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Default Tektronix 2465A Channel 1 problem

Hello,

I have the following problem on my 2465A.
When I am connect ch1 and ch2 to the calibrator, ch2 displays a
rectangular signal and ch1 displays something that becomes a
triangular signal when I increase the frequency.
I have put pictures on:

http://scalbert.dyndns.org/IMG_0004.JPG
http://scalbert.dyndns.org/IMG_0005.JPG
http://scalbert.dyndns.org/IMG_0006.JPG
http://scalbert.dyndns.org/IMG_0008.JPG

Sorry, pictures are not very good.

Any ideas ?

Thanks in advance,
Olivier

 
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