Sal:
I agree with Bob's suggestion below. Set your trigger mode to normal
rather than auto and use DC coupling, not AC. Set a slow sweep speed so
it's easy to see (maybe 10ms per division). You should see a sweep
every second. By varying the trigger level control you can get an idea
of the pulse's voltage even if you can't see it.
Ed
Bob Camp wrote:
HI
A lot depends on just how tired the tube in your scope is. Some of these scopes
have spent a lot of hours turned on and wearing out the filament ....
The easy thing to do is to vary the trigger point and watch the "trigger" light. It should tell you if the pulse is there or not. If it's not, then either it's turned off or there's something keeping the electrons from getting to you (like a blown chip).
Bob
On Feb 7, 2010, at 8:56 PM, Bruce Griffiths wrote:
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.
John
----
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.
Bruce
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