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Contents
1. 6 silii Chok 6 d o erc mae 6 Rechargeable Baten suse sicot ODER ORIGO o5 602 ER CUPS 6 onore E E 6 Changing the Calibration Level 6 GAIN AON ere ce eas 7 GallbrattoD CHECK i iE t 7 Operating and Measurements nennen eene nnn n nn nnn n nnn nnne nnn nnns 8 Operaio E Mu Hc NS 8 Meter Microphone PIacelTIglll suse oe eoe e Ex xt oo pe wERR TE R ERR HERRERA CBE 8 NOISE 5 12 2 mad den Le mated Pate mi Wk e EE a Ka alea 8 Background NoisesE xamiple neut nep are 9 usos erm unes datas uen vet 9 Gam Recording Datalo goin x inco ds 10 Technical InformallOl 11 Principles OF ODE AU OM 11 a EE 12 Microphone response PCR 12 Microphone preamplifier extension en 13 Input BUTTOE erent ate ebd2. Health amp Environmental Safety Division 1100 2100 Sound Level Meter Models Easy to Use 1100 2100 SLM User Manual TTT Environmental Instruments and Supplies The preferred source for instrument Rentals Sales Service and Supplies 4201 B Street 25420 74th Avenue S Anchorage AK 99503 Kent WA 98032 907 770 9041 253 373 9041 www tttenviro com info tttenviro com 1100 2100 Sound Level Meters Owner s manual 6 Note Due to the new ATEX Directive in Europe all references in this document to Ex or EEx for intrinsic safety approvals should be disregarded effective 7 1 03 within the member countries of the European Union EU At this time this product is not approved in accordance with the new ATEX Directive and is not sold for use in hazardous atmospheres or explosive zones by customers within the EU Outside of the EU all references to intrinsic safety continue without change Introduction The 1100 Sound Level Meter is a light weight easy to use Type 1 instrument The 2100 is a Type 2 model The purpose of this manual is to provide you with the necessary information to operate the 1100 2100 Sound Level Meter as well as the remote able versions of the 1100R 2100R The entire manual should be read to fully understand the many features this instrument offers Copyright This document is copyrighted by Quest Technologies a 3M company Permission is hereby granted t
3. ruere Du Do ke Sex etel 13 A amp G Weighting ua voa Lesen ert a Pan rre er ein ee br edi er 14 Elg re 12 FasLresDOllS uei maa e Seat vida vc aaa vus a ct a 15 Figure T3 15 056 652 Rev D 1100 2100 SLM models Introduction 1 Introduction 1100 2100 Models Introduction The Quest models 1100 and 2100 Sound Level Meters and their remote versions 1100R 2100R measure frequency weighted and time averaged sound pressure level and are shown in Figures 1 and 1 2 Applications include laboratory industrial community military and audiometric measurement or analysis 1100 2100 Models The models 1100 and 2100 are easy to use hand held meters with an LCD display that provides a numerical readout They are housed in a rugged RF shielded injection molded case The meters are operated with simple slide switches An output jack is provided for connecting to peripheral devices such as chart recorders oscilloscopes audio recorders etc The model 1100 provides Type 1 accuracy for critical measurements while the model 2100 provides Type 2 accuracy for general field survey work As both meters are operationally identical this manual will refer only to the model 1100 except where appropriate Microphone Fixed Preamp Housing for the 1100 is longer than 2100 Display of the 2100 model Figure 1 1 Sound Level Meter 2100 model 056 6
4. Nicad type rechargeable 9 V batteries such as Radio Shack 23 299 7 2 V 120 mAh and an appropriate charger may be used with the 1100 The fact that nicad 9 V replacement cells typically operate at 7 2 V will be observed as shorter battery life approximately 8 hours with Radio Shack 23 299 At the appearance of the LOBAT indicator the nicad battery must be recharged NiMH Nickel Metal Hydride batteries are NOT recommended This is due to the excessive discharge of the typical NiMH cell prior to the voltage dropping low enough to activate the LOBAT indicator Calibrate Changing the Calibration Level NOTE There may be times when it is necessary to change the calibration level that is stored in the meter This calibration level is the decibel level that is produced by your calibrator gt Changing Cal level 1 Turn the meter The display will show a All segments for 2 seconds b The meter revision number for 2 seconds c The current calibration level stored in the meter for 5 seconds 2 While current calibration level is in the display press and hold both the RESET and CAL buttons for at least 1 2 second or until dashes appear in the display Release the RESET and CAL buttons The meter is now in the calibration level set mode 056 652 Rev D 1100 2100 SLM models 7 Checking the battery Calibration 57 NOTE the RESET and CAL buttons are continuously held down after the dashes appear the unit will interpret th
