Products > Test Equipment

A look at the Uni-T UT210E

<< < (145/177) > >>

Martin72:
Does anyone try this one:

https://www.amazon.de/Entmagnetisierer-Reparatur-Entmagnetisierungswerkzeug-Magnetizer-Degaussing/dp/B07N853ZB6

RoGeorge:
You can as well use a Neodymium magnet and swing it to alternate the pole exposed to the instrument.

Start from very close and slightly move the magnet further and further away, slowly, while alternating the poles until the magnet is a meter apart or so.  The idea is to have alternating N-S-N-S... exposure while the intensity of the magnetic field slowly fades away.

cdev:
I have two degaussers, one is meant to be used with tape heads in a cassette tape deck, and the other is for bulk erasing tapes. Either one would likely work.

Back in the days of CRTs, it was also common to have large coils, shaped like a ring around the size of a tabourine, for for use in front of a CRT screen.

Many monitors also incorporated a degausser.

joeqsmith:

--- Quote from: brainwash on July 05, 2020, 12:29:55 am ---Hi Joe, I bought the UT210E based on your videos :) Unfortunately I have never seen a tape eraser in my life, not that I remember.
RoGeorge: I gave all those chunky soldering irons away a long time ago :)
I'm 3d printing right now a 1/4" toolbit insert with 4 slots for 5x1.75mm magnets, hopefully this will do the trick.

--- End quote ---

After I magnetized the head the first time, I was able to get it close enough to use the null with just a magnet.  It took several attempts and still had a fairly high offset.  Someone else on the forum had posted about trying spinning magnets as well but I am not sure how it worked out for them.   

I wanted something similar to the one that is integrated with my old Tektronix clamp where the whole head is in the field and the decay was programmed.  In my case, just using PTCs and some number of turns based on our line voltage.    The video shows the waveforms and amplitudes I ended up with.   


--- Quote from: cdev on July 05, 2020, 11:17:07 am ---How is the UT-210E able to be used to capture data at higher frequencies, say for capturing control loop signals?  How fast can it capture signals?

--- End quote ---

 :-//  Even if the 210E couple capture signals,  you would need to supply a LOT more information about your specific requirements.   From your post, it seems like the wrong application for this clamp.  Even if you added a buffered analog output like I have shown, you are still limited to about 2KHz.    It's possible to increase the BW of the 210E.  I managed to push the 3dB point up to about 100KHz but that's not a simple change for the novice.   Honestly you would be better off buying the right tool.   I would just start a new thread explaining your requirements.   

Depending on your requirements, you may be able to make something.

brainwash:
I've ordered the Amazon demagnetizer - from a direct overseas reseller, it will take 1 month to get to me but it's not that critical.

I've designed and 3d printed this part: https://www.thingiverse.com/thing:4524771 - which I've used on the meter. It took a bit of practice on a magnetized screwdriver to get it to work. I've then adjusted the trimpot on the back. Not sure in which order it should be done, bur now I get about 100mA variation depending on meter orientation while it was only ~20mA a few months ago. I don't think the Earth has changed that much since then. That means, I get -60mA in one orientation and up to +60 or even 100mA on other orientations.

For relative measurements it's perfectly fine, but the annoying thing is that I always have to subtract that offset mentally. As soon as I zero the meter using the button, I lose the 6000 count and it reverts to 2000 counts with the "O.L." display. But it's a minor issue.

I've also slowly nulled out the meter using a magnet but was looking for something more reliable. I might resort to the transformer trick if the newly ordered demagnetizer doesn't do the job.

For other people, please see my post above about decreasing the continuity latency, it really improved on the meter's usabilitu.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod