Calibrating Wise 2086 wise tension head

I got this once a long time ago:
This unit is self-calibrating. In the factory, scientific equipment is used to set the calibration before the unit is shipped. In the event you feel calibration is necessary this can be done without returning the machine. But unless you have extremely accurate calibrating equipment, it is notrecommended that you perform this function. A spring calibrator is not considered accurate enough to calibrate the 2086 Pro and you will misalign the machine using just this as a measuring tool.

Calibration should be performed at 70 – 85 pounds.

1. Using string, start a pull as normal, when the unit has reached the set tension press the Pause button.

2. Press the Test key. The display will flash 111 to confirm you are in the Calibration mode.

3. Use the Up/Down keys to make the display match the precision calibrator you have mounted between the gripper and the racket.

4. To save the new calibration value press Test once again. You now have 9 seconds (as counted down on the display) to press the Speed key, then the Pound key. The display will flash 999 momentarily to indicate the new calibration data is saved.

5. At any time when in the Calibration mode, pressing the count key will return all factory settings. Or, pressing the dimpled (start) key or foot switch before saving the data will discard the new value and return to the previous setting.

 

Uh, I think the better option is to calibrate it with higher tensions.
Long time ago that I calibrate a Wise, but as far as I can remember, I tried to calibrate it with lower tensions. Because my machine was a Pros Pro Pioneer with crappy clamps and nothing holds tensions with 70 lbs. After calibration the head was still off a few at some tensions. Later I calibrated it again at higher tension with holding the calibrator at the main support and the result after it was much better.
But this was years ago... Maybe the software/hardware changed and you can calibrate it with lower tensions too.

 

12 sounds familiar to me. But not sure. I sold mine ~9 years ago...

 

What do you measure when you set it to higher tensions like 50-70 lbs.? Is it still off by 1 lb?
The 70-85 lbs. for calibration is the manufacturer's recommendation so I guess they have a reason why they do suggest that. Although I don't see a major problem if you do it on lower tensions and see what happens. If it's accurate afterwards, then job done. If not... then repeat the process with a higher tension.

And don't bother with the version. They made a significant update in the mechanics with V14 in ~2019 (I think...), the versions before were pretty much the same in the machincal construction so the calibration process should be the same.

 

I had the best experience with cheap Tennis multifilament strings. Overstretching before calibrating this strings is important.

This is my setup:


With that, you can go to 90 lbs without problems.

Where do you fixing the other end? On the main support or with a string in a clamp?

 

Should be also good, if the scale is accurate

 

Calibrate it at the highest tension you intend to use.

I did mine when I got it because it was an ex-demo, but it wasn't far enough out to make much difference; I think I reduced it by a couple of tenths, and I used string that had been pre-stretched to buggery with absolutely no slack left in it.

 

Most machines only resolve to 0.5 lb.

 

Anyone knows how to calibrate Wise series-14?
I tried the instructions above, but once the tension is reached, pressing on "test" does nothing.