Electrical Impedance

Devices and appliances of interest in impedance measurement 79

Figure 3.16

The inner construction of a six-decade IVD employing three separate cores.

Decades 10

−1

(300 turns) and 10

−2

(30 turns) are wound on core 1, decade

10

−3

(200turns) and 10

−4

(20 turns) on core 2, decades 10

−5

(100 turns) and

10

−6

(10 turns) on core 3.

V

1

1

2

n

1

V

2

n

2

n

Δ

ΔV

Figure 3.17

Sum-difference voltage transformer.

80 Electrical impedance: principles, measurement, and applications

zero detector, hence precise knowledge of the transformer transimpedance

ωM is not important.

shield

core

winding ...