GB610282A - Improvements in and relating to electrical resistance measuring apparatus - Google Patents

Improvements in and relating to electrical resistance measuring apparatus

Info

Publication number
GB610282A
GB610282A GB1043046A GB1043046A GB610282A GB 610282 A GB610282 A GB 610282A GB 1043046 A GB1043046 A GB 1043046A GB 1043046 A GB1043046 A GB 1043046A GB 610282 A GB610282 A GB 610282A
Authority
GB
United Kingdom
Prior art keywords
resistor
test
resistance
switch
bridge
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.)
Expired
Application number
GB1043046A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB1043046A priority Critical patent/GB610282A/en
Publication of GB610282A publication Critical patent/GB610282A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/10—AC or DC measuring bridges
    • G01R17/105—AC or DC measuring bridges for measuring impedance or resistance

Landscapes

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

Abstract

610,282. Resistance measurements. GENERAL ELECTRIC CO., Ltd., BARSDORF, L. W., and ORCHARD, F. C. April 4, 1946, No. 10430. [Class 37] A Wheatsone bridge has three resistors arranged in three arms, a check switch for connecting a known resistance in the fourth arm and a test switch for connecting in this arm test terminals between which the resistance to be tested can be connected. The bridge shown is particularly suitable for testing the resistance of earth continuity conductors of installation, including metal conduit, metalsheathed cable, &c., the resistance between any point of which and the earth electrode may not exceed 1 ohm. Three resistors 1, 2, 3 of 0.6 ohms, each are connected in three arms of a Wheatstone bridge, a galvanometer 4 being connected in diagonal A, B and a battery 5 being connected across the diagonal C, D through the contacts 6 of a push-button check switch 7 or the contacts 9 of a push-button test switch 8. A resistor 12 of 1.5 ohms is connected between points A, C and test clips 16 are connected by leads 15 and terminals 13, 14 to points A, E. A standard resistor 11 of 1 ohm is connected between the points E, C. The check switch 7 is closed and the test clips 16 are connected together, whereby the resistor 11 in series with the test leads 15 is connected in parallel with the resistor 12. All four arms have then the same resistance and the bridge should be balanced. The check switch 7 is opened, the test clips 16 are connected to the resistor under test, and the test switch 8 is closed. The standard resistance 11 is thereby short circuited through the switch contacts 9, 10 and the resistor under test is connected in parallel with the resistor 12. If the resistor under test has the same value as the standard resistor 11 the bridge is balanced. Deflection of the galvanometer 4 indicates a value above or below the standard. A trimming resistor 17 may be connected between the resistors 1, 12 by which the bridge may be adjusted to compensate for unbalance due to the resistance of the leads 15 &c.
GB1043046A 1946-04-04 1946-04-04 Improvements in and relating to electrical resistance measuring apparatus Expired GB610282A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1043046A GB610282A (en) 1946-04-04 1946-04-04 Improvements in and relating to electrical resistance measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1043046A GB610282A (en) 1946-04-04 1946-04-04 Improvements in and relating to electrical resistance measuring apparatus

Publications (1)

Publication Number Publication Date
GB610282A true GB610282A (en) 1948-10-13

Family

ID=9967684

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1043046A Expired GB610282A (en) 1946-04-04 1946-04-04 Improvements in and relating to electrical resistance measuring apparatus

Country Status (1)

Country Link
GB (1) GB610282A (en)

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