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Omicron CP TD1
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171
Appendix
The first measuring device for tan delta was the mentioned Schering bridge [9]
(Figure 12-28).
Figure 12-28 Schering bridge
Real parts:
Imaginary parts:
C
1
C
2
R
1
R
3
R
4
C
4
R
1
1
jωC
1
------------ -+
R
3
-------------------------
1
R
4
------ jωC
4
+
jωC
2
-------------------------=
R
1
R
3
------
C
4
C
2
------
R
1
C
4
C
2
------
R
3
×==
C
1
R
3
× C
2
R
4
× C
1
R
4
R
3
------
C
2
×==
δtan R
1
ωC
1
×=
δtan C
4
R
3
C
2
------
×ω
R
4
R
3
------
×× C
2
×=
δωC
4
× R
4
×=tan

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