書誌事項
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- Measurement of Nano-Voltages using Pre-Amplifier with Magnetic Shield
- 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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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.
収録刊行物
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- 電気学会論文誌C(電子・情報・システム部門誌)
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電気学会論文誌C(電子・情報・システム部門誌) 118 (11), 1663-1669, 1998
一般社団法人 電気学会
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詳細情報 詳細情報について
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- CRID
- 1390282679583747968
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- NII論文ID
- 130006843003
- 10002815558
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- NII書誌ID
- AN10065950
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- ISSN
- 13488155
- 03854221
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- NDL書誌ID
- 4588431
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