Sound Measurement - Page 32

Manufacturer: Koolertron Brand: Koolertron Model: CJ04 Color: WHITE

Features: Plotted graph and recorded data are printable High accuracy up to ±1.5 dB With 2 equivalent weighted sound pressure levels A and C FAST / SLOW time weighting selection Maximum value hold function Automatic power off when idle for 10 minutes Bar graph indication for sound level range Tested compatible with Microsoft Windows XP / Vista / 7 (32 bit and 64 bits) Specifications: LCD display: 4 digits LCD size: 2.2 inch (55 mm) Display: 0.5 secretary Measuring Level: 30 ~ 130 dB(A) Accuracy: ±1.5 dB Frequency Response: 31.5 Hz ~ 8.5 kHz Resolution: 0.1 dB Sound Level: Level 1: 30 ~ 80 dB Level 2: 50 ~ 100 dB Level 3: 60 ~ 110 dB Level 4: 80 ~ 130 dB Level 5: 30 ~ 130 dB Dynamic Range: 50 dB / 100 dB Frequency Weighting Characteristic: A / C Analog Bar Graph: 1 dB / 1 bar graph Sampling Rate: 20 times / second PWM Signal Output: duty cycle = 0.01 x dB value x 100% / 3.3 Dynamic Characteristic (Time weighting): FAST(high speed) / SLOW(low speed) Calendar Accuracy: ±30 seconds / day Microphone: 0.5 inch polarization capacitance microphone Power Supply: 4 x 1.5V AA battery (not include)or USB Cable Power Life: about 20 hours continuous use (alkaline battery) Operating Temperature: 0 ~ 40 °C (32 ~ 104 °F) Operating Humidity: ≤80 % R.H. Dimensions: approx. 256 (L) x 70 (W) x 35 (H) mm (10.1 x 2.8 x 1.4 inch) Weight: approx. 308 g (without battery) Package Include: 1 x Professional Sound Level Meter 1 x Sponge Ball 1 x USB Cable 1 x Software CD 1 x SD memory card(512M) 1 x English Instruction Manual

Manufacturer: Supco Brand: Supco Model: EM80 Color: Multicolored

The Supco EM80 auto-ranging digital sound level meter has a range of 30 to 120 dB and is used to analyze excessive sound level problems. The meter performs A-type frequency weighting in four ranges (60 dB, 80 dB, 100 dB, and 120 dB). It has a 0.1 dB resolution, a 1.5 dB accuracy for measurements under 94 dB, and a frequency range of 31.5Hz to 8KHz. The LCD displays measurements digitally and on a bar graph. Bar graph response time is 0.25 seconds and digital response time is 0.75 seconds. The meter complies with European Union (EU) 93/68/EEC, IEC 651 Type 2, and ANSI S1.4 Type 2 standards for sound-level meters for general field use. The meter has an operating temperature of -32 to +104 degrees F (0 to 40 degrees C) and operating humidity of 10 to 80 percent RH. It is powered by three 1.5V AAA batteries (included). The meter is 6-3/32 x 2-25/64 x 1-3/16 inches (H x W x D) and weighs 5.2 oz. (180g). The meter includes a carrying case.

Manufacturer: Extech Brand: Extech Model: SL125

These sound level meters not only meet ANSI Type 2 and ENIEC60651 specifications, they put the data to work for you. The large LCD display has high contrast digits and a bargraph and has LED indicator that can be viewed from 100 feet whether placed on a desk or mounted on a wall. The optional remote alarm relay module can be used in conjunction with the meter to illuminate warning signs if a high limit is exceeded. Bright LEDs (red flashing or green) alert user when sound level is too high or too low - LEDs can be read from 100 ft Continuous monitoring of sound level Wall, desk or tripod mount Ideal for industrial, auditoriums, schools and other areas where there is a need for being alerted when sound level reaches set point Meets ANSI Type 2 and ENIEC60651 accuracy specs - Compliant to OSHA User settable high or low limit (30 to 130 dB) indication with output to drive external relay module Microphone rotates 180° for desired placement. Optional 15 ft microphone extension cable for remote monitoring

