EEVblog Electronics Community Forum

Products => Test Equipment => Topic started by: parabuzzle on October 20, 2013, 04:15:20 pm

Title: Philips PM 3216 scope makes whining noise
Post by: parabuzzle on October 20, 2013, 04:15:20 pm

Hey guys,

So I just picked up a Philips PM 3216 for $20. Its got a broken bezel (as seems to be the case with most of these units) and the contrast plate is missing but it works! woohoo!

So, when I brought it home and hooked it up to a source It reads fine and is surprisingly close to correct given the last calibration was in 1988. The problem is that the unit starts to whine pretty hard after it warms up (about 60-120 seconds). I can't really tell where its coming from but my suspicion is the power supply.

Thoughts?

-Mike

Title: Re: Philips PM 3216 scope makes whining noise
Post by: SeanB on October 20, 2013, 05:43:35 pm

Dying capacitors most likely.

Title: Re: Philips PM 3216 scope makes whining noise
Post by: parabuzzle on October 20, 2013, 05:46:04 pm

I checked the PSU caps. They all look correct.

I channeled my father and I hit the case (like he used to do with the old TV) when the whining started and the whining went away. It hasn't come back.. ahhh.. old equipment :)