5. nr nares entree nen rub Quo up dots 13 056 652 Rev D 1100 2100 SLM models lil Table of Contents Characters iGS inia tReabeu vie vec edt osa 14 Iitermal Electcal NOISQ 14 TOME nice E P 15 Specioal S zi oo aciei EE e 16 PAGCOSSOMCS ee ER 18 QUEST SEVICE eC 19 Contacting Quest Technologies eisiaa aeaa a 19 ntermatlonab Custome cers inea e Ae 19 Figures Figure 1 1 Sound Level Meter 2100 model semen 1 Figure 122 Model 1190 2100 iiie iioii bise piis is 2 Figure 2 Keypad Control switches identified 4 Figure gt cOutputjack GONMECCIIONS sin eine aia ats a ide aie 5 Figure 4 Effects of background noise i i ae ee nter aes eaten 9 Foodies ENSCO WO 9 Figure 6 Block diagram of the model 1100 2100 5 circuit 11 Figure 7 Typical microphone response 1 12 Figure 8 Typical microphone response 2 12 Figure 9 Frequency Amplitude limitations with extension cables 13 Figure 10 Input b lfer CIEC ll y
6. check page 7 Set the RESPONSE WEIGHTING and RANGE dB switches as needed Hold set or tripod mount the meter in the desired location If a MAX measurement is needed be sure to reset the meter before taking the measurements It is always a good idea to document all measurement conditions and meter settings for possible future reference Meter Microphone Placement Whenever possible the meter should be tripod mounted in a relatively open area to minimize reflections from the body or other large reflective structures Avoid placement against a wall or in a corner A threaded bushing on the back will accept a standard 1 4 20 tripod fitting The microphone cartridges used on the models 1100 and 2100 are free field microphones Point the meter directly at the noise source 0 degrees Random incidence measurements may be taken with the 1100 if the plastic random incidence corrector supplied with the BK4936 microphone is used The random incidence corrector is a black plastic lipped sleeve packed in the BK4936 packing container To attach the corrector position the end of the sleeve without the lip over the grid of the microphone and gently press down until a snap fit is achieved Point the microphone approximately 70 to the direction of the sound Background Noise Background noise can cause considerable error in measurement when its intensity is close to that of a particular sound source of interest When it is not possible to
7. the MAX mode the RESET button may be held down for as long as the SPL display is desired Upon release of the RESET button MAX will be reset and the 1100 will resume accumulating MAX The RESET button also functions as an up arrow during setup see Changing the Calibration Level page 6 CAL Button This button is primarily used to enter the Calibration routine but it also functions as a down arrow during setup see Changing the Calibration Level page 6 Weighting A or C Response Fast or Slow Range 30 to 140 dBA Measurement SPL or MAX Figure 2 Keypad Control switches identified 056 652 Hev D 1100 2100 SLM models 5 Getting Started Overload Detection and Underrange Overload Detection and Underrange The Overload Indicator is displayed whenever the incoming signal saturates overloads the circuitry It is the sign on the left side of the display If the overload indicator is on while taking measurements in a Low range increasing the dB Range switch should cause the overload to disappear If you are already on the highest range setting and an overload condition still exists the sound level that you are measuring is beyond the capability of the 1100 due to either an extremely high rms value or a high crest factor peak to rms ratio Underrange is indicated by a Ur in the display When the noise level drops below the bottom of the range this indicator will turn on Switching to a lower range will turn it of
8. warranty outside the United States a minimum of one year warranty applies subject to the same limitation and exceptions as above with service provided or arranged through the authorized Quest distributor or our Quest European Service Laboratory Foreign purchases should contact the local Quest authorized sales agent for details 056 652 Rev D 1100 2100 SLM models Quest Technologies 3M company is world class manufacturer and leader in the field of occupational safety industrial hygiene and environmental instrumentation Quest prod ucts are used in more than 80 countries worldwide Quest has a strong reputation of rugged reliable instrumentation and software systems that monitor and evaluate occupational and environmental health and safety hazards including noise vibration heat stress indoor air quality and toxic combustible gases Quest monitoring instruments serve a variety of occupations and industries with clients in mining research enforcement military education insurance and manufacturing business sectors Visit www questtechnologies com for further information QUEST TECHNOLOGIES Occupational Health amp now part of 3M Environmental Safety Division Quest Technologies a 3M Company ISO 9001 Registered Company ISO 17025 Accredited Calibration Lab www questtechnologies com 1060 Corporate Center Drive Please recycle Printed in USA Oconomowoc WI 53066 2011 3M Customer Service 262 567 915
