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Adjusting Infinity IRS servo controller

I got a request from @bobterry99 about adjusting Infinity servo controllers.  Inside the controller are 4 pots:

Left side level (amplitude)

Left side DC offset

Right side level (amplitude)

Right side DC offset

See the attached photo.  I used a 2 ch oscilloscope to monitor the input and output while adjusting.  With 4 ch, you could monitor both channels...

 

jtucker
racerxnet
54 posts
 

Here are some pictures of the Genesis Servo amp and columns. There is no service procedures on the feedback to be found. You can see the 2 adjustment pots per channel on the board. Any ideas on test procedures for this??

 

Mark

 

jtucker OP
79 posts
 

I don't have any specific info on that Genesis servo, but based on my experience with the Infinity servo, I would suppose that one pot is gain and the other offset.  I adjusted mine for as close to zero dc bias as I could get and the the gain for unity.  You will have to try them to see which one does what.  You will also need access to an oscilloscope and probes.

ervikingo
167 posts
 

and how do I set this up without an oscilloscope?

Multimeter I have! (and the plastic "screwdrivers")

 

Let me know!!!!

ervikingo
167 posts
 

Could you share insights on how to measure and set levels?

I have the same situation, I have my LF Gain at -10 to have a good balance between LF and Mid/Hi Frequencies

jtucker OP
79 posts
 

It may be possible to do this with a DMM.  Use DCV setting to adjust offset and ACV to adjust the gain.  Since you can only monitor gain or offset individually, it will be an iterative process.

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