Clock and calendar function.
AC and DC analog signals output, which can be linked to frequency analyzer or X-Y axis recorder.
Background light for working in the night. to save power, the background light shines for 5 seconds,
then closes automatically.
Secondary plasticizing meter shell.
Good circuit designed to save power, the battery can be used for a long time.
Ⅳ
. Specifications
Accuracy
：
± 1.5dB
Response frequency: 31.5Hz — 8kHz
Dynamic range: 50dB
Frequency weighting: A\C
Time weighting
：
FAST 125ms, SLOW 1sec
Microphone
：
Electret Condenser microphone
Digital display
：
4 digitals, resolution 0.1dB,sampling rate 2 times/s
Analog bar display
：
Each analog bar is as 1dB,
sampling rate 20 times/s
Measurement ranges
：
30 — 80dB, 40 — 90dB,50 — 100dB,
60 — 110dB, 70 — 120dB,80 — 130dB.
Total of 6 ranges
Auto-range
：
Micro-computer can choose the best
measurement ranges
Over range indicator
：
UNDER(less than range) and OVER
(over range )
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