9. 52 Hev D 1100 2100 SLM models 2 Introduction 1100 2100 Models Microphone Remote Preamp Figure 1 2 Model 1100R 2100R 056 652 Rev D 1100 2100 SLM models Getting Started 3 Getting Started The Display Getting Started The Display The LCD display provides a numeric readout of sound level in 0 1 dB increments along with a LOBAT low battery indicator In the SPL mode the numeric display provides a reading of the maximum sound pressure level measured during the previous second In the MAX mode the display holds the highest reading encountered since the meter was placed in MAX or since the last time RESET was pressed The LOBAT indicator will light when the battery voltage is too low to allow accurate reading The display will show a sign when signal peaks cause an overload condition in the electronics This indicator signals the user to switch to the next higher range to prevent erroneous readings The display will show Ur if signal levels are too low to provide an accurate reading This indicator signals the user to switch to a lower range setting Meter Controls OFF SPL MAX Switch With the switch set to SPL the meter continuously displays sound level automatically updating the current reading at a rate of once per second Setting the switch to MAX causes the display to hold the highest SPL encountered thus far As a higher SPL occurs the display changes to show the new va
10. 59 523 BK 4936 The impedance of this microphone is approximately 12pF The microphone screws directly onto either the remoteable preamp or the fixed microphone extension of the meter case A typical response curve for the Type 1 microphone is shown in Figure 7 The model 2100 is designed to accept a prepolarized electret type 2 microphone Quest P N 056 316 QE7052 The impedance of this microphone is approximately 15 pF The microphone screws directly onto either the remoteable preamp or the fixed microphone extension of the meter case A typical response curve for the Type 2 microphone is shown in Figure 8 Microphone response time CAUTION When installing or removing the microphone do not unscrew the protective grid Do not touch the metal foil microphone diaphragm under this grid as permanent damage may result ACTUATOR METHOD PRESSURE Figure 8 Typical microphone response Type 2 056 652 Rev D 1100 2100 SLM models 13 Technical Information Microphone preamplifier extension cables Microphone preamplifier extension cables On 1100R Remote units the preamplifier is removable by unscrewing the black plastic collar below the preamplifier housing The 1100 will drive up to a 10 foot cable with minimal loss Quest offers the following lengths of remote cable for use with the 1100 59 899 ICM 2 Microphone Cable 2 foot length 59 733 ICM 10 Microphone Cable 10 foot length 59 734 ICM 50 Microp
11. 7 All rights reserved Toll Free 800 245 0779 056 652 Rev D 1 11
12. W or FAST and or C weighting Set the measuring range so that the calibration level falls within it NOTE Attempting to calibrate out of range will result in an Err on the display and a failed calibration The previous calibration data will remain in the instrument 6 Pressthe CAL button CAL will appear on the display followed by moving dashes After about 2 seconds the display will show either a P for pass or an F for fail If the calibration fails check settings and repeat procedure Calibration Check is a good idea to check calibration after use To do so perform the previous steps 1 through 5 Observe the meter display it should read the calibrator level 0 5 dB If out of tolerance run calibration procedure described above in Calibration 056 652 Hev D 1100 2100 SLM models Operating 6 8 Operating and Measurements Measurements Operation Operating and Measurements Operation Before taking measurements with the model 1100 there is a series of quick checks and considerations that should be performed or noted After switching the unit ON check for a LOBAT indication on the display replace battery if necessary See Battery check page 6 Although the model 1100 will maintain accurate calibration over a long period of time the calibration should be checked and the meter re calibrated if necessary before each use The calibration should also be checked after each use See Calibration
