发明名称 |
METHOD FOR TESTING SENSITIVITY OF SMOKE SENSOR |
摘要 |
PROBLEM TO BE SOLVED: To provide a method for testing sensitivity of a smoke sensor capable of using no real smoke, suppressing generation of noise of a circuit, and surely conducting a sensitivity test of the smoke sensor. SOLUTION: When an operation test command or a non operation test command is transmitted to the smoke sensor to be tested from a fire receiver 6, a microcomputer 4 transmits an operation test signal SG1 or a non operation test signal SG2 on the basis of the operation test command or the non operation test command to a light emission current control circuit 12 of a drive control circuit 12 and a gain changeover circuit 90 of an amplification part 9 through a sensitivity adjustment control circuit 13 of a light projecting and receiving circuit 3. The light emission current control circuit 121 of the drive control circuit 12 increases a light emission amount of a light emitting element 1, and the gain changeover circuit A changes over to a value corresponding to an operation test or a non operation test and increases a gain of the operation amplifier for amplifying a light receiving signal. The microcomputer 4 compares a level of an output signal OS outputted from the light projecting and receiving circuit 3 with an alarm threshold value previously set.
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申请公布号 |
JP2002352348(A) |
申请公布日期 |
2002.12.06 |
申请号 |
JP20010158304 |
申请日期 |
2001.05.28 |
申请人 |
MATSUSHITA ELECTRIC WORKS LTD |
发明人 |
NISHIKAWA NAOYUKI;OKA SHOICHI;SAKAMOTO KOJI;SAKAMOTO SHINJI;HAYASHI MASANORI |
分类号 |
G01N21/53;G08B17/00;G08B17/10;G08B17/107;(IPC1-7):G08B17/107 |
主分类号 |
G01N21/53 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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