Step by Step How to Use a Digital Multimeter / Oscilloscope for Azimuth Adjustments


So I did the usual azimuth setup for a VPI using the rod on top of the tonearm groove (method of setting that is included with VPI turntables from factory) on my VPI Classic 3.   I also bought one of those clear blocks on Amazon with the lines so you can get it as flat as you can visually.   It does sound good just doing this but I wanted to go next level and see if I could do it electronically even better.    I have read you can use a digital multimeter (DMM) or oscilloscope to do the adjustments.   I found on Amazon a Hantek 2D42 that has both features and I bought the BNC to RCA connectors for it so I can interface it with my turntable or alternatively the preamp output on my Sutherland 20/20 for boosted signals.
That all being said, how do I use this for setting the azimuth?   I have read you can use either device (DMM or Scope) to do this adjustment but it seems like the directions are pretty sketchy on how to do it.
I looked into buying the Adjust + software but as of August 2021 it isn't available to buy any longer so that isnt an option.
Anyone know how I can use this Hantek to do the testing and adjustments?
Thanks in advance,
Jason
newguru

Showing 1 response by newguru

So lewm, regarding your response, I have in my hands the Acoustic Sounds test LP already so I can do the stereo, left and right channel 1K hertz test tones.
In your post you said, " Also, keep in mind the obvious fact that you would like to insert your meter or scope as close to the cartridge output as possible. If you readout at the phono stage outputs, then you are including any inequalities between the two channels of your phono stage in the data. On the other hand, trying to read the microscopic voltages from an LOMC cartridge directly can be frustrating or impossible if you want repeatable results. It's easy with high output cartridges and good instruments."
Based on this, with my Hantek, I'm wanting to use it in the oscilloscope or digital multimeter mode?   I dont know if it is sensitive enough to read out the turntable directly or not.   My cartridge is the Soundsmith Zephyr II which is a low compliance, high output cartridge.  Output on the spec sheet is output voltage of > 2.2 mV @ 5/cm/sec.
This is where I'm technically inept as far as knowing if that is enough for this Hantek to read out at the turntable or not.  I'm guessing it wont go low enough as it says, " VOLTS/DIV Range: 10mV/div~10V/divat input BNC ".   This is 2.2mV output so lets assume I have to measure out of the Sutherland 20/20 outputs instead to get readings.