13. ading on the LCD display by 16 7mV dB 1V 60dB This output capable of driving up to 100 feet of shielded or twisted pair cable is intended for use with a 0 to 1 volt DC input chart recorder or data acquisition device that has a high input impedance The output impedance is 1000 ohms Chart recorder input impedance may cause loading of this output which should be taken into account Multiplication factors for the above numbers are given below for various chart recorder input impedances Input impedance of recorder Multiply DC voltage by 10 KOHM 20 KOHM 50 KOHM 100 KOHM 056 652 Rev D 1100 2100 SLM models 11 Technical Information Principles of Operation Technical Information Principles of Operation The Quest model 1100 uses low noise low power analog and digital integrated circuitry to ensure long battery life maximum stability and superior reliability over a wide range of environmental conditions Figure 6 is a block diagram of the model 1100 2100 s internal circuit operations Microphone gt WEIGHTING i FILTER OVERLOAD DETECT RMS LOG CONVERSION MICROPROCESSOR A O Converter LCD DISPLAY Figure 6 Block diagram of the model 1100 2100 s circuit board 056 652 Rev D 1100 2100 SLM models 12 Technical Information Microphone Microphone The model 1100 is designed to accept a pre polarized electret type 1 microphone Quest part number 0
14. dustrial and community noise measurements Generally C weighting is used for measuring noise reduction in hearing protectors and for other scientific purposes a onl em e e i ik 2k FREQUENCY Hr Figure 11 A amp C Weighting Internal Electrical Noise The normal measurement range of the 1100 meter is approximately 30 to 140 dBA and 40 to 140 dBC The inherent noise level is typically 24 dBA 056 652 Rev D 1100 2100 SLM models 15 Technical Information Tone Burst Hesponse Tone Burst Response Figures 12 and 13 show the meter response to a sine wave input of various pulse durations for Fast and Slow settings RESPONSE dB LATIVE RE SPONSE dB RELATIVE PULSE DURATION t SECONDS Figure 13 Slow response Nominal decay times for each time response setting are as follows e FAST 34 7 dB per second e SLOW 4 35 dB per second 056 652 Rev D 1100 2100 SLM models 16 Specifications Specifications Tone Burst Response Specifications Standards Model 1100 Type 1 Model 2100 Type 2 ANSI 1 4 1983 R1997 IEC 651 1979 EN60651 Display 3 1 2 Digit Liquid Crystal Display Level display indicates to 0 1 dB resolution Annunciator is included for Battery Check Modes of Measures sound pressure level SPL or Operation maximum level MAX Linear 32 to 140 dBA Operating Range Electrical Noise Floor Frequency Weighting Networks Meter Response Micr
15. eliminate or reduce the background noise use the curve shown in Figure 4 to correct for the effect of the background noise on the measurement 056 652 Rev D 1100 2100 SLM models 9 Operating and Measurements Background Noise Example Background Noise Example For example if the background noise is 45 dB and the sound of interest measures 51 dB the difference between measurement and background noise is 6 dB From Figure 4 for a 6 dB difference 1 3 dB should be subtracted from the measurement The correct measurement is therefore 51 dB 1 3 dB 49 7 dB eb eee d E 2 3 ne m r3 Fe Lill m E ea E ul dB DIFFERENCE BETWEEN MEASUREMENT BACKGROUND NOISE Figure 4 Effects of background noise Windscreen Effects To prevent measurement errors caused by wind blowing across the microphone the use of a windscreen is recommended The wind screen will reduce wind effects and will also help protect the microphone under dusty or oily conditions Acoustic attenuation effects of the WS 7 windscreen are shown in Figure 5 HCY RESPONSE ERROR ze PT 5 E s a5 3 FREQUENCY Figure 5 Effects of WS 7 056 652 Rev D 1100 2100 SLM models Technical 10 Operating and Measurements Information Chart Recording Datalogging Chart Recording Datalogging The model 1100 has a DC output that is linearly related to the decibel re
16. f Output J ack The model 1100 provides an output jack on the bottom of the meter for measuring the weighted AC signal before the rms log detector and the DC output of that detector This jack may be connected to any load without affecting the operation of the meter Connection to low impedance loads will require correction for the 1 Kohm impedance of this output and will also decrease battery life The output jack uses a 3 5mm stereo plug BE BUE AC QUT GROUND Figure 3 Output jack connections DC Output Function The Sound Pressure Level SPL over the range selected is linearly represented by a DC output The output changes 16 7mV dB or 1 V 60dB This output is primarily provided for connecting a 0 to 1 volt span data recorder AC Output Function This output provides the amplified weighted AC signal from the input of the RMS detector 056 652 Rev D 1100 2100 SLM models Battery 6 6 Checking the battery Calibrate Battery Check Checking the battery Battery Check At any time other than initial turn on if the LOBAT indicator on the display is activated the user must replace the battery A 9 volt Alkaline battery is recommended for best performance Refer to the label in battery compartment for battery replacement Battery Replacement Slide the battery door to the left to open the battery compartment and refer to the label inside the compartment for proper battery orientation Rechargeable Batteries
