GB818482A - Improvements in earth resistance measuring equipment - Google Patents
Improvements in earth resistance measuring equipmentInfo
- Publication number
- GB818482A GB818482A GB468255A GB468255A GB818482A GB 818482 A GB818482 A GB 818482A GB 468255 A GB468255 A GB 468255A GB 468255 A GB468255 A GB 468255A GB 818482 A GB818482 A GB 818482A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- potentiometer
- earth
- electrodes
- circuit
- 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
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
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
818,482. Resistance measuring. EVER SHED & VIGNOLES Ltd. Feb. 8, 1956 [Feb. 16, 1955], No. 4682/55. Class 37. In apparatus for measuring earth resistance, in which the current supplied to an earth circuit is maintained at a predetermined ratio to the current in the resistance of a potentiometer, so that when the potentiometer output is balanced with the voltage drop across the portion of the earth circuit under test the resistance of the potentiometer up to balance point is directly proportional to, and is calibrated in terms of, the test resistance, a voltage is injected into the potentiometer circuit to compensate for natural earth potentials, and a device indicates when the test resistance is in circuit. As shown, the predetermined ratio between the current supplied to a vernier potentiometer P, which may be shunted by a resistor 16, and that fed to earthed electrodes Cl, C2 is obtained by adjusting resistors R1, R2, R3, R4. Any natural earth potential between electrodes P1, P2, which determine the test resistance, is balanced by the output of a potential divider 22 before the test resistance is connected to the potentiometer P. If battery B is initially connected to electrodes P1, P2, an indication is obtained on an instrument 26 when these electrodes are positioned in the earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB468255A GB818482A (en) | 1955-02-16 | 1955-02-16 | Improvements in earth resistance measuring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB468255A GB818482A (en) | 1955-02-16 | 1955-02-16 | Improvements in earth resistance measuring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB818482A true GB818482A (en) | 1959-08-19 |
Family
ID=9781800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB468255A Expired GB818482A (en) | 1955-02-16 | 1955-02-16 | Improvements in earth resistance measuring equipment |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB818482A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3205436A (en) * | 1962-02-02 | 1965-09-07 | Thomas M Donahue | Method and apparatus for measuring impedance increases in the ground or protective ground wires leading to three-wire prong power receptacles |
| RU205222U1 (en) * | 2020-11-25 | 2021-07-05 | Акционерное общество "Государственный космический научно-производственный центр им. М.В. Хруничева" | Relative resistance measuring device |
-
1955
- 1955-02-16 GB GB468255A patent/GB818482A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3205436A (en) * | 1962-02-02 | 1965-09-07 | Thomas M Donahue | Method and apparatus for measuring impedance increases in the ground or protective ground wires leading to three-wire prong power receptacles |
| RU205222U1 (en) * | 2020-11-25 | 2021-07-05 | Акционерное общество "Государственный космический научно-производственный центр им. М.В. Хруничева" | Relative resistance measuring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB818482A (en) | Improvements in earth resistance measuring equipment | |
| US3808521A (en) | Device including reference voltage and comparator means for measuring earth resistance | |
| GB939651A (en) | Device for ascertaining the blood-permeation conditions in the human or animal body | |
| US3056082A (en) | Electrical measuring instruments | |
| US2478742A (en) | Electric current meter | |
| GB1221072A (en) | Capacitive measurement of the level of material in a container | |
| GB1070081A (en) | Improvements in or relating to apparatus for the direct measurement of capacitance | |
| GB995922A (en) | A method of measuring resistivity and apparatus suitable for measuring resistivity | |
| GB1086749A (en) | Improvements in and relating to resistance testers | |
| GB861582A (en) | Improvements in compressed scale measuring instrument circuits | |
| GB887587A (en) | Improvements relating to electrical resistance measuring instruments | |
| GB1536390A (en) | Ohmmeters | |
| GB654675A (en) | Improvements in or relating to electrical devices for measuring small intervals of time | |
| SU112773A1 (en) | A device for measuring the ratio of two electrically determined values | |
| GB1384786A (en) | Electrical apparatus including means for automatically matching the apparatus to the internal resistance of a voltage supply | |
| SU603925A1 (en) | Arrangement for measuring characteristic currents and voltages of tunnel diodes | |
| SU143466A1 (en) | Device for measuring active resistances | |
| FR2316603A1 (en) | Measurement of moisture content of cereal grain - is effected by capacity meter employed as humidity meter | |
| GB817371A (en) | Improvements relating to nucleonic thickness gauges | |
| GB691862A (en) | Improvements in or relating to electrical measuring instruments | |
| GB1248534A (en) | Circuit for measuring transistor current gain | |
| GB1010498A (en) | Improvements in or relating to electric circuit arrangements for measuring uni-directional voltages | |
| GB602738A (en) | Improvements relating to electrical measuring instruments | |
| GB963374A (en) | Improvements relating to the measurement of earth resistance | |
| GB724888A (en) | Improvements in earth resistance measuring instruments |