[Gold]

I have a Tek TAS 465.  It was an evil bay special. The display has always had a blinking quality to it. In the photo you can see it’s not a crisp trace.  There are light and dark parts.

Then today I got that superimposed low frequency wave. The tone is 10K. I was driving myself nuts trying to figure out what i was seeing. I then removed the DUT and it was still there. I power cycled the scope and it went away.

The text on the display also looks wobbly.

Do you think if I get the scope calibrated it will take care of these display issues or does it need to be looked at in more detail. The calibration houses don’t do “restoration “.

[scott2000]

This guy has a quick video on this unit. Maybe you could reach out to him for any direction on what to look at .

https://www.youtube.com/watch?v=qLMkh0R9hsg

[Gold]

Thanks! It looks like he is dealing with the same sort of display problems I'm having.

[Whoops]

Hi Paul,
try out the EEV blog forum, a lot of Oscilloscope gurus out there and also a lot of threads on that specific model.
I think you will find the solution there or can get good help in solving it

[Gold]

I’m a little embarrassed to say but power cycling  the scope fixed the problem.

[cyrano]

I had a very similar situation a while ago. 125 kHz, not 10 kHz. Spent days looking for the culprit.

It wasn't until I moved the equipment that I realised it was only present in that one spot in the room. Turned out the culprit was a VFD driving the big sewer pumps under the road.

I've moved my equipment to another spot in the room. No more problems.

It made me curious and I found two other spots in the house where the same interference is present. Both are 3-phase circuits that are no longer used. The first one, however, has not 3-phase circuit near. At least, as far as I can tell.

Even my Fluke DMM behaved strange in that spot. Showing up to 6-7 volts on the DC range, with the leads attached to nothing.

[Whoops]

I’m a little embarrassed to say but power cycling  the scope fixed the problem.

Well if it works it works
Glad it's sorted

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