GB1427694A - Circuits for use in monitoring limit values of electrical signals - Google Patents
Circuits for use in monitoring limit values of electrical signalsInfo
- Publication number
- GB1427694A GB1427694A GB1876074A GB1876074A GB1427694A GB 1427694 A GB1427694 A GB 1427694A GB 1876074 A GB1876074 A GB 1876074A GB 1876074 A GB1876074 A GB 1876074A GB 1427694 A GB1427694 A GB 1427694A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sinewave
- space
- zero
- frequency
- mark
- 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
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/1659—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 to indicate that the value is within or outside a predetermined range of values (window)
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
1427694 Frequency detection SHARETREE Ltd 29 April 1974 18760/74 Heading H3A [Also in Division G1] Positive going zero-crossovers of an applied sinewave A, Fig. 3c, are detected 23, applied to a switching circuit 26, 29, 30 which produces a rectangular pulse train extending from - 5 v. to +5 v. and having a constant "mark" of 10-2 ms. (=half the cycle time of a 49 c./s. wave) and a "space" which varies linear with the frequency of the applied sinewave A (the duration of the space being 10À2 ms. when the applied sinewave has a frequency of 49 c./s. and zero when it is 98 c./s.), and the mark/space significant rectangular pulse train is averaged 32 to give an output voltage which varies about zero as the input frequency varies about 49 c./s. Each positive going zero-crossover in the input sinewave A momentarily turns on a transistor 26 to discharge a capacitor 27 which then charges towards - 5 v. via a resistor 28 adjusted so that the bottom plate of the capacitor 27 reaches Ov after 10À2 ms. Thus, the circuit 29, 30, 31 produces a +5 v. "mark" of a fixed duration of 10À2 ms. and a space of - 5 v. which extends until the next positive going zero-crossover occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1876074A GB1427694A (en) | 1974-04-29 | 1974-04-29 | Circuits for use in monitoring limit values of electrical signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1876074A GB1427694A (en) | 1974-04-29 | 1974-04-29 | Circuits for use in monitoring limit values of electrical signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1427694A true GB1427694A (en) | 1976-03-10 |
Family
ID=10117936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1876074A Expired GB1427694A (en) | 1974-04-29 | 1974-04-29 | Circuits for use in monitoring limit values of electrical signals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1427694A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2128344A (en) * | 1982-09-30 | 1984-04-26 | Ford Motor Co | Voltage sensor device |
| GB2218217A (en) * | 1988-05-02 | 1989-11-08 | Mitel Corp | Voltage monitor for in-circuit testing |
-
1974
- 1974-04-29 GB GB1876074A patent/GB1427694A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2128344A (en) * | 1982-09-30 | 1984-04-26 | Ford Motor Co | Voltage sensor device |
| US4634971A (en) * | 1982-09-30 | 1987-01-06 | Ford Motor Company | Portable hand-held voltage sensor with manually adjustable reference voltage for comparison with sensed voltage |
| GB2218217A (en) * | 1988-05-02 | 1989-11-08 | Mitel Corp | Voltage monitor for in-circuit testing |
| GB2218217B (en) * | 1988-05-02 | 1992-08-19 | Mitel Corp | Voltage monitor for in-circuit testing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |