Extech 407750 噪音计带PC接口，30 -130 dB

Digital Display: 3-1/2 digit (1999 count) Autorange LCD
Bargraph Display:  50dB display range (1dB resolution);
Measurement Range: 30 to 130dB (35 to 130dB for “C” weighting)
Resolution: 0.1dB
Accuracy:  ±1.5 dB @ 94dB for a 1kHz sine wave
Microphone  Electret Condensor: 6mm dia type
Frequency Weighting:  “A” and “C” type
Time Response:  Slow/Fast
Sampling time: updates every 0.5seconds
Measurement frequency range:  31.5Hz to 8KHz
Analog output:  AC: 0.707Vrms (full scale); DC: 10mVDC/dB
Applicable Standards:  IEC 651 Type 2, ANSI S1.4 Type 2
Power Supply:  9V battery
Dimessions:  256 x 80 x 38mm
Weight: 8.5oz. (240g)
Complete with batteries and carrying case