Dear Jojo.

 

I'm sorry I couldn't reply you so soon.

Speak truly, I can not understand what you are asking about exactly.

If you pointed out the question a little more detailed, I'd answer more correctly.

 

However, I'd better explain the fundamental of the way to use the surge tester.

As you can see, the method of surge test is as same as the fingerprint identification.

It means at  first there must be a sample(as we say the master )whitch we can

compare the tested result to, because we can not judge the tested result by itself

whether it is good or bad, without compairing it to the sample.

 

In this case, surge test means "the Surge Comparison Test", it stands for the test

whether a coil winding product can endure the surge impulse between the start

of the winding and the end of the winding, and if there's no pinehole, or scratch,

or short (turn-to-turn, layer-to-layer, phase-to-phase short), or some fault inside of

the winding.

This test must be done to all kind of coil winding products, for example, stator, rotor

of the motor, solenoid coil, stabilizer, reactor, tank coil, ignitor, electric filter, transformer,

SMPS transformer, magnet coil, speaker, etc.

 

 

So, the first procedure to use the surge tester is to capture a sample and save it

somewhere(memory area in surge tester), and   bring it(the sample data or

waveform)  up to compare to the tested result of the Product-Under-Test every

time and judge  the PUT to be good or bad.(If the   error % is higher than the

preset limit value, the surge tester judges bad.)

 

Our surge tester has 60 data(waveforms too) save memory areas in itself.

But the real another important problem remains still, and that's what we say.

 

" What point(or value of error limit) we have to set up as it the boundary line to

judge the product to be good or bad? ".

 

Even we, KAST manufactures the surge tester, we can not say just like the way

if the product's error % comes over 10%, you have to judge the product to be bad...

It's because the appearence of error % depends on each spec of PUT, and conditions

of the sample too.

 

We can only recammend if the Q & inductance of the winding product is lower, then

preset the judgement   of limit % value more higher.

I can only say that most of the operators who use the surge tester usually preset

the judgement limit value at 10%, if  the inductance of the product is rather higher ones,

for example, magnet coil winding without the core inside of the coil( temporary released

the core or actuator from the coil winding), air coil, solenoid coil(without core)...etc..

And they usually preset the limit value at about 15~20%, when they test the inductance

or the Q of the winding of the rpoduct is rather low, as stator, rotor of a motor, solenoid

coil(where the core or actuator is inside), or some other products of which the Q is lower

product.

Mostly when some iron or conductive material surrounded the coil winding, the inductance

of the coil and Q  is low.

 

And then now, how and where can we capture the sample of the waveform and data?

what product can we set as the sample(master)?

How can we guess a product that has the qualification being  captured as the sample from?

However, we have to capture a sample data and waveform from one of the product

anyway.

At a glance, it seemes very difficult to set a product as a sample, but it is not so hard

to set a product as a sample...

Take any product as a sample which seems to be a good or standard and capture the

waveform and data, and use it as a sample, and test other products by comparing it,

until the sample is suspicious, and if you feel something strange, excange the sample,

and try again...and that will be enough I think.

Because most of the product(more than 99%) you manufacture has the qualification

as the sample, if not, your campany shall be bankrupted...suppose if  any manufacturer

that makes the fault more than 1 %, how can it keep on going well?

 

If you have further questions about the surge test, ask us anytime.

 

Thanks a lot.

 

Best regards.

 

Whowon/KAST Eng.