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-9- 

 

Linear range 4kHz 

30-130dB 

Linear range 1kHz 

30-130dB 

LCPeak maximum (500Hz, 1kHz, 8kHz) 

133dB 

Self-generated noise floor 

A weight = 25dB 

C weight = 35dB 

Self-generated noise floor with mic fitted 

A weight = 25dB 

C weight = 35dB 

Dummy microphone capacitance 

18pF 

Recommended dummy microphone 

HY7314 

Multi-frequency acoustic calibrator correction data (set to pressure 

and

 

test on A weighting)

 

Frequency 

Correction 

125Hz 

0.0 

1kHz 

0.2 

8kHz 

2.6 

Free field correction for HY205 microphone. 

Frequency/kHz 

Free field 

Correction/dB 

 

Frequency/kHz 

Free field 

Correction/dB 

1 

0.1 

 

6.3 

1.7 

1.25 

0.1 

 

8 

2.6 

1.6 

0.2 

 

10 

4.4 

2 

0.3 

 

12.5 

5.3 

2.5 

0.5 

 

16 

6.5 

3.15 

0.7 

 

18 

7.1 

4 

1.0 

 

20 

7.8 

Содержание MEWOI-JY218

Страница 1: ...Sound Level Meter MEWOI JY218 Class 1 User Manual www mewoi com ...

Страница 2: ......

Страница 3: ...I First time use 1 III Technical Specification 1 IV Structure 3 V Display interface 4 VI Keypad interface 5 VII Instrument operation 5 VIII Calibrating the meter 8 IX Reference Information for Periodic Testing 8 X Serial connection 11 ...

Страница 4: ... using your meter for the first time please check the contents of your instrument s case which should include the following 1 Sound level meter and Class 1 microphone 2 Windshield 3 2 x AA batteries Not included for Air Shipment Before starting a measurement remove the black microphone protective cap if fitted and where necessary place the windshield carefully over the end of the microphone capsul...

Страница 5: ...2 x AA LR6 1 5V batteries or 5V DC via Mini USB input Battery life 24 hours with alkaline batteries Microphone pre polarized electret condenser 50mV Pa Operating temperature 10 C to 50 C Operating humidity 25 90 Atmospheric pressure 65kPa 108kPa Storage Temperature 20 C to 60 C Dimensions 215mm 68mm 32 mm Weight 220g including battery Electrical Outputs AC tip 3 5mm jack and DC middle 3 5mm jack D...

Страница 6: ... Display 3 Control Keypad 4 Connectors 5 Connectors 6 Tripod mount 7 Battery Cover 8 RS232 9 AC DC Output 10 USB Microphone Backlight Display Control Keypad Connectors Tripod mount Battery Cover RS232 for Printer USB Power Input AC DC Output ...

Страница 7: ...button 3 Measurement display Under range indicator Measurement Indicator Overload indicator Measurement Type Battery Level Measurement Data Calibrator level Correction to Be applied Measurement Data Overall Measurement Value Under range Overload Indicator Measurement Duration ...

Страница 8: ...easurement calibrate the instrument as per the guidance in Chapter 8 of this manual 7 1 Selecting the frequency and time weighting Select the measurement frequency and time weighting required To toggle between A C and Z weighting press To toggle between fast slow and impulse weighting press Measurement start stop Perform calibration Soft key CAL Print Time weighting toggle Reset max min LCpeak Fre...

Страница 9: ...time weighting LZI Z frequency weighting and impulse time weighting To toggle the measurement values press This will toggle through the following measurement values if the meter is set to LAF LAF LAFMax LAFMin LCpeak LAF Integrating averaging measurements Lxeq1s and Lxeq8h are available for measurements on the instrument 7 2 Maximum minimum and LCpeak values Maximum minimum and LCpeak values are s...

Страница 10: ...t arrow buttons Overload and under range are denoted by the and v indicators in the top right corner of the screen After stopping a measurement the overall measurement values are displayed Press the left right arrows to scroll through the overall measurement values If a printer is attached the results can be printed by pressing Print The measurement view can be cancelled by pressing Exit ...

Страница 11: ...calibrator Use the arrow keys to set the CORRECT value to 0 2dB which will make the adjustment for the gap between the calibrator and the microphone pressure field of the acoustic calibrator and the free field of the instrument and microphone This will result in the meter reading 93 8dB when a 94dB calibrator is used Switch on the acoustic calibrator and press to automatically calibrate the meter ...

Страница 12: ...microphone capacitance 18pF Recommended dummy microphone HY7314 Multi frequency acoustic calibrator correction data set to pressure and test on A weighting Frequency Correction 125Hz 0 0 1kHz 0 2 8kHz 2 6 Free field correction for HY205 microphone Frequency kHz Free field Correction dB Frequency kHz Free field Correction dB 1 0 1 6 3 1 7 1 25 0 1 8 2 6 1 6 0 2 10 4 4 2 0 3 12 5 5 3 2 5 0 5 16 6 5 ...

Страница 13: ...ndshield Correction Uncertainty 63 0 0 0 27 125 0 0 0 27 250 0 13 0 05 0 27 500 0 18 0 08 0 27 1000 0 09 0 1 0 27 2000 0 16 0 26 0 27 4000 0 01 0 53 0 32 8000 0 10 0 26 0 30 16000 0 17 0 58 0 29 Add the above data to your measurement to correct Directionality plots and case reflection plots ...

Страница 14: ...evel after receiving command L Maximum level M Send maximum level after receiving command M Minimum level N Send minimum level after receiving command N LCpeak P Send LCpeak after receiving command P Reset R Reset the maximum minimum and LCpeak value after receiving command R and then send R as the response Toggle frequency F Toggle the frequency weighting between A C and ...

Страница 15: ...because the parameters cannot be changed during the measurement They will just send the responses to tell the user that the instrument has received the commands The data format of instant level maximum minimum and LCpeak got from the instrument start byte 0x01 data 5 bytes checksum 2 bytes end byte 0xFF for example prefixes 0x are omitted 01 30 39 34 2E 32 00 FD FF 30 39 34 2E 32 is the hex data o...

Страница 16: ...Your Testing Specialist ...

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