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Has anyone used an oscilloscope to align for zenith and azimuth?

Posted by tonyptony (A) on November 29, 2015 at 19:12:23

I own a scope and I know how to use it for the normal sorts of things, but up until now I've never tried to use it for aligning either the zenith or the azimuth of a cartridge. I know a DVM could be used for azimuth, but based on what I've read so far it looks like I should be able to do both on a scope. The problem is that I've found conflicting information online for what sorts of signals to use - and how to set up the scope for them. Here's what I think needs to be done for each:

For azimuth it seems like there are two approaches. I could use single channel sine wave tracks (like on the Ultimate test record) and set up the scope so that Channel 1 is looking at one signal channel and Channel 2 the other. In this scenario scope Ch.1 will be maximized and Ch.2 will be near zero (hopefully) for one test track, and the opposite for the other. The idea would be to adjust cart azimuth to try and get them to be about the same, with the goal being to keep the non-signal channel as close to zero Vrms as possible. A voltage to decibel conversion chart would be used to put the channel balance result in terms of dB.

The second way for azimuth is apparently to use a L-R track, but it's not clear to me if I do it that way, what to do with the scope. Do I add the two channels together and adjust the azimuth until it goes to zero? Not sure.

For zenith, it seems like the way to do that is to use a L+R equal amplitude (mono) track and look at both signals on the scope. The goal for this is to adjust zenith so that the two signal are time aligned.

If anyone has done this using a scope, I'd appreciate any confirmations or corrections.

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