GB350715A - Improvements relating to ohmmeters - Google Patents
Improvements relating to ohmmetersInfo
- Publication number
- GB350715A GB350715A GB1732930A GB1732930A GB350715A GB 350715 A GB350715 A GB 350715A GB 1732930 A GB1732930 A GB 1732930A GB 1732930 A GB1732930 A GB 1732930A GB 350715 A GB350715 A GB 350715A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- polepiece
- current coil
- horns
- approaches
- 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
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Particle Accelerators (AREA)
- Eye Examination Apparatus (AREA)
Abstract
350,715. Resistance measurements. EVERSHED & VIGNOLES, Ltd. and ROLFE, G. B., Acton Lane Works, Chiswick, London. June 4, 1930, No. 17329. [Class 37.] In a moving-coil ohmmeter for measuring high insulation resistances, the field magnet is provided with one or more polar extensions which repel the current coil as this approaches the zero position, thereby enabling the zero mark to be included on the scale with 'a comparatively low series resistance. As shown in Fig. 1, both sides of the current coil c and one side of the pressure coil P move in the gap between the polepieces R<1>, R<2> of the permanent magnet M and the fixed core K. A horn H extends from the lower polepiece R<2> so as to form a subsidiary polepiece F in the neighbourhood reached by the current coil c as the pointer X approaches the zero position. Interaction between this polepiece and the coil C produces a back torque which reduces the deflection from the infinity position. In a modification, Fig. 2, two horns H<1>, H2 are provided, the coils C, P being spaced apart axially so that the horns co-operate with the current coil only.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1732930A GB350715A (en) | 1930-06-04 | 1930-06-04 | Improvements relating to ohmmeters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1732930A GB350715A (en) | 1930-06-04 | 1930-06-04 | Improvements relating to ohmmeters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB350715A true GB350715A (en) | 1931-06-18 |
Family
ID=10093254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1732930A Expired GB350715A (en) | 1930-06-04 | 1930-06-04 | Improvements relating to ohmmeters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB350715A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9600968B2 (en) | 2004-08-19 | 2017-03-21 | Igt | Gaming system having multiple gaming machines which provide bonus awards |
-
1930
- 1930-06-04 GB GB1732930A patent/GB350715A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9600968B2 (en) | 2004-08-19 | 2017-03-21 | Igt | Gaming system having multiple gaming machines which provide bonus awards |
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