GB688995A - Improvements relating to electrical measuring instruments - Google Patents
Improvements relating to electrical measuring instrumentsInfo
- Publication number
- GB688995A GB688995A GB3125550A GB3125550A GB688995A GB 688995 A GB688995 A GB 688995A GB 3125550 A GB3125550 A GB 3125550A GB 3125550 A GB3125550 A GB 3125550A GB 688995 A GB688995 A GB 688995A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- electrodes
- dec
- transformer
- measuring instruments
- 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
688,995. Resistance measurement. EVERSHED & VIGNOLES, Ltd. Dec. 20, 1951 [Dec. 22, 1950], No. 31255/50. Class 37. To measure earth resistance between electrodes P1, P2, A.C. is supplied over the primary 3 of transformer 4 to electrodes C1, C2, and its secondary feeds a variable resistance 7, the A.C. across which is opposed to that developed between electrodes PI, P2; resistance 7 is adjusted until the meter 6 reads zero, the relationship between X, the unknown resistance, and 7 then depending on the ratio of the transformer. Preferably, the A.C. is derived from a hand generator 1, and the meter fed over a mechanical rectifier 11 driven in step with the generator. The primary winding 3 is preferably tapped to provide several ratios. The circuit has the advantage that the resistance C, D of the electrodes P1, P2 is eliminated from the result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3125550A GB688995A (en) | 1950-12-22 | 1950-12-22 | Improvements relating to electrical measuring instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3125550A GB688995A (en) | 1950-12-22 | 1950-12-22 | Improvements relating to electrical measuring instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB688995A true GB688995A (en) | 1953-03-18 |
Family
ID=10320357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3125550A Expired GB688995A (en) | 1950-12-22 | 1950-12-22 | Improvements relating to electrical measuring instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB688995A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2132357A (en) * | 1982-12-17 | 1984-07-04 | Standard Telephones Cables Ltd | Buried object location |
-
1950
- 1950-12-22 GB GB3125550A patent/GB688995A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2132357A (en) * | 1982-12-17 | 1984-07-04 | Standard Telephones Cables Ltd | Buried object location |
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