User Manual

CHAPTER 3. OPERATION 18
Example Resistance Accuracy
Z = 60mΩ (3.6)
Z
range
= 60 ± [60mΩ ∗ 0.006 + (0.003 ∗ 300mΩ)] (3.7)
= 60 ± (.36 + .9) (3.8)
= 60 ± 1.26mΩ (3.9)
Accuracy =
1.26
60
∗ 100% ≈ ±2.1% (3.10)
3.5.2 ality and Dissipation Factor Accuracies
Q
x
is the measured value of Q
D
e
is the accuracy of D as calculated
The dissipation factor accuracy depends on its tested value.
D
x
≤ 0.1 D
e
= ±
A
e
100
(3.11)
D
x
> 0.1 D
e
= ±
A
e
100
∗ (1 + D
x
) (3.12)
The accuracy of Q is derived from D.
Q
e
= ±
Q
x
∗ D
e
1 ∓ Q
x
∗ D
e
(3.13)
3.5.3 θ Accuracy
Measuring the phase angle (current to voltage) accuracy depends directly on the accuracy of the impedance
measurement.
θ
e
=
180
π
∗
|Z
acc
|
100
degrees (3.14)
3.5.4 Example baery measurements
A PowerSonic PS-1270 baery of unknown origin connected to a BA6011.
Measured at Slow speed
V = 12.958V (3.15)
R = 18.194mΩ (3.16)
C = 176mF (3.17)
D
x
= 20.14 (3.18)
To determine the accuracy of each measurement, use the specifications Chapter 6.
The range seing is 30mΩ.