技术参数：
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applicable stangdards
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iec pub 60651 type2, ansi s1.4 type 2
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digital display
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4digital lcd, 0.1db resolution,up-dated every 0.5s
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measurement level
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25～130db
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measurement frequency range
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31.5hz to 8 khz
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frequency weighting
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a and c
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time weight
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fast and slow
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microphone
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1/2 inch electret condenser microphone
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measurement level range
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5 ranges in 10-db step:25～80db 30～90db 40～100db 50～100db 60～120db 70～130db
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quasi-analong bar indicator
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1-db steps,60db display range ,up-dated every0.125s
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display warning function
overrange indicator
underrange indicator
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ov displayed at the upper limit
un displayed at the lower limit
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manual data memory capacity
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99 sets
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analong ac/dc output
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2vrms (at full scale), 10mvdc/db
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power supply
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one 9v battery (006p to iec6f22) ac adapter
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battery life
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about 50 hours
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weight
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approx.310g
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