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MEWOI-TW408A Class 1,1/1OCT,Sound Level Meter,SONÔMETRO,Decibelímetro Digital
INTRODUCTION
| MEWOI-TW408A,TW408B,TW409A,TW409B are new generation octave sound level meter,they update the dual core (DSP+ARM) architecture to single chip ARM with float point unit, and update all fix--point calculation to floatpoint calculation which significantlignificantlyy improves the accuracy and and stability. Re-design analog front end circuit also lower the noise floor and linear range of product. MEWOI-TW408A,TW408B are Class 1 , and TW409A,TW409B are Class 2. Both instruments have ccertificated by the China CPA (Certification of of Pattern Approval) and CMC (China Metrology Certification) |
MAIN FEATURES
| 1,Class 1 ( MEWOI-TW408A,TW408B ) and Class 2 (MEWOI-TW409A,TW409B) sound level meter |
| 2,Comply with IEC 61672 1:2013, ANS I S1.4 1983 and ANSI S1.43 1997 |
| 3,Real time 1/1 and 1/3 Octave in accord ance with IEC 61260 1:2014 and ANSI S1.11 2004 |
| 4,Linearity r ange: 22dBA~136 dBA ( MEWOI-TW408A,TW408B ), 25 dBA~136dBA (MEWOI-TW409A,TW409B) |
| 5,Single ran ge to cover 123dB ( MEWOI-TW408A,TW408B ) / 122dB (MEWOI-TW409A,TW409B) dynamic range |
| 6,Frequency weighting : A/B/C/Z. Time weighting Fast/Slow/Impulse |
| 7, 3 profile and 14 custom define measurement are calculate in parallel with different frequency/time weighting |
| 8,Calculate SPL, LEQ, Max, Min, Peak, SD, SEL, E |
| 9,LN statistic al and time history curve display |
| 10,User define integral period measurement , integral period up to 24h |
| 11,High speed ARM core with FPU (Float Point Unit) to achieve wide frequency response large dynamic range and low noise floor |
| 12,4G MicroSD card (TF card) mass storage |
| 13,RS 232 remote control port |
| 14,Mini thermal printer for measurem ent data print |
| 15,Internal GPS module ( optional), support GPS timing |
APPLICATION
| 1,Basic noise measurement |
| 2,Environmental noise assessment |
| 3,Product quality check |
| 4,Evaluation of noise reduction engineering |
The improvement of MEWOI-TW408A,TW408B,TW409A,TW409B
| 1,Single chip high speed ARM with FPU | 2,USB port function implement ed |
| 3,White backlight LCD | 4,U pdate firmware via USB (also power supply) |
| 5,Integral period from 1s~ 24h | 6,Timer feature support auto measurement |
| 7,0.1s, 0.2s, 0.5s logger step added | 8,Internal GPS (optional) with GPS timing |
| 9,5 templates to save user setting | 10,Single range to cover 123 dB dynamic range |
| 11,B weighting added to meet ANSI standard | 12,Reduce the noise floor (only for Class 1) |
| 13,Automatic power on with external supply ,ease of integration | 14,Upper limit of measurement:136 dBrms /139 dBpeak (4 0mV/Pa) |
TECHNICAL SPECIFICATION
| MEWOI-TW408A(Class 1+1/1OCT) | MEWOI-TW408B(Class 1+1/1OCT+1/3OCT) | MEWOI-TW409A(Class 2+1/1OCT) | MEWOI-TW409B(Class 2+1/1OCT+1/3OCT) | |
| Accuracy | Class 1 | Class 1 | Class 2 | Class 2 |
| Octave | 1/1OCT | 1/1OCT+1/3OCT | 1/1OCT | 1/1OCT+1/3OCT |
Real time 1/1 Octave: 8Hz-16kHz Real time 1/3 Octave(Optional)6.3Hz 20 kHz GBT3241-2010 , IEC 61260-1:2014 ANSI S1.11-2004 . Base 10 system | Real time 1/1 Octave: 20Hz-8kHz Real time 1/3 Octave(Optional) 20Hz-12.5kHz GBT3241-2010 , IEC 61260-1:2014 ANSI S1.11-2004 . Base 10 system | |||
Supplied Microphone | MPA231T: 1/2 pre polarized measurement microphone, Class 1. Sensitivity: 4 0mV/Pa. Frequency Range: 3 Hz~ 20kHz. | MPA309 T : 1/2 ” pre polarized measurement microphone, Class 2 . Sensitivity: 4 0mV/Pa. Frequency Range: 2 0Hz~ 12.5 kHz. | ||
| Mic Interface | TNC connecter with ICCP power supply ( 4mA | |||
| Detector / Filter | Fully float point digital signal processing (digital detector and filter | |||
| Integral Period | Infinite or 1s 24h user define integra l period. Repeat time: I nfinite or 1~9999 | |||
| Logger Step | 0.1s , 0.2s , 0.5s , 1s~24h | |||
