SOUND LEVEL METER
Contents
1. Display 14mm 0 55 LCD with backlight Parameters measured Lp Lmax Leq Ln Measurement range Lp 30 130dB A 35 130dB C 35 130 dB F Leq 30 130dB 10s Imin 5min 10min 15min 30min 1hour 8hour 24hour Ln 0 100 Resolution 0 1 dB Accuracy 1dB Frequency weighting A C F Flat Time weighting Fast 125ms Slow 1 second o o N Microphone 1 2 inch electret condenser type Memory 30 groups with measuring conditions Built in calibration signal 94dB at 1kHz sinusoidal Frequency range 20 to 12 500 Hz Alarm value set 30 130 dB Alarm output contact NC PC interface RS232C Low battery indication Power supply 4x1 5v AAA UM 4 battery LED and optional relay inside 11 BATTERY REPLACEMENT 11 1 When battery voltage less than approx 5v it is necessary to replace the batteries 11 2 Install a the batteries correctly into the case 11 3 If the instrument is not to be used for any extended period remove batteries Note If AC adapter is used batteries should be taken away the period of measurement time just press G for about 8 seconds till Leq is on the display release the key then select the set time among 10s Imin 5min 10min 15min 30min lhour 8hour 24hour by depressing Up or Down key To quit just depress any key except Gor key 7 HOW TO SET THE ALARM VALUE The alarm LED is on when the instant measurement value is larger than or equal to2. the alarm value set The default setting value at the factory is 85dB Users can change it to any value between_30 130dB by following steps Depress for about 5 seconds release it after AL shows on display then press key or key to preset the alarm value as desired To quit just depress any key except p or GS key 8 HOW TO SET THE TIME OF AUTO POWER OFF The default setting for auto power off at the factory is 5 minutes That means the meter will auto power off 5 minutes from the time of last key operation Users can change it to any value between 1 9 minutes by following steps Depress for about 10 seconds release it after AUT O shows on display then press or key to preset the time as desired To disable the function of auto power off just preset the time to 0 It will 7 4x1 5v AAA UM 4 5 STORING AND RECALLING READINGS 5 1 When in M state you can save the reading together with measuring conditions to the memory of the meter by pressing the key Then the icon M changes to M automatically while the number of memorized readings increases 1 5 2 No matter in M state or M state the memorized data can be browsed by depressing the key The browsing state is marked in R on display When in R state all the readings memorized can be recalled by depressing the key or G5 key 5 3 To delete the memorized value in memory just enter the browsing state and locate the reading to be deleted by the key or key then dep
3. 1 Main Unit Sy Se ise el Ga Sal ah tw Saw ee ae Ipc ee eee ee REE 2 Carrying Case lt gt poss ee 3 Operation Manual pest 4 Windscreen tpe ee ee eee Optional Accessories 1 ND9 sound level meter calibrator 2 Cable and software for RS232C 3 External relay 4 AC adapter 3 FRONT PANEL DESCRIPTIONS 3 6 3 1 3 2 a 3 8 3 3 3 4 3 9 3 5 3 10 3 1 Calibration Mark 3 6 Function Mark 3 2Time Weighting 3 7 Battery indicator 3 3 Memory state 3 8 Max Hold 3 4Mark for Ln 3 9 Number Memorized 3 3 5 Weighting Icon 10Browsing Icon 4 3 Check whether the weighting is right If not change it by depressing the isi key to select A C or Flat With A weighting selected the frequency response of the meter is similar to the response of the human ear A weighting is commonly used for environmental or hearing conservation programs such as OSHA regulatory testing and noise Ordinance law C weighting is a much flatter response and is suitable for the sound level analysis of machines engines etc NOTE Weighting A will be automatically selected when measuring Leq 4 4 Use the key to select a Fast 125 ms ora Slow 1 second response time Select Fast to capture noise peaks and noises that occur very quickly Select the Slow response to monitor a sound source that has a consistent noise level or to average quickly changing levels Select Slow response f
