M
moby
Any Tekxperts out there ?. I have a 2445 with a wierd trace problem.
Trace 3 and 4 are fine, but 1 and 2 have a wierd modulation on them -
independent of the attenuator setting but fixed frequency (changes with
the timebase setting) in the ultrasonic region. Oddly, if the traces
are positioned halfway up the tube, they are ok, but as moved higher or
lower they get worse the further from centre. The amplitude gets less
as the scope warms up but it doesn't go away. It looks like this :
http://homepages.kcbbs.gen.nz/moby/Tek2445.JPG
Any insights appreciated
Cheers
M
Trace 3 and 4 are fine, but 1 and 2 have a wierd modulation on them -
independent of the attenuator setting but fixed frequency (changes with
the timebase setting) in the ultrasonic region. Oddly, if the traces
are positioned halfway up the tube, they are ok, but as moved higher or
lower they get worse the further from centre. The amplitude gets less
as the scope warms up but it doesn't go away. It looks like this :
http://homepages.kcbbs.gen.nz/moby/Tek2445.JPG
Any insights appreciated
Cheers
M