camp
lists at cq.nu
Fri Feb 12 13:05:26 UTC 2010
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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