JPS54139399A - Transmission line continuity confirming system - Google Patents
Transmission line continuity confirming systemInfo
- Publication number
- JPS54139399A JPS54139399A JP4745378A JP4745378A JPS54139399A JP S54139399 A JPS54139399 A JP S54139399A JP 4745378 A JP4745378 A JP 4745378A JP 4745378 A JP4745378 A JP 4745378A JP S54139399 A JPS54139399 A JP S54139399A
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- continuity test
- circuit
- operation time
- bias state
- 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.)
- Pending
Links
Landscapes
- Emergency Alarm Devices (AREA)
- Alarm Systems (AREA)
- Fire Alarms (AREA)
Abstract
PURPOSE: To perform a transmission line continuity test simply and surely by providing a diode, which becomes a reverse bias state at a normal operation time and becomes a forward bias state at a continuity test time, and a circuit, which detects the current of the transmission line, in the continuity test for a sensor circuit, etc., of the automatic fire reporting system.
CONSTITUTION: In the transmission line where electronic smoke sensor S operated neutrally is connected in the circuit, diode DT is connected to the terminal of the transmission line, and further, polarity inverting switch SW2 is provided which switches the polarity of the circuit so that diode DT may become a reverse bias state at a transmission line normal operation time and become a forward bias state at a continuity test operation time. Further, sensor operating relay RY which detects the current flowing to the transmission line and ammeter AM for continuity test are provided. Then, switch SW2 is operated to perform the continuity test of conductive circuits on a basis of the rate of currents flowing to ammeter AM at a normal operation time and a continuity test time.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4745378A JPS54139399A (en) | 1978-04-20 | 1978-04-20 | Transmission line continuity confirming system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4745378A JPS54139399A (en) | 1978-04-20 | 1978-04-20 | Transmission line continuity confirming system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54139399A true JPS54139399A (en) | 1979-10-29 |
Family
ID=12775562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4745378A Pending JPS54139399A (en) | 1978-04-20 | 1978-04-20 | Transmission line continuity confirming system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54139399A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4507568A (en) * | 1982-05-03 | 1985-03-26 | Siemens Aktiengesellschaft | Device for initiating the remote feed of electrical users |
| US4562401A (en) * | 1982-11-12 | 1985-12-31 | Siemens Aktiengesellschaft | Circuit arrangement and method for fault locating in conjunction with equipment for the trunk feeding of electrical loads |
| US4731550A (en) * | 1984-09-10 | 1988-03-15 | Siemens Aktiengesellschaft | Circuit having a feed circuit for supplying current to a load resistor |
-
1978
- 1978-04-20 JP JP4745378A patent/JPS54139399A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4507568A (en) * | 1982-05-03 | 1985-03-26 | Siemens Aktiengesellschaft | Device for initiating the remote feed of electrical users |
| US4562401A (en) * | 1982-11-12 | 1985-12-31 | Siemens Aktiengesellschaft | Circuit arrangement and method for fault locating in conjunction with equipment for the trunk feeding of electrical loads |
| US4731550A (en) * | 1984-09-10 | 1988-03-15 | Siemens Aktiengesellschaft | Circuit having a feed circuit for supplying current to a load resistor |
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