GB770035A - Improvements in or relating to apparatus for the evaluation of low frequencies - Google Patents
Improvements in or relating to apparatus for the evaluation of low frequenciesInfo
- Publication number
- GB770035A GB770035A GB1030256A GB1030256A GB770035A GB 770035 A GB770035 A GB 770035A GB 1030256 A GB1030256 A GB 1030256A GB 1030256 A GB1030256 A GB 1030256A GB 770035 A GB770035 A GB 770035A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dividing
- counter
- phenomenon
- period
- frequency
- 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
- G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
- G04F10/04—Apparatus for measuring unknown time intervals by electric means by counting pulses or half-cycles of an ac
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
770,035. Frequency measurement. CINEMATELEVISION, Ltd. Jan. 11, 1955 [Jan. 13, 1954], No. 10302/56. Divided out of 770,034, [Group XIX]. Class 37. Apparatus for determining the frequency of a periodic phenomenon of very low frequency comprises means responsive to the phenomenon for allowing electrical signals of a known repetition rate to pass to a counter for a period equal to one cycle of the phenomenon, and electrical means for dividing the number registered by the counter at the end of the period into unity. A shaper circuit 7 develops a pulse of duration equal to one cycle of the signal entered at terminal 6 and opens a gate 8 for this period to allow clock pulses from a source 9 to pass to a counter 10. The required frequency is given by the reciprocal of this number which is obtained by dividing it into unity. The dividing means which, preferably. comprises multicathode counting tubes, is described in Specification 770,034, [Group XIX]. Transfer of the number to the dividing means 1 ... 5 may be performed by uniselector switches or coincidence circuits.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1030256A GB770035A (en) | 1954-01-13 | 1954-01-13 | Improvements in or relating to apparatus for the evaluation of low frequencies |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1030256A GB770035A (en) | 1954-01-13 | 1954-01-13 | Improvements in or relating to apparatus for the evaluation of low frequencies |
Publications (1)
Publication Number | Publication Date |
---|---|
GB770035A true GB770035A (en) | 1957-03-13 |
Family
ID=9965360
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1030256A Expired GB770035A (en) | 1954-01-13 | 1954-01-13 | Improvements in or relating to apparatus for the evaluation of low frequencies |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB770035A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2986699A (en) * | 1958-10-27 | 1961-05-30 | Itt | Prf counter |
US3079554A (en) * | 1959-11-17 | 1963-02-26 | Singer Mfg Co | Mark generator |
FR2210048A1 (en) * | 1972-12-11 | 1974-07-05 | Ford France | |
DE3108848A1 (en) * | 1980-03-10 | 1982-01-14 | Imed Corp., 92131 San Diego, Calif. | DROP METER |
-
1954
- 1954-01-13 GB GB1030256A patent/GB770035A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2986699A (en) * | 1958-10-27 | 1961-05-30 | Itt | Prf counter |
US3079554A (en) * | 1959-11-17 | 1963-02-26 | Singer Mfg Co | Mark generator |
FR2210048A1 (en) * | 1972-12-11 | 1974-07-05 | Ford France | |
DE3108848A1 (en) * | 1980-03-10 | 1982-01-14 | Imed Corp., 92131 San Diego, Calif. | DROP METER |
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