JPS5774670A - Tester for construction work - Google Patents

Tester for construction work

Info

Publication number
JPS5774670A
JPS5774670A JP55151276A JP15127680A JPS5774670A JP S5774670 A JPS5774670 A JP S5774670A JP 55151276 A JP55151276 A JP 55151276A JP 15127680 A JP15127680 A JP 15127680A JP S5774670 A JPS5774670 A JP S5774670A
Authority
JP
Japan
Prior art keywords
phase
different
same
signals
tester
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.)
Granted
Application number
JP55151276A
Other languages
Japanese (ja)
Other versions
JPS644630B2 (en
Inventor
Takehiko Naito
Masayuki Ota
Norifumi Hotta
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.)
Nippon Kouatsu Electric Co
Tokyo Electric Power Company Holdings Inc
Original Assignee
Nippon Kouatsu Electric Co
Tokyo Electric Power Co Inc
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 Nippon Kouatsu Electric Co, Tokyo Electric Power Co Inc filed Critical Nippon Kouatsu Electric Co
Priority to JP55151276A priority Critical patent/JPS5774670A/en
Publication of JPS5774670A publication Critical patent/JPS5774670A/en
Publication of JPS644630B2 publication Critical patent/JPS644630B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/18—Indicating phase sequence; Indicating synchronism

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

PURPOSE:To obtain a phase-detecting tester to be used in construction sites, by conducting limit process of an input from a different measuring section at the identically low level, discriminating between different phase and same phase through a differential amplifier and indicating the result. CONSTITUTION:High voltage inputs from different measuring sections are converted to identically and extremely low level signals by limiter circuits 2 and 2', respectively, and they are compared with each other by a differential amplifier 3, and when they are of the same phase, the amplifier 3 makes no output, and it makes output only when they are of different phases. Even in case when there is a remarkable difference between these signals, the signals are converted to the same level, discriminated under the same condition and indicated on an indicator 5 as the same phase or different phase, and by using such a system as this, it is possible to obtain a highly reliable phase-detecting tester designed for being used in construction sites.
JP55151276A 1980-10-28 1980-10-28 Tester for construction work Granted JPS5774670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55151276A JPS5774670A (en) 1980-10-28 1980-10-28 Tester for construction work

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55151276A JPS5774670A (en) 1980-10-28 1980-10-28 Tester for construction work

Publications (2)

Publication Number Publication Date
JPS5774670A true JPS5774670A (en) 1982-05-10
JPS644630B2 JPS644630B2 (en) 1989-01-26

Family

ID=15515133

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55151276A Granted JPS5774670A (en) 1980-10-28 1980-10-28 Tester for construction work

Country Status (1)

Country Link
JP (1) JPS5774670A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60168074U (en) * 1984-04-16 1985-11-07 関西計器工業株式会社 Electric field type phase detector
JPH054042U (en) * 1991-06-26 1993-01-22 株式会社トーエネツク Phase detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60168074U (en) * 1984-04-16 1985-11-07 関西計器工業株式会社 Electric field type phase detector
JPH054042U (en) * 1991-06-26 1993-01-22 株式会社トーエネツク Phase detector

Also Published As

Publication number Publication date
JPS644630B2 (en) 1989-01-26

Similar Documents

Publication Publication Date Title
ES477892A1 (en) Ground distance relay employing phase comparator measurement
JPS57190251A (en) Absorbance system analyzer
JPS5774670A (en) Tester for construction work
SU1182418A2 (en) Voltage converter
US3537018A (en) Phase sensitive detector
JPS54143274A (en) Frequency analyzer
JPS56160611A (en) Analog quantity indicator
JPS57111420A (en) Correlation meter
SU1406519A1 (en) Input resistance active component transducer
SU1413552A1 (en) Device for automatic measurement of inductance of magnetic heads
JPS5554478A (en) Comparing test method
SU596886A1 (en) Method of amplitude-comparison of two harmonic voltages
SU794449A1 (en) Structurescope
JPS55154470A (en) Level detecting system
JPS55163460A (en) Fluctuation indicator
JPS55121119A (en) Load gauge for vehicle
JPS56120961A (en) Measuring method for central frequency for narrow-band irregular signal
JPS5552607A (en) Fm detector circuit
JPS55110444A (en) Failure detection circuit
JPS6465485A (en) Metal detector
JPS54150657A (en) Detecting trouble of induction motor
Brink A Simplified Integral Test for the Convergence of Infinite Series
Mourlam Jr et al. LOCK-IN DETECTOR.
JPS5648371A (en) Reel cable winding defect detection system
JPS54122182A (en) Reflection type photo electric detector