Sound Level Meter called (noise meter) is the most basic noise measurement instruments. Sound level meter generally consists of a condenser microphone, preamplifier, attenuators, amplifiers, frequency weighting network and RMS indication table top components. Sound level Total works: the microphone converts sound into electrical signals, and then by converting impedance preamplifier, so the microphone attenuator matching amplifier output signal to weighting network, the signal frequency weighting (or external filtering. device), and then by the attenuator and amplifier amplifies the signal to a certain magnitude, finally, after the digital circuit processor, display the corresponding values ​​on the LCD.

Technical Parameters
sensor	1/2 inch condenser microphone
Measuring range	30 ~ 130dB
Measurement Accuracy	± 1.5dB
Frequency response	31.5HZ ~ 8.5KHZ
Frequency weighting	A / C
data communication	-
data analysis	-
data storage	-
AC / DC signal output	Have
Low power tips	Have
Overload tips	Have
Resolution	0.1dB
Time weighting	Fast / Slow
Maximum locking	Have
Packing
power supply	AA * 4 batteries (with an external power jack)
Product Weight	300g
Product Size	265 * 70 * 35mm
Packing	Boxed
Standard Carton capacity	20pcs
Standard Carton Size	62.5 * 45 * 28.5cm
Standard Carton Gross Weight	17kg