Does the noise go away if you engage the bandwidth limiter (pull out the "Trig View" button)? Does it go away if you disconnect the probes and set the coupling to GND? If so, then you're just picking up high-frequency hash though the probes, which is not uncommon.
-- Mark
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--- In TekScopes@..., "rebelliouszombie" <santosismael@...> wrote:
Thank you for your response. I posted some pictures in my album (rebelliouszombie_album). I don't know how to add attachments.
It's hard to see in the pictures, but the traces are wide and noisy. I notice that if I move the probes' cables around, I can decrease or increase the width of the traces. I used the oscilloscpe's square wave signal, but the same thing happens if I use a function generator.
--- In TekScopes@..., "simoniep" <fcbtt3.nina@> wrote:
Hi
Please post a picture of the screen.
Pascal
--- In TekScopes@..., "rebelliouszombie" <santosismael@> wrote:
Hello.
I have a Tektronix 465 with a wide and noisy trace on both channels. I cleaned the contacts on both channels and there was a slight improvement. I also fixed the coupling selector for Channel 1 (the mechanism was jammed). Everything else appears to work fine, including the triggering.
I need advice on where to start the troubleshooting. I have the original hardcopy of the service manual. Thanks for the advice.
