First Try at Oscilloscope

Discuss construction, troubleshooting, and operation of the Altair 8800c computer

First Try at Oscilloscope

Postby toml_12953 » April 15th, 2019, 5:31 pm

I carefully read the alignment procedure in the Shugart SA-800 manual. I set my Hantek DSO5102P (hacked to use 200Mhz) to all the voltages and divisions in the manual and connected the external trigger.
I made sure the probes were connected to the proper test points.
I inserted the Alignment disk in the drive and closed the door. Using AFEXER, I stepped to track 38 and looked for the pattern shown in the manual.
I got something but it sure didn't look like the manual! Back to checking all the oscilloscope settings. They all looked good.

Can anyone spot my "fatal" error? It took me a while but I figured it out. I FORGOT TO LOAD THE HEAD AFTER STEPPING TO TRACK 38!!!
Once I loaded the head, a good pattern showed up and I adjusted the radial alignment so the two lobes were equal in height. Simple!

A dumb beginner's mistake which I won't repeat! I just figured y'all could use a laugh even if it's at my expense.
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Re: First Try at Oscilloscope

Postby AltairClone » April 15th, 2019, 7:03 pm

Good job! Index alignment is next...
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Re: First Try at Oscilloscope

Postby toml_12953 » April 15th, 2019, 8:42 pm

AltairClone wrote:Good job! Index alignment is next...


Can't I just pretend it's already aligned? :D
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