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Principle of Measuring Accumulated Noise Exposure
| DOSE is a parameter used to quantify noise exposure measured in a period, during turns of % noise exposure relative to 90dBA for 8 hours. i.e. 100% DOSE = 90dBA for 8 hours This is known as the Criterion. Other criterion are available such as 100% DOSE = 85dBA for 8 hours to meet legislation in different countries. If the person stayed in this environment for 4 hours, he would receive 50%DOSE. Also if the noise level was say 93dBA, 3dB higher, a 100% DOSE would be accumulated in only 4 hours, The above example is for a dose meter with 3dB Exchange Rate, where a 3dB increase in sound level corresponds to a doubling energy. A dose meter with 5dB Exchange Rate is also, available where the sound must increase by 5dB to double the dose as required to meet noise legislation in some countries. |
MAIN FEATURES
| The Noise Dose Meter measure the frequency weighted noise exposures and peak sound levels simultaneously. |
| 1,Simple operation, including direct read–out of results. |
| 2,Eight built–in standard dose measurement setups : OSHA80, OSHA90, MSHA-80, MSHA-90, DOD, ACGIH, ISO85 and ISO90. |
| 3,Nine user – defined measurement setups. |
| 4,A single sound level meter (SLM) setup. |
| 5,50 dose (DATA) result stores. |
| 6,Download of setups from PC to the meter. |
| 7,Keypad lock protects meter against accidental operation. |
| 8,Timers support pre–selection of measurement time and duration. |
| 9,Use USB data output to connect with PC. |
TECHNICIL SPECIFICATION
TECHNICAL SPECIFICATION | |
Applied Standards: | IEC61252, ANSI S1.25 – 1992 for dose meter and sound exposure meters. IEC 61672-1-2013 Class 2 |
Microphone: | 1/2-inch electret condenser microphone with 31-inch integral cable |
Display | Liquid Crystal Display |
Measurement Ranges (Linearity and Indicator ranges at 4KHz) | 60 – 130 : 60 – 130dB (A and C), 70 – 140 : 70 – 140dB (A and C) |
Peak Ranges (C–weighted or Linear Peak over the top 40dB of each measurement range) | 60 – 130 : 93 – 133dB Peak, 70 – 140 : 103 – 143dB Peak |
Frequency Weightings: | RMS Detector: A or C, Peak Detector: C or Z (Linear), |
Time Weightings: | Fast and Slow (RMS detector) |
Selectable thresholds : | 40 to 90dB |
Exchange rates: | 3, 4, 5 and 6dB |
Stabilization Time | 10 seconds from power on |
Threshold and Criterion Levels (From the setup, predefined in the built – in setup according to applicable standards) | User–defined setups in the following ranges : Threshold Level : 70 – 90dB in 1dB steps, Criterion Level : 80, 84, 85 or 90dB |
Criterion Level : 80, 84, 85 or 90dB | At 0.1dB above the top of the selected measurement range |
At 0.1dB above the top of the selected measurement range | Under–Range Indications |
High Level Detector | 115dB |
Keypad Lock | Lock and unlock by pressing key combinations: Up and right arrows to lock; left and down arrows to unlock |
Clock | Real–time clock with calendar |
Memory | Results from 50 measurements can be stored for later viewing and download |
Measurement Control | Measurement Duration : May be set to 5, 10, 15, or 30 minutes or 1, 2, 4, 8, 10, 12, or 24 hours |
Timers | Up to 16 timers(automatic start and stop)can be set(maximum up to one month ahead of measurement time) |
Timer Controlled Started / Stop | Set up from the PC software or meter keypad |
Logging | All measurement parameters values can be logged |
Logging Period (LP) | 1s, 2s, 5s, 10s, 15s, 20s, 30s, 1min, 2min, 5min, 10min, 15min, 20min, 30min or 60min |
Logging Capacity | 120000 values can be stored at any one time |
Setup | Eight built–in (predefined) default setups are included. Nine additional user–defined setups can be stored |
Output | USB interface |
Power Supply | 4x1.5V AAA Size (UM-4)Battery |
Battery Indicator | Symbol indication battery voltage level in 4 steps. Indicator flashes when voltage is insufficient for operation |
Operating Temperature & Humidity | 0 – 50ºC (32 to 122ºF) ,10 – 90%RH |
Storage Temperature & Humidity | -10 – 60ºC(14 to 140ºF) ,10 – 75%RH |
Size | 140x72x34mm |
Weight | Approx. 350g (including batteries) |
Accessories | Main Unit, External Probe, Screwdriver, Carrying Case (B04),Manual |
