GB450864A - Improvements in electrical measuring and/or signalling systems - Google Patents
Improvements in electrical measuring and/or signalling systemsInfo
- Publication number
- GB450864A GB450864A GB238535A GB238535A GB450864A GB 450864 A GB450864 A GB 450864A GB 238535 A GB238535 A GB 238535A GB 238535 A GB238535 A GB 238535A GB 450864 A GB450864 A GB 450864A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- motor generator
- frequency
- measured
- speed
- 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
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
450,864. Frequency measurements. AUTOMATIC ELECTRIC CO., Ltd., Strowger Works, Liverpool, and RAYNER, T. R., 2, Stretton Avenue, Wallasey, Cheshire. Jan. 24, 1935, No. 2835. [Class 37] [See also Group XXXVIII] Frequency measurements are effected by comparing the output of a synchronous motor generator driven at a speed corresponding to the frequency to be measured with the output of a second motor generator run at a known speed. As shown, the current of the frequency to be measured operates a synchronous motor generator S1, DI through an amplifier demodulator D, the output of the generator D1 being connected in opposition through a central-zero instrument G to the output of a motor generator S2, D2 driven at known speed by an oscillator under the control of a tuning-fork TF. Several measurements may be effected simultaneously over the same circuit by utilizing carrier currents of different frequencies modulated by the currents to be measured. When the system is arranged to give a number of indications a single standard speed motor drives a number of generators or a number of separate motor generators are provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB238535A GB450864A (en) | 1935-01-24 | 1935-01-24 | Improvements in electrical measuring and/or signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB238535A GB450864A (en) | 1935-01-24 | 1935-01-24 | Improvements in electrical measuring and/or signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB450864A true GB450864A (en) | 1936-07-24 |
Family
ID=9738611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB238535A Expired GB450864A (en) | 1935-01-24 | 1935-01-24 | Improvements in electrical measuring and/or signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB450864A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2425613A (en) * | 1941-06-28 | 1947-08-12 | Borg George W Corp | Timing apparatus |
-
1935
- 1935-01-24 GB GB238535A patent/GB450864A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2425613A (en) * | 1941-06-28 | 1947-08-12 | Borg George W Corp | Timing apparatus |
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