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| UT210E Problem measuring AMPS!!! :( |
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| cdev:
Looking good! Your degausser is designed for this use. Mine are for my old cassette deck and for erasing old VHS tapes. Yes, that is exactly what I meant. its basically the same thing. Maybe its unnecessary but I always turn it on and only then bring the item to be degaussed into the field, leave it there a bit, maybe move it around a bit to make sure its gotten a good degaussing and then remove it from the magnetic field, while its still energized. I am trying to not remagnetize it by breaking the circuit in the middle of a cycle while the object to be degaussed is still in the field. --- Quote from: joeqsmith on May 12, 2020, 01:15:32 am --- --- Quote from: cdev on May 11, 2020, 11:39:32 pm ---If I were you I would just make a coil with a bunch of nails and a long piece of thin wire. You can energize it with a transformer, dont use mains voltage. You dont need a super lot of power and indeed, less is more in this situation. You'll likely not need a degausser that often. You dont want to damage the UT210e --- End quote --- Obviously no want wants to damaged any of their equipment. I suspect you meant damage it from something to do with magnetizing the head or degaussing it. Care to explain? As far as what's required, I was using about 600 gauss peak with a half second decay. --- End quote --- That is definitely the way to go. |
| joeqsmith:
That is pretty much what I do. Turn it on near the thing I am trying to clear, and never turn it off until I am far away. Depending on what it is, I will rotate the eraser in the field. The homemade one was designed for this probe. You can find my build here: https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg1040540/#msg1040540 |
| cdev:
Joes's coil where you put the clamp into the magnetic field is clearly the way to go. It puts the meter right into the magnetic field. make sure you use enameled (insulated) wire and not bare copper wire which would defeat the whole purpose and likely start a fire! (joke) You can use any electromagnet, any kind at all, as long as you run it on AC, and not DC. 50 Hz, 60Hz, whatever. I being an old school kind of guy who used to dote on my audio hobby, have a tape head degausser and also a large tape eraser. Either one would do. The most important thing is safety. mains voltage of 115 v is high enough to hurt or perhaps kill somebody, 220 volts or more is at least twice as dangerous. So make sure whatever coil you use has enough length to not present a short, any demagnetizer will get warm, thats okay, but especially make sure its well insulated. When I said big coil I meant big enough to not blow fuses or melt at a bare minimum, but it shouldnt get too hot either. Dont use wire thats so thick it cant be long enough. Measure its DC resistance to make sure its high enough to not be a heater instead of an electromagnet. A good degausser will hum when you energize it a bit. --- Quote from: marce002 on May 12, 2020, 12:28:58 pm ---Hi cdev ... sounds smart solution... but can you give more details? Nails? what transformer to use i have for eg a 220v 12v from battery charger.... what cable and how many turns would you use...after that is clear.. would you pass them close trough the clamp or meant wrap the jaws or do turns like if you were measuring current.. im talking about DC measurementes. Yes the device my UT210E works perfect in all other functions that is why im so interested in its rescue. Yes im not gonna opem to touch trimpots nor update firmware wich would be great though. Joe yo know too much and showed your knowledge.. but from point of view of myself as an user i wanted just my device working at least on +- 100mah error and would be more than happy i bet with your device could be achieved. --- End quote --- |
| marce002:
ok thanks again, i think i will end up doing it with a microwave transformer with an "E" reformed core, because will be the most easy to get materials here around..... the truth is that I do know very well what to do once it is energized to 220v in the primary and an "open sky sight" to let the magnetic field scape from the core upwards.... a mean,,, should i manually get the clamp to the middle part of the core and then fast very fast rise it until the efects are far and turn it off? that in 20A scale where the offset is 5A, not in the 2A scale where i can only see 0L (out of scale) |
| cdev:
I'd use something like Joe's degaussing coil with it's added switch. Its good to mess with mains voltage as little as possible. That why I got my UT-210E to tell you the truth. |
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