JPS5745468A - Pointer type resistance meter for electric blasting - Google Patents

Pointer type resistance meter for electric blasting

Info

Publication number
JPS5745468A
JPS5745468A JP12122880A JP12122880A JPS5745468A JP S5745468 A JPS5745468 A JP S5745468A JP 12122880 A JP12122880 A JP 12122880A JP 12122880 A JP12122880 A JP 12122880A JP S5745468 A JPS5745468 A JP S5745468A
Authority
JP
Japan
Prior art keywords
resistances
voltmeter
pointer type
resistance
operational amplifier
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
JP12122880A
Other languages
Japanese (ja)
Inventor
Eiichi Fujiyama
Masachika Hirayama
Ichiro Amari
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.)
NIKKA SEIKA KK
Nippon Kayaku Co Ltd
Original Assignee
NIKKA SEIKA KK
Nippon Kayaku 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 NIKKA SEIKA KK, Nippon Kayaku Co Ltd filed Critical NIKKA SEIKA KK
Priority to JP12122880A priority Critical patent/JPS5745468A/en
Publication of JPS5745468A publication Critical patent/JPS5745468A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE:To measure the resistance value of a blasting circuit accurately by an ordinary voltmeter, only by flowing a fine current to the blasting circuit while using an operational amplifier. CONSTITUTION:An R1 and an R1', and an R0 and an R0' are resistances having an equal resistance value in couples, an Rv is a variable resistance, and an Rx is a resistance to be measured. Between the free terminal of the R0' and a terminal T2, a pointer type voltmeter M is inserted to compose a closed circuit of the resistances and voltmeter M. The connection point between the resistances R1 and R2 is connected to the addition point 2 of an operational amplifier A, and that between the resistances R1' and R0' is connected to the reference point 3 of the operational amplifier A. The output point 6 of the amplifier A is connected between the voltmeter M and terminal T2. Then, if the voltage of the voltmeter M is l0 and the power voltage (l), l0=-(Rx/2R0)l, so that value of the resistances Rx is found. When the (l) is 3v, and R0 and R1 are about 1.5kOMEGA respectively, resistance values between about 1 and 100OMEGA are measured with <=1mA currents.
JP12122880A 1980-09-03 1980-09-03 Pointer type resistance meter for electric blasting Pending JPS5745468A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12122880A JPS5745468A (en) 1980-09-03 1980-09-03 Pointer type resistance meter for electric blasting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12122880A JPS5745468A (en) 1980-09-03 1980-09-03 Pointer type resistance meter for electric blasting

Publications (1)

Publication Number Publication Date
JPS5745468A true JPS5745468A (en) 1982-03-15

Family

ID=14806063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12122880A Pending JPS5745468A (en) 1980-09-03 1980-09-03 Pointer type resistance meter for electric blasting

Country Status (1)

Country Link
JP (1) JPS5745468A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058694A (en) * 1989-05-22 1991-10-22 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Reservoir tank support structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058694A (en) * 1989-05-22 1991-10-22 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Reservoir tank support structure

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