Manufacturer: Wensn Brand: Koolertron Model: MCJ06 Color: Black

Introduction: This eauipment has been designed to meet the measurement reauirement of safety engineers, health, industrial safety offices and sound quality contaol in various environment, which include factory, traffic, family and audio sysytem. Features: High accuracy up to ±1.5 dB Resolution: 0.1 dB Wide measuring range: 30 ~ 130 dB Frequency Response: 31.5 Hz ~ 8.5 kHz 1/2 Electret Condenser Microphone DC 10V 1500mA supply. Specifications: WS3130A Digital Sound Meter Easy to carry, and may log data any time Real-time data sampling analysis Conformed to the IEC651 Type2 and ANSIS1.4 Type2 standards 2.3-inch digital high brightness display Measuring Level: 30 ~ 130 dB(A) (automatic) Sampling Rate: 20 times / second below 2000 meter in height Operating condition: 0-40 Degrees Celsius,10-70%RH Storage Environment:-10-50 Degrees Celsius,10-80%RH Dimensions: approx. 194x109x16mm Weight: approx. 630 g Package Includes: 1 x Professional Sound Level Meter 1 x Power 1 x English Instruction Manual Caution: Do not operate the meter at high Humidity environment. Please unplug the power from the power jack. The meter use only at indoor

Manufacturer: Reed Brand: REED Instruments Model: ST-4023

Conforms to IEC61672-1 Class 2 sound level meters. 1/2" electret condenser microphone. 4-digit LCD with bargraph indication. A and C frequency weighting. Fast and Slow time weighting. Maximum hold with elapsed time indication. Manual data memory and read. Datalogging function (99 sets). Analog AC and DC outputs. Includes batteries, adjustment screwdriver, wind shield ball, and instruction manual. Specifications: Measurement Range: 30 to 130dB. Resolution: 0.1 dB. Accuracy: +/-1.5 dB. Frequency Range: 31.5 Hz to 8 kHz. Frequency Weighting: A and C. Time Weighting: Fast and Slow. Microphone: 1/2" Electret condenser microphone. Display: 4 digital LCD, updated every 0.5s; quasi analog bar indicator 1 dB steps, 60dB display range, updated every 0.125s. Memory capacity: 99 data sets. Analog output: 2VACrms (f.s.), 10mVDC/dB. Power supply: Four 1.5V LR-6/AA size alkaline batteries, AC adapter. Battery life: about 50 hours. Measures 258mm length by 68mm width by 27mm height.

Manufacturer: Gain Express Holdings Ltd. Brand: Gain Express Model: ND-9

All sound meters drift with time and require periodic recalibration, some models have an internal oscillator that enables you to adjust the signal and correct the reading but this doesn't take into account, the microphone. In order to adjust to adjust the entire system including microphone you need an accoustical calibrator like ND-9. It has two output levels of 94 dB and 114 dB. The calibrator generates these fixed sound level signals for calibration of sound level meters. This model works with any digital sound level meter. The unit ships with a ½" adaptor installed to accommodate sound meters and microphones with 1" or 1/2" microsphone. Effect of Atmospheric Pressure and Temperature: Most calibrators including ND-9 are affected by altitude. To correct for atmospheric pressure in areas of high altitude the transducer diaphragm within the calibrator creates the sound as it vibrates against the air. When the air is thinner (at higher elevations) a lower sound level is produced. ND-9 is calibrated to produce 94dB at sea level. When the unit is operated above se level a slightly lover sound level is emitted depending on altitude. For each 2000ft of elevation sea ND-9 produces 0.1dB less than the 94dB rating. Applications: Sensitivity calibration for microphones. Suitable for acoustics field and laboratory use Specifications Output Sound Level: 94db & 114db Accuracy: ±0.3db(20°C, 760mm Hg) Frequency: 1000±0.1%Hz (allows calibration with A,B,C or D weighting networks or linear) Temp. range: -10~50°C (14~122 °F) Storage (with battery removed) -40~65°C (-40 ~ 149 °F) Extremely low influence of static pressure Temp.coefficient : 0 ~ 0.01dB/°C Power Supply: 9v Battery Battery life approx.100 hours Size and Weight: 48x48x138mm , 250g