User`s Manual Sound Level Monitor Model SL120
Contents
1. on an annual basis to insure calibration integrity ry Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies on sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website at www extech com click on Contact Extech and go to Service Department to request an RA number A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpos2. this product optional accessories and literature call or go to www extech com 6 Version 1 2 9 05 Measurement Considerations Use a windscreen not included to cover the microphone in windy conditions Calibrate the meter often especially if the meter has been idle for a long period of time Do not store operate the meter in areas of high temperature or humidity Keep the meter and the microphone dry Avoid severe vibration when using the meter aarp oNn gt Remove the battery when the meter will be stored for long periods of time Frequency Weighting curves Weighting Response Curves 30 Relative Response dB 40 50 20 50 100 200 500 1k 2k 5k 10k 20k Frequency Hz OSHA permissible levels Permissible Noise Exposure Limits Duration per Day hours Sound Level db A Slow response 16 85 8 90 6 92 4 95 3 97 2 100 1 1 2 102 1 105 1 2 110 1 4 or less 115 7 Version 1 2 9 05 Battery Replacement The 8 AA batteries are located in the rear battery compartment When the battery icon appears on the meter s LCD it is time to replace the battery Calibration and Repair Services Extech offers complete repair and calibration services for all of the products we sell For periodic calibration NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed
3. Applicable standards Meets IEC 60651 1979 and ANSI S1 4 1983 Type 2 SLM standards Display 4 6 x 3 125 multifunction LCD Frequency bandwidth 31 5 Hz to 8 KHz Microphone 0 5 Electret Condensor Microphone remoteable Measurement ranges 30 to 80dB 60 to 110dB 80 to 130dB Frequency weighting A and C Programmable Response time Fast 125ms Slow 1s Programmable Resolution 0 1dB Max Hold Maximum reading is displayed with time Alarm output 3 5mm Mono Phone Plug Maximum 3 4mA 5 Vdc Minimum Output Voltage 2 5 Vdc Limit range 30 to 130dB Under range indication ae of Over range indication OL Power 8 AA Batteries optional AC adaptor 9V 350ma Battery life 240hrs continuous approx 30 days 8hrs day Operating temperature 32 to 122 F 0 to 50 C Operating humidity Dimensions Weight Less than 80 RH 8 75x7 1x1 25 0 63 Ibs 22x18x3 2mm 285g 2 Version 1 2 9 05 Meter Description 1 Microphone Over Limit Display Bargraph dB display OFF ON AUTO switch Clock display 3 2 Max level display with time stamp 4 Set limit MAX RESET button oo NOAA O LV Rear Panel 1 Range select switch 1 2 3 45 6 2 Time set buttons x 3 Limit set buttons soon tal Meat olo 4 Calibration adjustment 60 110 0 5 A C select button 6 F S select button 3 Version 1 2 9 05 Sou
4. User s Manual EXTECH INSTRUMENTS Sound Level Monitor Model SL120 EX TECH Sound Level Monitor SL120 oh MAX Cho sete al lg LIMIT A S 71508 gt Meets ANSI and IEC Type 2 Sound Level Meter Standards gt Settable High Limit with large OVER indication and Alarm Output gt Wall or Desk mountable gt Extra large LCD display with bargraph gt Maximum level display with time stamp gt Optional alarm kit drives remote over limit indicators Introduction Congratulations on your purchase of the Extech SL120 Sound Level Monitor Designed for wall mount desk tripod mount or hand held operation this meter meets ANSI and IEC Type 2 Sound Level Meter standards Included is a High Limit Set Point with a large OVER indication when the set level is exceeded An Alarm Output can be used in conjunction with the optional Alarm Module Kit to power a larger or a remote indicating device such as a QUIET sign Professional features include programmable A C Weighting and Fast Slow Response time Max Memory with time stamp and a Clock display The microphone can be rotated 180 degrees to accommodate any meter location or it can be placed at a remote location using the optional Remote Microphone Cable A programmable ON OFF time extends battery life to 30 days when programmed 8 hours per day Careful use of this meter will provide years of reliable service Specifications
