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ryutaro.takahashi - 17:02 Wednesday 10 April 2024 (29177) Print this report
Comment to Re-cabling of BF damper (28993)

[Washimi, Takahashi]

We checked the resistance and inductance of the LVDT coils for the BF damper at the feedthrough flange with the flip cable.

  Before O4a This time

1 BF DPCH

1-6

2-7

3-8

4-9

5-G

 

25.5Ω/1.066mH

26.2Ω/1.066mH

25.6Ω/1.068mH

OL

 

 

27.8Ω/1.066mH

29.5Ω/1.064mH

27.6Ω/1.068mH

OL

~40MΩ

2 BF DPCV

1-6

2-7

3-8

4-9

5-G

 

26.2Ω/1.062mH

24.9Ω/1.067mH

24.3Ω/1.061mH

OL

 

 

29.4Ω/1.061mH

29.2Ω/1.095mH

28.6Ω/1.062mH

~70MΩ

~20MΩ

3 BF DSCH

1-6

2-7

3-8

4-9

5-G

 

24.5Ω/8.56mH

24.3Ω/8.53mH

23.6Ω/8.56mH

OL

 

 

27.9Ω/8.55mH

31.1Ω/8.53mH

27.0Ω/8.54mH

~50MΩ

~20MΩ

4 BF DSCV

1-6

2-7

3-8

4-9

5-G

 

24.2Ω/8.53mH

24.2Ω/8.53mH

23.4Ω/8.52mH

OL

 

 

27.6Ω/8.53mH

34.8Ω/8.52mH

26.6Ω/8.54mH

~50MΩ

~20MΩ

We found the breakout adapter with the lead cable had a resistance of 2~4Ω.

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