NEW Vernier SLM-BTA Sound Level Meter w/ Sound Level Meter Cable & Manual

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(5199) 99.7%,

Location: Henderson, Tennessee
Ships to: US,
Item: 176588480372

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All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money Back
Vernier:Vernier
Unit Type:Unit
SLM-BTA:SLM-BTA
MPN:SLM-BTA

New in box item, stored in green crate 52, No batteries included.The Sound Level Meter measures sound level in decibels. It can be used for activities such asEnvironmental noise studiesSound level comparisonsInvestigating room acousticsSound isolation modelingSound propagation modelingNote: Vernier products are designed for educational use. Our products are not designed nor are they recommended for any industrial, medical, or commercial process such as life support, patient diagnosis, control of a manufacturing process, or industrial testing of any kind.Using the ProductThe Sound Level Meter functions as a standalone device, and you can monitor sound levels by reading the LCD panel.If you want to collect sound level data, you need to connect the Sound Level Meter to a data-collection interface. To do so, connect the sensor following the steps in the Getting Started section of this user manual. For most classroom activities, the following settings on the Sound Level Meter work well:Slide the power switch to the appropriate range.Set the time weighting switch to S.Set the maximum level hold switch to RESET.Set the frequency weighting to A.For in-depth sound studies, you may need to choose different settings more appropriate for your experiment.Power/Measurement Range SwitchThis slide switch, labeled “O/35–90/75–130,” turns on the sensor and sets the measurement range. When set to the 35–90 range (LO), the sensor is designed to measure sound levels in the range of 35 to 90 dB. When the switch is set to the 75–130 range (HI), the sensor is designed to measure sound levels in the range of 75 to 130 dB. A range warning will appear if the measured sound is beyond the range of the current setting. If this warning appears continuously, set the switch to the appropriate range.Time WeightingThe S/F switch just below the LCD sets the time weighting. For normal measurements set the switch to the slow setting (S). For fluctuating noise, set the weighting to fast (F). In the classroom, you will probably set it to S.Maximum Level HoldSetting the MAX/RESET button to MAX sets the LCD display to show the maximum, weighted sound level. In the classroom you will probably set it to RESET, in which case it will continually display the sampled reading. If you are using the Sound Level Meter without a Vernier interface, you can use the MAX setting to record and display only the loudest sound level. Setting this switch to MAX does not affect the output signal sent to the data-collection interface.Frequency WeightingThe A/C switch is used to set the weighting scale. A-weighted setting is the sound level value that most closely matches that of the human hearing range. It is the weighting scale most commonly used for Occupational Safety and Health Administration (OSHA) and Department of Environmental Quality (DEQ) regulatory measurements. The C-weighted scale is useful for monitoring sources such as engines, explosions, and machinery. This setting would also be used if you use the Sound Level Meter to get the total unweighted sound level of the noise source. For more details about A vs. C weighting scales, see www.vernier.com/til/3500The sensor comes with a foam windscreen. The windscreen helps reduce the detection of false high signals caused by wind blowing across the microphone. It also protects the microphone from dust and debris.CalibrationYou should not need to calibrate the Sound Level Meter for classroom use. Calibration is possible, but it will require access to a special calibrator, capable of producing sound at a particular frequency at a pre-determined sound level, not commonly available in the classroom.SpecificationsSensor1/2″ electret (prepolarized) condenser microphonePowerFour AAA batteriesBattery life50 hours typicalDisplay3 1/2″ LCDMeasurement rangeLow: 35 to 90 dBHigh: 75 to 130 dBFrequency range31.5 to 8000 HzResolution0.1 dBAccuracy1.5 dB (ref 94 dB @ 1 kHz)OutputDC: 10 mV/dBAC: 1.0 Vrms corresponding to the top of the selected rangeStored calibrationSlope: 100 dB/VIntercept: 0 dB/VHow the Sensor WorksThe Sound Level Meter uses an electret condenser microphone mounted on the end of a shaft. The output of this microphone is fed into a series of filters, amplifiers, integrators, and adder circuits to produce a single sound pressure level measurement. The Sound Level Meter uses a directional microphone, which requires the instrument to be pointed in the direction of the noise source unless ambient noise levels are being monitored.Suggested Sound Level StudiesYou can collect sound level data in many real-world situations; for example, you canCollect sound levels before, during and after a concert or dance.Collect sound levels throughout the day in a school hallway or shopping mall.Use the Sound Level Meter to judge cheering contests at pep rallies.Collect data outside and inside a car equipped with a stereo system.Make a model of an ear and ear canal. Measure sound levels at the “ear drum” when a headset is placed over the ear. Repeat the experiment but place an earplug between the headset and the meter.Set up the Sound Level Meter to collect readings in a variety of situations. Use the following chart to determine the acceptable duration for exposure to the sound level you measure.The following chart shows the sound level exposure rates set by the OSHA Occupational Noise Exposure Standard. In a work environment, for example, it is acceptable to be exposed to 90 dB for eight hours as measured on the A-weighted scale. If the sound level is 100 dB, the acceptable duration is two hours.Duration per day (hrs)Sound level, slow-response (dBA)8.0906.0924.0952.01001.01050.51100.25115Example Sound LevelsSourceSound Pressure Level (dBA)Large rocket (nearby)180 to 194Jet aircraft150Shotgun blast145Propeller aircraft140Pneumatic riveter, threshold of pain130Rock concert, thunder120Construction noise110Subway train100Heavy truck90Noisy restaurant80Busy traffic, normal radio70Normal conversation, dishwasher60Quiet office50Library40Soft whisper30Rustling leaves20Normal breathing10Threshold of hearing0Standard Octave Band Frequencies Ranges with Corresponding A and C Weighting ValuesCenter Frequency (Hz)Effective Band (Hz)A Weighting (dB)C Weighting (dB)31.522.1–44.2–39.4–3.06344.2–88.4–26.2–0.812588.4–177–16.1–0.2250177–354–8.60500354–707–3.201000707–1,4140020001,414–2,8281.2–0.240002,828–5,6571.0–0.880005,657–11,314–1.1–3.0

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