I also have the same issue with my Tek 465 scope. A picture was added
to your photo album:
These are my settings:
1) Set Horizontal sweep to 5 milliseconds per division.
2) Set Vertical to Channel 1.
3) Set Channel 1 to Ground.
4) Center trace vertically.
5) Set Trigger Mode to NORM
6) Set Trigger Source to Line to synchronize to 60 HZ.
7) Reduce the intensity (counter-clockwise) to a bare minimum to see the
trace.
I'm thinking +15V power supply is the culprit, but not sure.
Unfortunately, I don't have another scope to test this one. Using the
scope to test itself is no good because the blanking circuit blanks
it's own trace.
But, it's definitely caused by 60 HZ noise, somewhere...
Ron
--- In TekScopes@..., glydeck@... wrote:
Jordan,
Absolutely. If your triggering off of the mains, and the dashes
are in sync
with the mains it pretty much proves that the Z modulation is most
likely
supply hum. I would agree with your assessment of the power supply
caps being
suspect. That was the root cause when I fixed my 533A. Your 465
is truly a
great scope that you will enjoy when you get it all tuned up.
Good luck,
George
In a message dated 9/29/2008 4:45:05 P.M. Pacific Daylight Time,
jordankersten@... writes:
Also, the dashes in the lines move along the trace...if the trigger
is set
to Line, the dashes stop and the trigger led lights. Would this be
a sign that
it's AC line hum? If so, would power supply caps be the likely cause?
~Jordan~
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