Title:
VOLTAGE MEASUREMENT DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/173051
Kind Code:
A1
Abstract:
The present invention comprises: a clamp part 2; an electrode E1 and an electrode E2 that face a cable CBL; a stabilization part 5 for connecting the electrode E1 to the ground via capacitors C1 and C2; an amplifying part A that amplifies voltage Vin obtained from the electrode E1 and that can change the amplification factor; a mode inputting part 81 that receives mode setting; a reference voltage outputting part PS that outputs a periodically changing reference voltage Vs; a measurement part 7 that measures output voltage Vout of the amplifying part A; a switch SW for connecting the electrode E2 to the ground in a measurement mode, and for connecting the electrode E2 to the reference voltage outputting part PS in a calibration mode; and a calibration processing part 82 that, when being in the calibration mode, adjusts an amplification factor G on the basis of a measurement magnification M, a reference voltage Vs, and a measurement value Vm of the measurement part 7 so that the output voltage Vout of the amplifying part A becomes equal to the measurement magnification M-times the amount of a cable voltage Vx.
Inventors:
KAWAGUCHI MASAHIRO (JP)
Application Number:
PCT/JP2022/005830
Publication Date:
August 18, 2022
Filing Date:
February 15, 2022
Export Citation:
Assignee:
NIDEC READ CORP (JP)
International Classes:
G01R15/06; G01R19/00
Foreign References:
| US5473244A | 1995-12-05 | |||
| US20190081601A1 | 2019-03-14 | |||
| JP2018105850A | 2018-07-05 | |||
| JP2017040526A | 2017-02-23 | |||
| JP2002340939A | 2002-11-27 |
Attorney, Agent or Firm:
ARAKAWA Satoshi et al. (JP)
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