CM-140 Manual - Galaxy Audio
Contents
1. Press again to select MIN value and press again to select current value with MAX MIN enunciator blinking Press and hold down button for 2 seconds to exit the MAX MIN mode Note If change sound level range or change A C weight the MAX MIN mode will clear Frequency Weighting Select Button A A Weighting For general sound level measurements C C Weighting For checking the low frequency content of noise Ifthe C Weighted level is much higher than the A weighted level there is a large amount of low frequency noise Time Weighting Select Button FAST for normal measurements SLOW for checking average level of fluctuating noise Level Range Control Button Each time the level button is pressed the level range will change between Lo level Med level and Hi level in the circular manner Microphone 1 2 inch Electret condenser microphone CM 140 SPL METER AC OutputTerminal 1 Vrms Corresponding to each range step Output impedance 100 ohms Output signal by standard 3 5mm coaxial socket signal on pin Signal Ground CAL Potentiometer Calibration control for level calibration adjustment Battery Cover V Calibration Procedures Using a standard Acoustic Calibrator 94dB 1KHz Sinewave Acoustic calibrator Screwdriver IEC 651 TYPE Il CM 140 SPL METER 1 Make the following switch settings Display dBA Time Weighting FAST Mea2. CHECK MATE CM 140 Instruction Manual G A A XO UD 0 x LU LLI 2 l 2 l Q r4 je v CONTENTS TITLE PAGE I Safety Information 1 Il General Description 1 2 Ill Specifications 2 3 IV Name and Functions 4 5 V Calibration Procedures 6 7 VI Measurement Preparation 7 VII Operating Precautions 7 8 VIII Measurement 8 CM 140 SPL METER I Safety Information Read the following safety information carefully before attempting to operate or service the meter Use the meter only as specified in this manual otherwise the protection provided by the meter may be impaired gt Environment Conditions Altitude up to 2000 meters Relative humidity 90 max Operation Ambient 0 to 40 gt Maintenance amp Clearing Qualified personnel should only perform repairs or servicing not covered in this manual Periodically wipe the case with a dry cloth Do not use abrasives or solvents on this instrument gt Safety symbols C Comply with EMC When servicing use only specified replacement parts II General Description Thank you for using our Sound Level Meter To ensure that you can get the most from it we recommend that you read and follow the manual care
3. FS means the upper limit of each level range Electromagnetic Compatibility RF field 3V m Total accuracy specified accuracy 0 5dB Power Supply One 9V battery 006P or IEC 6F22 or NEDA 1604 Power Life Approximately 70hours Alkaline Battery Operation Temperature 0 to 40 32 to 104 Operation Humidity 10 to 90 RH Storage Temperature 10 to 60 14 to 140 Storage Humidity 10 to 75 RH Dimensions 9 1 L x2 1 W x1 3 H 23 1cm x5 3 cm x3 3cm Weight 170kg 0 37 lbs including battery Accessories 9V battery instruction manual and windscreen CM 140 SPL METER IV Name And Fu THE Oime IEC 651 TYPE I Windscreen If you ope nctions 6 6 e CE ries A e rate at wind speed over 10m sec please put protective accessories in front of the microphone Display Minmum indication Maximum indication Low battery indication 4 Sound Level readout Fast response r Slow response ES MAX MN FAST SLOW dBAT EELEE l A Weighting l C Weighting Under range l Over range W_________ Range Indicate 4 CM 140 SPL METER Power Button The key turns the sound level meter ON or OFF MAX MIN Hold button Press lif button to enter the maximum and minimum recording mode Select the proper level range before using MAX MIN to ensure that reading value will not exceed the measurement range Press once to select MAX value
4. fully before use This unit conforms to the IEC651 type2 ANSI S1 4 Type2 for Sound Level Meters This Sound Level Meter has been designed to meet the measurement requirements of safety engineers health industrial safety offices and sound quality control in various environments Q Range from 32dB to 130dB at frequencies between 31 5Hz and 8 KHz CM 140 SPL METER D Display with 0 1dB steps on a 4 digit LCD D Two equivalent weighted sound pressure levels A and C Q AC signal output is available from standard 3 5mm coaxial socket suitable for a frequency analyzer level recorder FFT analyzer graphic recorder etc III Specifications Standard Applied IEC651 Type2 ANSI S1 4 Type2 Frequency Range 31 5Hz to 8KHz Measuring Level Range 32dB to 130dB Frequency Weighting A C Microphone 1 2 inch electret condenser microphone Display LCD Digital Display 4 digit Resolution 0 1dB Display Update 0 5 sec Time Weighting FAST 125mS SLOW 1 sec Level Ranges Lo 32 dB to 80 dB Med 50 dB to 100 dB Hi 80 dB to 130 dB Accuracy 1 5dB under reference conditions 94dB 1kHz Dynamic Range 50 dB Alarm Function OVER is when input is more than upper limit of range UNDER is when input is less than lower limit of range MAX MIN Hold Hold readings the Maximum and Minimum Value 2 CM 140 SPL METER AC Output 1 Vrms at FS full scale Output impedance Approx 100 Ohms
5. source consists of short bursts or only catching sound peak set response to FAST To measure average sound level use the SLOW setting Select A weighting for general noise sound level and C weighting for measuring sound level of acoustic material 3 Select desired level 4 Hold the instrument comfortably in hand and point the microphone at the suspected noise source The sound pressure level will be displayed When MAX MIN maximum minimum hold mode is chosen the instrument captures and holds the maximum and minimum noise level for a long period using any of the time weightings and ranges Press the MAX MIN button 2 seconds to clear the MAX MIN reading MAX MIN symbol disappears G 6 Turn OFF the instrument CM 140 SPL METER G KE DD 0 60 1E Pawnee Wichita KS 67211 356 263 2852 FAX 356 263 0642 www galaxyaudio com
6. surement Mode MAX MIN Mode function disable Level Range 50 to 100dB 2 Insert the microphone housing carefully into the insertion hole of the calibrator 3 Turn on the switch of calibrator and adjust the CAL potentiometer of the unit The level display will indicate the desired level All our products are well calibrated before shipment Recommended Recalibration cycle 1 year VI Measurement Preparation 1 Battery Loading Remove the battery cover on the back and put in one 9V Battery 2 Battery Replacement When the battery voltage drops below the operating voltage this symbol E I will appear Replace 9 Volt battery VII Operating Precautions 1 Wind blowing across the microphone will bring additional extraneous noise When using the instrument in the presence of wind itis a must to mount the windscreen to not pick up undesired signals 2 Calibrate the instrument before operation if the instrument was not in use for a long time or operated in bad environment humidity environment when notin use 7 CM 140 SPL METER 3 Do not store or operate the instrument at a high temperature or in a high humidity environment Keep microphone dry and avoid severe vibration Take out the battery and keep the instrument in a low GE Vill Measurement Open battery cover and install a 9V battery in the battery compartment 2 Turn power ON and select the desired response time and weighting If the sound
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