5. ar the display and start a new measurement session press the 4 10 3 15 front panel MAX RESET button If the measured level exceeds the maximum for the range selected the MAX display will indicate OL overload Programmable OFF ON AUTO time The meter is powered by 8 AA batteries or via an AC adaptor for permanent installations Continuous battery life is approximately 240 hours 10 days By programming the ON OFF time the battery life can be greatly extended 30 days assuming an 8 hour day The ON and fg times are programmed as described in the initial configuration paragraph The meter will operate continuously with the power switch in OFF a AUT the ON position The ON OFF time will be controlled by the meter when IC the power switch is set to the AUTO position Calibration The sound level meter should be calibrated on a regular basis to assure that the meter s performance and microphone sensitivity has not change Some operational directives require daily calibration checks OSHA Extech offers several acoustic calibrators to perform the calibration 1 Set the meter to the 60 to 110dB or 80 to 130dB range 2 Place the external calibrator over the Sound Level Monitor s microphone and turn the Calibrator on 3 The meter should read close to the calibrator s dB output level Typical Calibrator output levels are 94dB and 114dB 4 Ifthe meter is within 0 2 dB of the calibrator s output no adjustment
6. e and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied Copyright 2004 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 8 Version 1 2 9 05
7. ickly changing levels Select Slow response for most applications Range Selection Slide the Range switch to the 30 80 60 110 or the 80 130 position ta B m The selected range will be indicated on the LCD bargraph If the 60110 measured dB level exceeds the range selected OL will be displayed If the measured dB level is below the selected range will be displayed Normally select the range in which the upper dB level is greater than any expected sound pressure level The 60 to 110dB range is the most commonly used range Use the 30 to 80dB range in quieter areas such as offices and classrooms 60 Note When the range is changed the Max display may indicate an overload OL Press the MAX RESET button to clear the MAX display 4 Version 1 2 9 05 Over Limit Set Press the up or down LIMIT arrow buttons to set the OVER limit e LI M IT level as displayed on the LCD If the measured dB level exceeds LIMIT the set limit the IJ indication will appear in the display and the 75 7 dB over limit signal will appear at the alarm output connector The L display indication and output signal will remain active as long as the sound pressure level exceeds the set limit MAX Hold The MAX display indicates and holds the highest dB level measured Z MAX since the meter was turned on or since the Max Reset button was GA TB pressed The time and date of the max reading is also displayed F mA To cle
8. is necessary 5 Adjust the calibration pot on the rear of the meter to the proper level 5 Version 1 2 9 05 Meter Placement The meter can be used Handheld Wall mounted Desk mounted or Tripod mounted For wall mount operation orient the microphone perpendicular to the wall to minimize the affect of acoustic reflections For desk mounting extend the rear legs and lock in place with the hinged locks The tripod mounting nut is located on the bottom of the unit A Remote Microphone optional The optional 15 remote microphone cable can be used to place the microphone in one location while viewing the dB levels and or generating a high limit alarm at another location To remove the microphone unscrew the holding collar and lift the microphone off the connector The extension cable can then be plugged into the matching connectors Calibration should be performed after the cable is installed Alarm Output optional The alarm output drives the optional Remote Alarm Relay Module cable and relay when the LIMIT set point is exceeded The relay module can be used to power external warning signs QUIET signs or other indicating devices when the sound level is higher than the programmed limit Refer to the manual supplied with the module for connection information HEARING PROTECTION Relay Module REQUIRED Indicating Device Vv AC or DC Power Note For up to date information on
9. nd Level Monitor Operation Initial Configuration 1 Install 8 AA batteries 2 Setting the TIME a Press and Hold the Time SET button until the hours display begins to flash ser b Press the Time up arrow button until the hour is set c Press the SET button The minutes display will flash Adjust as needed d Press the SET button to step through and the arrow button to adjust Time of day Hour Time of day Minutes Time of day AM PM 24 Hour Year Month Day Auto ON Hour Auto ON Minutes Auto OFF Hour Auto OFF Minute A C Frequency Weighting Change the Frequency Weighting by pressing the Q A C button The A or C icon will appear on the display 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 enforcement C weighting is a much flatter response and is suitable for the sound level analysis of machines engines etc Most noise measurements are performed using A Weighting and SLOW Response Slow Fast Response Press the button to select Fast or Slow response as desired F or S will appear in the bottom of the LCD display 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 qu
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