2. SPECIFICATIONS
Circuit Custom one-chip of microprocessor LSI
circuit.
Display LCD size : 50 mm x 30 mm
LCD with green backlight ( ON/OFF ).
Measurement SPL : Sound pressure level
Type Dose：test noise exprosure
Measurement SPL：Auto 30 - 130 dB.
Range Dose：70～130dB
Resolution 0.1 dB.
Function dB ( A & C frequency weighting ),
Time weighting ( Fast, Slow ),
Data hold
Record ( Max., Min. ).
Accuracy Characteristics of " A " frequency weighting
(23 ±5 ℃) network meet IEC 61672 class 2.
Under 94 dB input signal, the accuracy
are :
31.5 Hz ±3.0 dB
63 Hz ±2.0 dB
125 Hz ±1.5 dB
250 Hz ±1.5 dB
500 Hz ±1.5 dB
1 K Hz ±1.0 dB
2 K Hz ±2.0 dB
4 K Hz ±3.0 dB
8 K Hz ±5.0 dB
Remark :
The above spec. are tested under the
environment RF Field Strength less
than 3 V/M & frequency less than 30
MHz only.
2
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