Measurement of Nano-Voltages using Pre-Amplifier with Magnetic Shield
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- Azuma Hideki
- Kyushu Institute of Technology
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- Harada Nariaki
- Tabuse Technical High School
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- Sonoda Toshikatsu
- Kyushu Institute of Technology
Bibliographic Information
- Other Title
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- 磁気シールドを施した前置増幅器を用いた微小電圧計測
- ジキ シールド オ ホドコシタ ゼンチ ゾウフクキ オ モチイタ ビショウ デ
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Abstract
For measurement of nano-voltages it is required to evaluate the noise which comes from a Zener diode and a lithium battery which will be used here.<br>This paper discusses the problems which arise when a commercial digital multimeter (D.M.M.) which has nominally resolution of 10nV is used for some measurement. That is, the magnetic fields in a usual test room which is 10-9 to 10-7 T with 60Hz and also the magnetic field which is 10-7 T and comes from the power supply part of the D.M.M. through the transformer will disturb nano-volt measurement. These magnetic fields possibly induce a 10nV in the measurement circuit of the D.M.M. This fact recommends the magnetic shielding of the measurement circuit. Moreover the D.M.M. shows 10∼20μV when the input terminals are short circuited. This fact is very a serious problem for measurement of nano-volt. We observed that linearity is not hold lower than 800nV using a single frequency sinusoidal voltage input.<br>In order to resolve the problems mentioned above, a measured voltage is pre-amplified by a low-noise amplifier with magnetic shielding before it is input to the D.M.M. As a result, the lowest linearity improved from 800nV to 10nV is obtained.
Journal
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- IEEJ Transactions on Electronics, Information and Systems
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IEEJ Transactions on Electronics, Information and Systems 118 (11), 1663-1669, 1998
The Institute of Electrical Engineers of Japan
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Details 詳細情報について
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- CRID
- 1390282679583747968
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- NII Article ID
- 130006843003
- 10002815558
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- NII Book ID
- AN10065950
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- ISSN
- 13488155
- 03854221
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- NDL BIB ID
- 4588431
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed