GB1002738A - Improvements in or relating to devices, in particular safety devices, responsive to pulses - Google Patents
Improvements in or relating to devices, in particular safety devices, responsive to pulsesInfo
- Publication number
- GB1002738A GB1002738A GB2146962A GB2146962A GB1002738A GB 1002738 A GB1002738 A GB 1002738A GB 2146962 A GB2146962 A GB 2146962A GB 2146962 A GB2146962 A GB 2146962A GB 1002738 A GB1002738 A GB 1002738A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- curve
- capacitor
- pulse input
- level
- 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
- G01R23/06—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage
- G01R23/09—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage using analogue integrators, e.g. capacitors establishing a mean value by balance of input signals and defined discharge signals or leakage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
1,002,738. Frequency detectors. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. June 4, 1962 [June 7, 1961], No. 21469/62. Heading H3A. A safety circuit responsive to the frequency of input pulses at V 1 comprises (a) a diode-pump C 1 , D 1 , D 2 , C 3 which tends to charge capacitor C 3 to a negative voltage (curve 2, Fig. 2) substantially proportional to the pulse input frequency n, and (b) a diode pump C 2 , D 3 , D 4 , C 4 which tends to charge the capacitor C 3 over resistor R 1 in the opposite sense to a voltage (curve 1, Fig. 2) which is substantially constant from a very low value of pulse input frequency. The resultant output voltage V 2 (curve 3) across capacitor 3, causes a switching operation when its level exceeds a level shown at 4 i.e. when the pulse input frequency n exceeds a predetermined value P but is less than a larger predetermined value Q. An alarm is given when the output voltage is below the level 4 i.e. when n < P or when n > Q. The device may be used to indicate excessive radio-active radiation, in a liquid level indicator using a radio-active isotope or in a safety device against excessive speed of a motor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL265683 | 1961-06-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1002738A true GB1002738A (en) | 1965-08-25 |
Family
ID=19753080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2146962A Expired GB1002738A (en) | 1961-06-07 | 1962-06-04 | Improvements in or relating to devices, in particular safety devices, responsive to pulses |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1002738A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0051906A2 (en) * | 1980-11-06 | 1982-05-19 | British Gas Corporation | Fuel burner control system circuit |
-
1962
- 1962-06-04 GB GB2146962A patent/GB1002738A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0051906A2 (en) * | 1980-11-06 | 1982-05-19 | British Gas Corporation | Fuel burner control system circuit |
| EP0051906A3 (en) * | 1980-11-06 | 1983-02-09 | British Gas Corporation | Fuel burner control system circuit |
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