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Registered Member #58280
Joined: Sat Jan 09 2016, 06:48AM
Location:
Posts: 43
I have a dispute with an eBay seller of powered iron toroids. He says that a toroid that I bought is a type T300-2. I doubt it's type 2 powered iron, because those are traditionally painted red, while what I bought was grey.
Anyway, I wrapped about 80 turns around the core, and got an inductance of 130uH and an Al of 21, measured at 200kHz with a DIY Atmega168 based transistor/RLC tester. The Al of T300-2 is supposed to be 11.4, which would give an inductance of 70uH. So my experimental value is 86% higher. Another thing I did was make a crappy transformer out of it. I found that the highest output was around 1.2Mhz, sharply decreasing under and over.
So is this type 2 material?
EDIT: I tested a known type 2 core, T130-2, and calculated an Al value exactly the same as the datasheet value. So now I'm doubting this seller's claim. What is that core really made of?
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
If it was advertised as a "Micrometals T300-2" then you have received the wrong item (wrong colour and inductance value) Micrometals do not have copyright on Txxx-xx so any manufacturer can have their own version. Look carefully at the advertisement.
Registered Member #58280
Joined: Sat Jan 09 2016, 06:48AM
Location:
Posts: 43
It was advertised as Micrometals T300-2/97. I, and the seller, assumed it was some production code or something. I can't find reference to a 2/97 anywhere on the micrometals website.
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
Chris_Knight wrote ...
It was advertised as Micrometals T300-2/97. I, and the seller, assumed it was some production code or something. I can't find reference to a 2/97 anywhere on the micrometals website.
Could it have been made in February 1997? also, is it possible to ask Micrometals for their opinion?
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Is this seller telling the truth? (Toroid material type)
