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Old 16th January 2013, 03:07 PM   #11
diyAudio Member
Join Date: May 2011
Location: Quebec
No, it seems internal parasitic somehow leaking... Knowing that, and because I only use it for audio purpose, I just use it as is.

I'm not even certain that there's a problem with it as when I look at other DSO images, they never appear to be perfectly flatlined...

I adapted to it
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Old 16th January 2013, 04:29 PM   #12
gootee is offline gootee  United States
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In case you're ever looking for something to do, you might want to look for any electrolytic caps and replace them, especially if they are near the digital-to-analog convertor section.

Last edited by gootee; 16th January 2013 at 04:31 PM.
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Old 16th January 2013, 04:38 PM   #13
tomchr is offline tomchr  Canada
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I don't know the 2440 well enough. But a common problem with the 2465 series is dried out caps in the power supply. The 2465B I have was in the surplus pile at work because it had failed calibration. I think at first, it wouldn't even turn on. There was an auto-shutoff that triggered and turned the scope off (AFAIR, it's been a while). When I did get it to turn on, the trace was very noisy - but in my case it was more of a fat band rather than the quantization noise you're seeing. It was caused by excessive ripple resulting from dried out caps. $20 later, I had a perfectly good working 400 MHz scope.

Don't adapt to broken tools. Just get the service manual and fix it. The CRT is good so you won't have to mess with high voltage circuits (aside from perhaps some mains voltage in the supply section). My bet is that you have a dead supply or bypass cap somewhere. Just replace them. They're cheap.

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Old 16th January 2013, 10:27 PM   #14
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Thanks for the advices. I have the service manual, but I'm kind of scared of making the thing worse. I may open it when my amplifier project is done...
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