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Author Topic: Oscilloscope MRL Azimuth adjustment  (Read 5501 times)

2496

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Oscilloscope MRL Azimuth adjustment
« on: November 13, 2006, 08:18:41 am »

Hi, I just bought a used (1989)Tektronix 2335 2 channel (XY) scope. I bought this mainly to adjust the azimuth on my Studer A80 24 track with a new MRL test tone tape. Never using a scope before, I was assuming that I would simply hook up track 2 to X and track 23 to Y and see a phase pattern to adjust to. What I see are 2 sine wave patterns. After reading alot of info on line I've discovered that some people are suggesting that you need a scope that will allow you to disable the automatic sweep function so you can monitor phase, not a sine wave. I'm not sure that is possible with this particular scope. Also some are saying to adjust to white noise (which is also on my test tape)not a 1K and then 10K tone. Any thoughts? Thanks
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dcollins

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Re: Oscilloscope MRL Azimuth adjustment
« Reply #1 on: November 13, 2006, 07:07:26 pm »

2496 wrote on Mon, 13 November 2006 05:18

Hi, I just bought a used (1989)Tektronix 2335 2 channel (XY) scope. I bought this mainly to adjust the azimuth on my Studer A80 24 track with a new MRL test tone tape. Never using a scope before, I was assuming that I would simply hook up track 2 to X and track 23 to Y and see a phase pattern to adjust to. What I see are 2 sine wave patterns. After reading alot of info on line I've discovered that some people are suggesting that you need a scope that will allow you to disable the automatic sweep function so you can monitor phase, not a sine wave. I'm not sure that is possible with this particular scope. Also some are saying to adjust to white noise (which is also on my test tape)not a 1K and then 10K tone. Any thoughts? Thanks


You need to put the scope in "X/Y" mode.  Turn the sweep speed knob fully clockwise.

DC

2496

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Re: Oscilloscope MRL Azimuth adjustment
« Reply #2 on: November 13, 2006, 07:09:34 pm »

Got it! Thanks
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Larrchild

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Re: Oscilloscope MRL Azimuth adjustment
« Reply #3 on: November 14, 2006, 12:08:27 pm »

Don't just use tracks 2 and 23. A phenomenon called "gap scatter" means all the head gaps are not perfectly aligned, vertically.

Take all 24 faders, pan 1-12 to the left and 13-24 to the right and use the scope across the 2-mix. This will average out the gap-scatter.
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Larry Janus
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