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...

jtucker10-31-2023 9:35pm

jtucker OP Details Discussions Posts This discussion Message User 79 posts 05-31-2024 at 05:34pm Copy Comment URL Report Comment Edit Delete 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.
rob_cr500 Details Discussions Posts This discussion Message User 1 posts 09-03-2024 at 09:18pm Copy Comment URL Report Comment Edit Delete Has anyone looked at the input / output phase on their servo? I have two on the bench and it looks like they both have a 90° phase shift. Makes the 180° knob or the ± phase outputs kind of useless. Yes, those do flip 180° but that means its either +90 or -90 out of phase. These are SN's 350 and something around 850. How about knob removal? Do they just pull off? The signal gets noisy on one when you touch the knob. Grounding the pot fixes. I'm guessing they didn't remove the anodizing on that pot before installation. Anyone know of a replacement for the power switch? How close are low voltage rails. Both of these have about ±17 rather than 15.
ervikingo Details Discussions Posts This discussion Message User 166 posts 09-05-2024 at 02:15pm Copy Comment URL Report Comment Edit Delete subscribed. I wish I could understand the system to adjust it properly