Measurement Functions | LXY(SPL) SPL), L Xeq , L XY SD , L X SEL , L X E , L XYmax , L XYmin , L XPeak , L XN . Whe re X is the frequency weighting: A, B, C, Z; Y is time weighting: F, S, I; N is the statistical percentage 1 99 3 profile and 14 custom define measurement are calculat e in parallel with different frequency/time weighting | |||
| 24h Measurement | Automatic measurement based on user define date/time and save the history data | |||
| Frequency Weighting | Parallel A , B , C , Z It can also be applied to 1/1 and 1/3 Octave | |||
| Time Weighting | Parallel F , S , I and Peak detection | |||
| Self Noise | Sound: 19dB(A), 25dB(C),31dB(Z) Electrical:13dB(A), 17dB(C), 24dB(Z) | Sound:20dB(A), 26dB(C), 31dB(Z) Electrical:14 dB(A), 19 dB(C), 24dB(Z) | ||
| Upper Limit | 136dB(A), Increase to 154dB(A) with 5mV/Pa Microphone | |||
Frequency Response | 10Hz~20kHz | 20Hz~12.5kHz | ||
Level Linearity Range | 22dB(A)-136dB A,Octave: 30dB-136dB | 25dB(A)~136dB(A),Octave: 33dB-136dB | ||
| Dynamic Range | 123dB(13dB (A)~136dB(A)) | 122dB (14dB(A)~136dBA) | ||
| Peak C Range | 47dB-139dB | 50dB~139dB | ||
| Electrical I nput | Maximum input voltage: 5Vrms 7.07Vpeak ). Input impedance of preamplifier : >6 G Ω | |||
| Range Setting | Single range to cover whole dynamic range | |||
| Resolution | 24Bits | |||
| Sampling Rate | 48kHz | |||
| Time History | Time domain noise curve display. Duration time: 1min , 2min , 10min | |||
| LCD Display | 160x160LCD with white backlight, 14 step contrast level , 1s display update rate | |||
| Mass Storage | 4G MicroSD card ( TF card) | |||
| Post Processing | Post processing software VA SLM ca n read , analy ze and generate reports of store data | |||
| Export Data | Directly connect to the c omputer to read the memory card (USB disk) | |||
| Output | AC Output max 5V RMS , 15mA ), DC Output (10mV/dB , max 15mA, RS232 serial interface and USB (USB disk mode or modem | |||
| Alarm | User define alarm threshold. LED indicate the alarm status | |||
| Setup Template | 5 templates to save user setup for different application, template can be save in MicroSD card | |||
| Auto Power On | Automatic power on and start measurement when power supply available , ease of integration | |||
| Power Supply | 4x1.5V alkaline batteries (LR6/AA/AM3), sustainable use of approx. 1 0 hours depend s on battery). It also can be supply by external DC power ( 14V 500mA) and USB po wer (5V 1A) | |||
| RTC | Builtin backup battery has been calibr ated at factory to the error<26s in 30days (<10ppm, (25±16) ºC). It can keep RTC running when replacing the main batteries GPS timing function,available (optional with GPS) | |||
| Language | English, Chinese,Portuguese , Spanish , German, French | |||
| Firmware Update | Update firmware via USB port | |||
| Conditions | Temperature: 10º C 5 0º C. Humidity : 20 9 0 %RH | |||
| RT Temperature | Realtime tempera ture display on the main screen | |||
| Size (mm) | W70 x H300 x D36 | |||
| Weight | Approx. 620g , including 4 alkaline batteries | |||
| Optional | ||||
| GPS | Receiver Type: 50 Channels; Time To First Fix: Cold Start 27s , Warm Start 27s , Hot Start 1s Sensitivity: Tracking-161dBm , Reacquisition-160dBm , Cold Start-147dBm , Hot Start-156dBm Horizontal position accuracy: 2.5m , Timing accuracy: 30ns , Velocity accuracy: 0.1m/s Update Rate: 1Hz , Operation Limits: Dynamic ≤4g , Altitude<50000m , Velocity <500m/s | |||
| Calibrator | CA111, Class 1, 94dB/114dB, 1kHz | |||
| Printer | Mini thermal or dot-matrix printer, RS232 port | |||
NOTES:
Note 1:Ignore the result outside 20Hz~ 12.5kHz for type MEWOI-TW409 alone due to microphone frequency response of Class 2. |
Note 2: The data was measured with 40mV/Pa microphone for MEWOI-TW408 and TW409 Series. |
Note 3: Measurement according to GB/T 3785 and IEC 61672. |
Note 4: Measurement according to GB/T 3 241 and IEC 61260. |