GB660521A - Improvements in circuit-arrangements for use in automatic signalling systems for testing a voltage or a resistance in an outlet of a switch - Google Patents
Improvements in circuit-arrangements for use in automatic signalling systems for testing a voltage or a resistance in an outlet of a switchInfo
- Publication number
- GB660521A GB660521A GB23375/49A GB2337549A GB660521A GB 660521 A GB660521 A GB 660521A GB 23375/49 A GB23375/49 A GB 23375/49A GB 2337549 A GB2337549 A GB 2337549A GB 660521 A GB660521 A GB 660521A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- condenser
- test
- voltage
- resistance
- 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
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
660,521. Electric control systems. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Sept. 9, 1949. [Sept 13, 1948] No. 33376/49. Class 40 (i). [Also in Group XXXIX] In a system in which tests are made over a wiper of a switch to determine the voltage or resistance connected to a co-operating terminal, a current due to a condenser charge or discharge is caused to flow across the point of contact prior to the making of the test. This current which is higher than that used in making the test is used to break down the resistance due to the formation of oxides on the contacts. In the embodiment shown in Fig. 1 in which the device 17 is operated to stop the switch KS when the potential encountered in its bank is equal to that connected up by a numerically set switch MS the condenser 18 produces the necessary discharge current when the wiper passes (e.g.) from terminal 10 to the adjacent terminal 11 having a different potential. The effect may be enhanced by additional condensers 19. Fig. 2 illustrates a circuit for determining the potential connected to an outlet on which the switch EK has been stopped by means unspecified. When the test is to be made contact 25 connects up the voltage comparison device SO and condenser 22 discharges into condenser 24 over the wipers of the intervening switches.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL660521X | 1948-09-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB660521A true GB660521A (en) | 1951-11-07 |
Family
ID=19796331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23375/49A Expired GB660521A (en) | 1948-09-13 | 1949-09-09 | Improvements in circuit-arrangements for use in automatic signalling systems for testing a voltage or a resistance in an outlet of a switch |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE807955C (en) |
| FR (1) | FR995224A (en) |
| GB (1) | GB660521A (en) |
| NL (2) | NL142315B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107463984A (en) * | 2017-09-22 | 2017-12-12 | 深圳怡化电脑股份有限公司 | Card reader |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1051910B (en) * | 1958-08-08 | 1959-03-05 | Telefonbau & Normalzeit Gmbh | Circuit arrangement for telephone systems with dialer operation for fritting the dialer and / or relay contacts located in the speech wires |
-
0
- NL NL73318D patent/NL73318C/xx active
- NL NL63302685A patent/NL142315B/en unknown
-
1949
- 1949-09-09 GB GB23375/49A patent/GB660521A/en not_active Expired
- 1949-09-11 DE DEP54596A patent/DE807955C/en not_active Expired
- 1949-09-12 FR FR995224D patent/FR995224A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107463984A (en) * | 2017-09-22 | 2017-12-12 | 深圳怡化电脑股份有限公司 | Card reader |
Also Published As
| Publication number | Publication date |
|---|---|
| NL142315B (en) | |
| DE807955C (en) | 1951-07-09 |
| NL73318C (en) | |
| FR995224A (en) | 1951-11-29 |
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