Tonghui TH2840 Series - Rs Accuracy; DCR Accuracy; Lk Accuracy; Turns Ratio Accuracy

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8.3.7 Rs accuracy
when D
x
（value of tested D）≤0.1
The accuracy of R
s
is given by the formula below：
R
se
= X
x
×D
e
[Ω]
X
x
= 2πfL
x
=
xfC  2
1
Where, X
x
is the value of test X with the unit [S].
C
x
is the value of test C with the unit [F].
L
x
is the value of test L with the unit [H].
D
e
is the accuracy of D
F is test frequency
8.3.8 DCR accuracy
A(1+Rx/5MΩ+16mΩ/Rx)[%] ±0.2mΩ
Medium speed and slow speed, A=0.25
Fast speed, A=0.5
Here, Rx is the measured resistance.
8.3.9 Lk accuracy
Inductance L accuracy +0.2%
8.3.10 Turns Ratio accuracy
±At×Ar（1+1Ω/Zp+1/Q）[%]± 0.002
Fast speed, AT=0.5
Medium speed and slow speed, AT=0.25
Zp is the impedance of the measured primary inductance
Ar is the correction value of the test signal accuracy in Figure B
This accuracy index is used when the coupling coefficient of the transformer under test is 1 or close
to 1.