GB1258056A - - Google Patents
Info
- Publication number
- GB1258056A GB1258056A GB1258056DA GB1258056A GB 1258056 A GB1258056 A GB 1258056A GB 1258056D A GB1258056D A GB 1258056DA GB 1258056 A GB1258056 A GB 1258056A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- digital
- counter
- resetting
- effected
- 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)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
1,258,056. Frequency measuring. ENGLISH ELECTRIC CO. Ltd. 27 June, 1969 [1 July, 1968], No. 31287/68. Heading H3A. [Also in Division G4] Negative going zero-crossovers of a signal (a) Fig. 2, whose frequency is to be measured cause (i) a pulse 7, Fig. 1, (c) Fig. 2, to close a gate 12 and to sample SW14 the output of a digital-toanalogue converter SW1,...SW13, R, R1,... R13, and (ii) a pulse 8, Fig. 1, (d) Fig. 2, to reset a binary counter 11 so that counting of clockpulses 10 can take place until the next negative going zero-crossover occurs in the input signal. The digital-to-analogue converter receives a constant current 14 and is so arranged that its output voltage to an amplifier 15, (g) Fig. 2, is at a maximum when the counter is empty, so that its output represents frequency and not period. Compensation for the period (c) Fig. 2, during which the output is sampled and resetting is effected-during which in theory counting should be taking place-is effected by resetting the counter to small count rather than zero, or by adding a resistor R to the digital-to-analogue converter.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3128768 | 1968-07-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1258056A true GB1258056A (en) | 1971-12-22 |
Family
ID=10320888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1258056D Expired GB1258056A (en) | 1968-07-01 | 1968-07-01 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1258056A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2317662A1 (en) * | 1975-07-09 | 1977-02-04 | Facom | Frequency measurement circuit for tachometers - comprises clock, counter, digital-to-analogue converter, control circuit and display |
| FR2458815A1 (en) * | 1979-06-12 | 1981-01-02 | Alsthom Atlantique | Pulse train frequency digital measuring system - uses clock pulse generator with specified frequency, counts generator pulses and derives frequency by inversion |
-
1968
- 1968-07-01 GB GB1258056D patent/GB1258056A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2317662A1 (en) * | 1975-07-09 | 1977-02-04 | Facom | Frequency measurement circuit for tachometers - comprises clock, counter, digital-to-analogue converter, control circuit and display |
| FR2458815A1 (en) * | 1979-06-12 | 1981-01-02 | Alsthom Atlantique | Pulse train frequency digital measuring system - uses clock pulse generator with specified frequency, counts generator pulses and derives frequency by inversion |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |