On 05/01/2012 16:49, David wrote:
On Thu, 05 Jan 2012 01:44:13 -0800, Hal Murray
<[email protected]> wrote:
[email protected] said:
Have an older Tek 465 scope that is in only "fair" shape and I see nothing
on that pin but milivolt level sine wave of about 60MHz. I can't set the
scope to show any hint of a PPS ...
I do have a 465. You should be able to see a 1 uSec PPS.
60MHz is about a 6nS rise time and is easily fast enough to see it.
Now turn up the Intensity until you can see the pulse. It might help to turn
down the room lights.
This is the problem. With a 1 second repetition rate, the brightness
is going to be very low.
The old ways of viewing such a low repetition rate signal include
using a hood or dark room, special CRT phosphors, photographic film,
MCP (micro channel plate) intensified CRTs, and of course analog
storage and later digital storage.
I agree, I've seen it in a Tek 7623A with the storage on, it is quite
difficult without it.
Regards,
Ignacio, EB4APL
PD. Just trying to verify this I made some error and let the magic smoke
leave the unit. It is still smelling ...
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