4. 4 Type 2 Widely used to test the sound level of environment machinery vehicle ship and other noise e Multifunctional It offers 4 measurement parameters Lp sound level Leq Equivalent Continuous A Sound Level Lmax Maximum Sound Level and Ln Percent of all readings over alarm value set With alarm set and alarm output This meter permits choice of A C or Flat weighting and Slow Fast response times DC output 0 1 3V10mV dB Auto range selection and digital display with no guessing errors e Manual or automatic shut down The tester can be switched off by pressing the power key at any time On the other hand The tester can be set to auto power off between 1 to 9 minutes or disable auto power off The tester can memorize 30 groups of measurement results and measuring conditions for later use or download to PC Can communicate with PC computer for statistics printing and analysing by the optional cable and the software for RS232C interface TABLE OF CONTENTS 2 SPECIFICATIONS sss cies eee sete saves aes 3 FRONT PANEL DESCRIPTIONS 4 MEASURING PROCEDURE eeeeene 5 STORING AND RECALLING READINGSererereeren 6 HOW TO SET THE LEQ TIME evesen 7 HOW TO SET THE ALARM VALUE 8 HOW TO SET THE TIME OF AUTO POWER OFF veeereeeeeeeeermeree 9 CALIBRATION e eeerteerererirriresstrererreeens 10 CONSIDERAT IONS ereere 11 BATTERY REPLACEMENT teres 2 SPECIFICATIONS
5. Can only be shut down manually in such a case 9 CALIBRATION The standard method to calibrate the meter requires an external ND9 calibrator in addition to a small screw driver 9 1 Calibrate the meter by the ND9 a Turn the meter ON b Put the meter in the A weighting mode c Put the meter in the SLOW response mode d Place the microphone into the calibrator Turn the calibrator ON e Adjust the meter s CAL potentiometer so that the meter s display matches the output of the calibrator 9 2 Calibrate the meter by the built in signal To enter the calibration state just switch on the meter depress the wm key till the icon CAL is on the display Then use a screw driver to adjust the meter s CAL potentiometer so that the meter displays 94dB 10 CONSIDERATIONS 10 1 Wind blowing across the microphone increases the noise measurement Use the supplied windscreen to cover the microphone when applicable 10 2 Do not attempt to dismantle the meter yourself There are no user serviceable parts 8 MULTIFUNCTIONAL SOUND LEVEL METER This Sound level meter is small in size light in weight easy to carry Although complex and advanced it is convenient to use and operate Its ruggedness will allow many years of use if proper operating techniques are followed Please read the following instructions carefully and always keep this manual within easy reach FEATURES Compatible with standards of IEC 651 Type 2 ANSI 1
6. or most applications 4 5 The reading is the peak one if the icon max appears on the Display The reading is an instant value if max does not show up The appearance of symbol max is controlled by depressing the key in the process of measurement
7. ress the key If there is an Err0 on the display it indicates there is no reading to delete any more 6 HOW TO SET THE LEQ TIME Leq is used to assess the rms average noise level over a preset period of time often the starting point of a noise assessment To take a Leq measurement the period of time over which it is to be made must be selected The longer the period of measurement time the more accurate the Leq reading will be To set 3 11 Microphone 3 12 Display 3 13 Alarm LED 3 14 Weighting key 3 15 Fast Slow key 3 16 Up Save key 3 17 Down Read key 3 18 Function key 3 19 Max hold key 3 20 Power key 3 21 Delete Menu 3 22 Cal adjusting 3 23 Jack for RS 232C interface 3 24Jack for output 3 25 Jack for AC 3 26 Battery Compartment Cover 4 MEASURING PROCEDURE 4 1Press the e key Fig 1 3 20 and release to switch on the power 4 2Check whether the function selected is right If not change it by depressing the key The default setting is Lp weighting A Fast Lp current sound pressure level Leq Equivalent Continuous A Sound pressure Level i e Arithmetically mean value ina period of time set Lr Statistic analysis i e What percent of all measurement values are larger than or equal to the alarm value set by the user For setting the alarm value please see page 7 4 External DC power supply 6 VDC 100mA Size 236x63x26 mm 9 3x2 5x1 0inch Weight 170g including batteries Standard delivery
Download Pdf Manuals
Related Search