JPS61129578A - Measuring instrument for fine current - Google Patents

Measuring instrument for fine current

Info

Publication number
JPS61129578A
JPS61129578A JP59250638A JP25063884A JPS61129578A JP S61129578 A JPS61129578 A JP S61129578A JP 59250638 A JP59250638 A JP 59250638A JP 25063884 A JP25063884 A JP 25063884A JP S61129578 A JPS61129578 A JP S61129578A
Authority
JP
Japan
Prior art keywords
amplifier
output
power source
logarithmic
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP59250638A
Other languages
Japanese (ja)
Inventor
Kiyohito Yamamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP59250638A priority Critical patent/JPS61129578A/en
Publication of JPS61129578A publication Critical patent/JPS61129578A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To measure the amount of a current from an extremely low level to a high level with one range by performing linear amplifying operation in a fine current area and logarithmic amplifying operation in an area above it.
CONSTITUTION: When an input current I0 is small and the output voltage of an amplifier 3 is lower than the voltage of a power source 22, an amplifier 3 performs linear output operation. At this time, the output of an amplifier 33 is made ineffective through a contact b4. On the other hand, when the current I0 increases and the output voltage of the amplifier 3 rises above the voltage of the power source 22, a switching circuit 6 operates and then while the amplifier 3 enters the logarithmic output operation, the output of the amplifier 33 is supplied to the input of an amplifier 34. Further, the output of a power source 21 is made lower than that of the power source 22 to prevent hunting. The output value right before the amplifier 3 in linear output operation enters logarithmic output operation is made nearly equal to the output value after the amplifier enters the logarithmic output operation to standardize a measurement scale.
COPYRIGHT: (C)1986,JPO&Japio
JP59250638A 1984-11-29 1984-11-29 Measuring instrument for fine current Pending JPS61129578A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59250638A JPS61129578A (en) 1984-11-29 1984-11-29 Measuring instrument for fine current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59250638A JPS61129578A (en) 1984-11-29 1984-11-29 Measuring instrument for fine current

Publications (1)

Publication Number Publication Date
JPS61129578A true JPS61129578A (en) 1986-06-17

Family

ID=17210831

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59250638A Pending JPS61129578A (en) 1984-11-29 1984-11-29 Measuring instrument for fine current

Country Status (1)

Country Link
JP (1) JPS61129578A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011224103A (en) * 2010-04-19 2011-11-10 Atsuyuki Yoshioka Pinch-to-open stirring spoon with clip

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011224103A (en) * 2010-04-19 2011-11-10 Atsuyuki Yoshioka Pinch-to-open stirring spoon with clip

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