Transformer test ratio

[engineer1000]

On a transformer specification the primary turns = 43 and the secondary = 30. The test ratio of 0.837.
I'm a bit confused as to what this figure is. As 30/43=0.697 so it's not the turns ratio.
Can anyone enlighten me please

 

[albbg]

Are you sure 43 and 30 are turns and not the primary and secondary inductances ?
In this case, since L is proportional to N², then:

N2/N1=V2/V2=sqrt(L2/L1)

sqrt(30/43)=0.835

 

[engineer1000]

Are you sure 43 and 30 are turns and not the primary and secondary inductances ?
In this case, since L is proportional to N², then:

N2/N1=V2/V2=sqrt(L2/L1)

sqrt(30/43)=0.835

Sadly not definately the turns ratio

 

[albbg]

could you post the complete specs ?

 

[engineer1000]

could you post the complete specs ?

Apply 43 turns to the primary using 32/0.112 litz wire
Apply two layers polytester tape
Apply 30 turns to the secondary
Apply black acetate black tape
Voltage proof at 2kv between windings
test turns ratio and polarity
TEST RATIO = 8.37
That's about it

 

[rfredel]

Hello engineer1000,

how do you test the turn ratio?

Can it be, that you get a feetback between your measure frequency and the inductance of the winding. So you get a higher voltage and and the fault in your measure.

Regards

Rainer

 

[albbg]

Yes, at a first glance I didn't focus on the word "TEST". As rfredel said it could be something related to the measurement method. Anything is written about testing ?
By the way, in the last post you wrote test ratio=8.37, while in the first it was 0.837 which one is correct ?