How to judge the quality of network transformer? What symptom is network filter transformer broken?

Hqst Yingsheng electronic guide ： In Ethernet devices , adopt PHY Pick up RJ45 when , A network transformer will be added in the middle , So how to judge whether the network transformer is good or bad , And what is the general symptom when it is broken ？

that How to judge whether the network transformer is good or bad ？

This should be discussed from two dimensions

One is the application of network transformer , That is to say, for non professional network transformer manufacturers, namely network transformer customers , Traders , How to judge the quality of the network transformer through non professional methods

 1, In the application phase , The signal of the product suddenly is poor or Gigabit becomes 100m , The transmission distance is too short , We can check whether it is caused by network transformer and other reasons

2, If we now have a batch of unused network transformer products from unknown sources , The quality of this product does not belong to the ability of our terminal to identify and judge the quality itself , The best way is to find a professional network transformer manufacturer to conduct comprehensive product inspection and identification , The aspects of identification can also be divided into two levels

One aspect is the product appearance , Such as PIN Foot flatness , appearance , Packaging is good or bad , Tinning , Wire package , The thread ends are broken , A short circuit , Failure to clean leads to corrosion, etc ,

The second level is to test the electrical parameters of the product , Such as withstand voltage , inductance , Lap ratio , Equilibrium value ,PS, And the network parameter insertion loss of the product , Return loss, etc .

16PIN Ultra thin industrial network transformer H0068NL

What are the symptoms of a broken network transformer ？

After the network transformer broke down on the communication equipment application motherboard , Network communication will lead to various undesirable products , Such as increased signal noise , The network transmission rate decreases , Gigabit to 100m , The network port is blocked

  For professional network transformer manufacturers , Different problems will show different parameters , Such as test after short circuit PS however , The inductance value is too large or too small , Insertion loss , Return loss parameters are not up to standard , The transmission of network communication signals reflects various defects , Poor voltage withstand, no surge at the mouth, etc

For network communication equipment , After normal use, there are sudden problems, such as network signal failure , Rate reduction can be considered as network transformer product damage , But it can only be listed as one of the problems to be checked , For a communication motherboard with many components , Sometimes the problem is not just a component problem , So there is not much reference significance for using individuals to solve this problem

For the network transformer product itself , The quality of a single product does not have much reference significance , We need to consider the manufacturer's overall quality control standard for the batch of network transformer products , Yes Hqst For Yingsheng Electronics , Our basic standard for quality control of network transformer products is to control the electrical defect rate within 0%, No defective product is allowed to flow out of the product line , Access terminal . The overall rate of all other defects such as appearance shall be controlled to the highest 800PPM following , Strictly speaking, we should control in 300PPM With a total defective rate of three tenths of a million