[time-nuts] No 1 PPS output on a Tbolt
bruce.griffiths at xtra.co.nz
Mon Feb 8 01:56:44 UTC 2010
John Ackermann N8UR wrote:
> Sal, what sweep time are you using on the scope? I believe the TBolt
> PPS is only microseconds wide, so you may need to speed up the sweep
> time to around 100us/div or faster to see it accurately. And you may
> need to mess with delaying the sweep to get the pulse on the screen.
You would need to delay the sweep by 0.999999s to get the leading edge
on screen if the internal scope vertical delay line is insufficient.
With a sweep speed of 2us/div the entire pulse is clearly visible (even
without a viewing hood and light from a window (overcast sky) falling
directly on the screen) without any delayed sweep.
NB trigger on the leading edge which has a positive slope.
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