JPS5481799A - Conduction test circuit of fire alarm - Google Patents
Conduction test circuit of fire alarmInfo
- Publication number
- JPS5481799A JPS5481799A JP15008377A JP15008377A JPS5481799A JP S5481799 A JPS5481799 A JP S5481799A JP 15008377 A JP15008377 A JP 15008377A JP 15008377 A JP15008377 A JP 15008377A JP S5481799 A JPS5481799 A JP S5481799A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- current
- break
- constant
- 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
- Fire Alarms (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
PURPOSE: To make it possible to detect accurately the breaking of a fire alarm circuit without providing specially a testing power supply, by attaching a constant- current circuit.
CONSTITUTION: Constant-current circuit CC is provided which is connected to power supply E1 via normally break side NO of alternation switch S1, and its constant-current output is flowed to the parallel circuit composed of fire detector S3 and resistance Re, thereby detecting its output terminal voltage. With switch S1 is switched to NO at this time, current I1 flows from power supply E1 to the parallel circuit via circuit CC and through the setting of the resistance value, voltage drop ReI1 of resistance Re becomes lower than voltage Vc of detector S. Then, when the circuit operates normally, the voltage between L and C indicates ReI1; since current I1 flows to detector s3 in case of a break at point A, and the voltage between L and C becomes higher than voltage Vc and when a break occurs before the parallel circuit, it indicates the maximum voltage of circuit CC. It is therefore detected accurately by measuring the output voltage whether a break is occurring or not.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15008377A JPS5481799A (en) | 1977-12-13 | 1977-12-13 | Conduction test circuit of fire alarm |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15008377A JPS5481799A (en) | 1977-12-13 | 1977-12-13 | Conduction test circuit of fire alarm |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5481799A true JPS5481799A (en) | 1979-06-29 |
Family
ID=15489132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15008377A Pending JPS5481799A (en) | 1977-12-13 | 1977-12-13 | Conduction test circuit of fire alarm |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5481799A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51129197A (en) * | 1975-05-02 | 1976-11-10 | Matsushita Electric Works Ltd | Continuity test circuit of fire alarm |
-
1977
- 1977-12-13 JP JP15008377A patent/JPS5481799A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51129197A (en) * | 1975-05-02 | 1976-11-10 | Matsushita Electric Works Ltd | Continuity test circuit of fire alarm |
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