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 <rdarling...@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.