UU9.8

Super UU9.8 filter common model inductor

Feneng factory have capable to customize UU9.8 filter common model inductor for buyers.please send  your specification or drawing.

First of all, according to the product test on the customer's PCB board, EMI defective products are all common mode with low inductance. If the products with qualified inductance are replaced, EMI is all PASS. It can also be judged that the low inductance causes the EMI defects of the customer's products.
Generally, there are three reasons for low sensitivity:
Less number of turns
Short circuit between turns, resulting in reduced actual winding number
Foreign matter or damaged magnetic core
Improper glue, resulting in uneven glue on the magnetic core tension, lead to poor magnetic core interface.
Through the actual disassembly and testing of the defective products, it can be confirmed that the winding number is correct, the magnetic core is intact, and the factory report of QA shows that 100% of the products have not been found defective in the test. Therefore, the above items 1, 3 and 4 can be excluded to cause low product sensitivity.

Good package as following 

Tips: Improve the UU9.8 filter common  model inductor countermeasures
For the wires in stock of more than 3 months, all the wires should be pinhole tested before going online, so as to prevent the use of defective materials online in advance.
Warehouse inventory must follow the principle of first in, first out.
Modify the operation process, first test the high pressure and then test the sensitivity, in order to prevent defective products found out of the factory.