GB1080877A - Improvements in and relating to frequency measuring apparatus - Google Patents
Improvements in and relating to frequency measuring apparatusInfo
- Publication number
- GB1080877A GB1080877A GB4260463A GB4260463A GB1080877A GB 1080877 A GB1080877 A GB 1080877A GB 4260463 A GB4260463 A GB 4260463A GB 4260463 A GB4260463 A GB 4260463A GB 1080877 A GB1080877 A GB 1080877A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- counter
- oscillators
- measuring apparatus
- oscillator
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
1,080,877. Electric selective signalling. ADVANCE ELECTRONICS Ltd. Oct. 16, 1964 [Oct. 29, 1963], No. 42604/63. Heading G4H. In a frequency measuring apparatus the unknown input is mixed, at 13, 14 with the nth harmonics from two oscillators 10, 11 to yield I.F.'s which are (amplified at 15, 16 and phase compared 17, 18 with a standard frequency, derived from a generator in counter 12, to give outputs which control the phase locking of the associated oscillators 10, 11 and are also connected alternately to a phase lock indicator 19. The output of oscillator 10 tuned to the lower locked frequency is applied to the counter 12 and the outputs of the oscillators 10, 11 are applied to a mixer 21 and frequency halver 22 to providea further input <SP>10</SP>/ n tothe counter 12 which extends its counting time to count the fundamental frequency of oscillator 10. In order to register a correct count of the input signal a spurious pulse is generated by the counter 12 and added to its tens stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4260463A GB1080877A (en) | 1963-10-29 | 1963-10-29 | Improvements in and relating to frequency measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4260463A GB1080877A (en) | 1963-10-29 | 1963-10-29 | Improvements in and relating to frequency measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1080877A true GB1080877A (en) | 1967-08-23 |
Family
ID=10425168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4260463A Expired GB1080877A (en) | 1963-10-29 | 1963-10-29 | Improvements in and relating to frequency measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1080877A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3753118A (en) * | 1970-07-22 | 1973-08-14 | Siemens Ag | Circuit for determining the frequency assigned to a markable instant of a frequency-modulated transmitter |
| US3781678A (en) * | 1973-02-14 | 1973-12-25 | Systron Donner Corp | Automatic transfer oscillator with improved fm tolerance |
-
1963
- 1963-10-29 GB GB4260463A patent/GB1080877A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3753118A (en) * | 1970-07-22 | 1973-08-14 | Siemens Ag | Circuit for determining the frequency assigned to a markable instant of a frequency-modulated transmitter |
| US3781678A (en) * | 1973-02-14 | 1973-12-25 | Systron Donner Corp | Automatic transfer oscillator with improved fm tolerance |
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