Sound Level Meter with Graphic Display

Like Sound Meter 840029 model, 840028 also covers 30-130dB in the A scale and 35-130dB in the C scale with a resolution of 0.1dB and an accuracy of +/-1.5dB. Model 840028 also meets ANSI S 1.4 type 2 and IEC 651 type 2, and includes A & C decibel frequency weighting scales, fast or slow response, AC or DC output, low battery indicator, peak function and can be calibrated in compliance with OSHA using Acoustical Calibrator 850016.

In addition our new model 840028 contains many advanced features including: An even larger LCD display with an analog bar graph, auto-ranging, min/max functions and an RS232 computer interface. Another special function allows you to accurately measure equipment noise in the presence of high background noise. CE Approved. Comes ready to use with a windscreen, 9V battery, instructions, and a hard shell carrying case.

Specifications
Dimensions:	11" x 3" x 1 ½ " (256 x 80 x 38 mm)
Weight:	Weight: 8.5 oz (240 gr.)
Display:	3½ digits LCD,
Range:	6 ranges in 10-dB step: 30-80dB, 40-90dB, 50-100dB, 60-110dB, 70-120dB, 80-130dB
Auto Range:	30-130dB
Accuracy:	±1.5dB
Frequency:	31.5Hz to 8KHz
Microphone Size:	6mm(Diameter) Electric condenser Microphone
Measurement Weightings:	Level A	30dB-130dB
	Level C	35dB-130dB
Response:	Fast - readout is maximum value at 0.2 seconds Slow - readout is maximum value at 1.5 seconds
Output Signal:	AC - 0.707Vrms at full scale DC - 10mV per dB
Quasi-Analog Bar Indicator:	1dB display steps, 50dB display range, Updated every 50ms.
Operating Temperature:	32 to 122F(0 to 50°C)
Operating Humidity:	10-90% Relative Humidity
Power Supply:	One 9V battery (approximate life-20 hours alkaline)
Accessories:	Hard Vinyl Carrying case, Microphone wind shield, instructions, battery