GB1075096A - Frequency measuring apparatus - Google Patents
Frequency measuring apparatusInfo
- Publication number
- GB1075096A GB1075096A GB986966A GB986966A GB1075096A GB 1075096 A GB1075096 A GB 1075096A GB 986966 A GB986966 A GB 986966A GB 986966 A GB986966 A GB 986966A GB 1075096 A GB1075096 A GB 1075096A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- counter
- output
- switch
- measured
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
-
- 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
-
- 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
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
1,075,096. Measuring frequency. AGA A.B. March 7, 1966 [April 9, 1965], No. 9869/66. Heading G4H. The frequency of an alternating voltage is measured by apparatus comprising a frequency doubler (2, Fig. 1, not shown), a frequency dividing electronic counter (6), switching means (3, 4, 5) to apply either the frequency to be measured or the doubled frequency to the counter (6), the switching means being set by the output signal from the counter, a reference frequency generator (7), a frequency comparator (8) receiving the reference frequency and the output from the counter (6), a counter (13) driven one way or the other according to the relative frequency values of the inputs to the comparator (8) and a coincidence detector (14) which, when the counts in the two counters are the same, switches the switching means to the other setting. In operation the frequency f to be measured is first applied to the counter (6). When the count in this counter equals that in counter (13) the first switch (3) closes and the second switch (4) opens so that a frequency of 2f is applied to the counter (6) until it reaches its full capacity. The switch (3) then re-opens and the cycle repeats. The output from the divider is compared for frequency with the reference frequency. The comparator output adjusts the counter (13) until a balance is achieved and the value in this counter can then be used to determine the frequency f. A circuit working on principles similar to those described above may be provided to enable one of a number of different reference frequencies to be selected.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE460865A SE317128B (en) | 1965-04-09 | 1965-04-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1075096A true GB1075096A (en) | 1967-07-12 |
Family
ID=20264574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB986966A Expired GB1075096A (en) | 1965-04-09 | 1966-03-07 | Frequency measuring apparatus |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE1516066A1 (en) |
GB (1) | GB1075096A (en) |
SE (1) | SE317128B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1616101A1 (en) | 1967-06-15 | 1977-04-14 | Wandel & Goltermann | SELECTIVE MEASURING DEVICE FOR LEVEL AND/OR PHASE DIFFERENTIAL AND/OR ABSOLUTE LEVEL MEASUREMENT |
DE2413603C2 (en) * | 1974-03-21 | 1986-01-16 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | Circuit arrangement for recognizing frequencies |
US4438405A (en) * | 1980-08-12 | 1984-03-20 | Nippon Gijutsu Boeki Co., Ltd. | Frequency discriminating device |
-
1965
- 1965-04-09 SE SE460865A patent/SE317128B/xx unknown
-
1966
- 1966-03-07 GB GB986966A patent/GB1075096A/en not_active Expired
- 1966-03-31 DE DE19661516066 patent/DE1516066A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
SE317128B (en) | 1969-11-10 |
DE1516066A1 (en) | 1969-09-25 |
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