17. hone Cable 50 foot length The calibration level at 1 is affected by less than 0 1 dB with the insertion of either of these cables Therefore there is no need to recalibrate when the cable is attached m amp cH er TU MICROPHOM 140 EGUIWAL FAT PREARP TAGE Cv RMTI Figure 9 Frequency Amplitude limitations with extension cables Input Buffer Circuitry The high impedance input circuitry of the 1100 will accept up to a 2 0 volt RMS signal With the microphone and preamp removed other transducer devices may be connected to give a dB readout on the meter To remove the preamplifier unscrew the black plastic collar below the preamp housing Only use pins 1 and 3 for the AC signal input NEVER connect to pins 2 and 4 To input an electrical signal requires a special connector Quest part number 14 739 Figure 10 shows the function of each of the pins within the meter input connector SIGNAL INPUT SIGNAL GND SHIELD 2 oe C CDD NUT USE THIS VOLTAGE TO POWER ANY CIRCUITRY OTHER THAN THE QUEST PREAMP gt Figure 10 Input buffer circuitry 056 652 Rev D 1100 2100 SLM models 14 Technical Information Weighting Characteristics Weighting Characteristics The weighting characteristics frequency response for A and C are shown in Figure 11 The A weighting response emulates the low level response of the human ear and is used for most in
18. idity non condensing One 9 volt alkaline battery ANSI NEDA Type 1604A or IEC Type 6LR61 Typical Energizer 522 Quest 058 176 9 Volt Alkaline approximately 25 30 hours Negligible Negligible A threaded insert on back of the meter accepts a standard mounting screw 2100 2 8 x 7 6 x 1 3 inches including mic 1100 2 8 x 9 7 x 1 3 inches including mic 2100 10 3 oz 293 g including battery 1100 10 8 oz 306 g including battery 1100 2100 SLM models Accessories 18 Technical InformationAccessories Tone Burst Response Accessories 58 928 Calibrator Adapter for 0 52 inch diameter microphone for use with Quest CA series calibrators 56 990 Calibrator Adapter for 0 52 inch diameter microphone for use with Quest QC series calibrators 59 344 WS 7 Windscreen for 0 52 inch microphone pkg of 3 59 045 Tripod Larger 59 046 Tripod Smaller 59 703 Input Adapter Female BNC jack to 1 2 microphone thread with 18pF capacitance Allows direct electrical signal input to the meter 59 899 ICM 2 microphone cable 2 foot length 59 733 ICM 10 056 652 Rev D microphone cable 10 foot length 59 734 ICM 50 microphone cable 50 foot length 1100 2100 SLM models Service 6 19 Quest Service eene Contacting Quest Service Contacting Quest Technologies Should your Quest Technologies equipment need to be returned for repair or for recalibration please contact the service department at the followi
19. is as a command to exit calibration level set mode and exit without changing the calibration level To edit the level use the RESET key to increase the value and the CAL key to decrease the value Edit the value to match your calibrators output 4 When the desired calibration level is displayed press and hold both the RESET and CAL buttons until dashes appear on the display The new calibration level is now stored in the instrument s memory and will not have to be changed again unless an alternate calibrator is used Calibration The model 1100 may be calibrated in any range based on your calibrator s output There is no warm up period required but for maximum accuracy calibration of the model 1100 should be performed at the temperature of the environment to be measured To calibrate perform the following procedure using a Quest calibrator It is recommended that calibration be performed before each use Calibration 1 Checkto see that the LOB AT indicator is not on 2 Check to see that the calibrator SPL output matches the calibration level stored in the meter If it does not use procedure outlined in Changing the calibration level NOTE Failure to match calibrator output level to calibration level stored in the 1100 will result in erroneous SPL reading Turn calibrator ON If optional set the frequency to 1 KHz 4 Place the black adapter ring fully onto the microphone 5 Set the model 1100 to SPL SLO
20. lue To reset the value stored press and hold the RESET button for a few seconds then release This will erase the previous MAX value and display the current value prior to taking new readings For response times see Figures 7 and 8 F FAST S SLOW RESPONSE Switch The RESPONSE switch controls the rate at which the meter responds to changing input signals Most sound measurements are done with the response set to SLOW The FAST response is generally used when measuring short duration noises such as moving vehicles The RESPONSE switch positions are as follows e FAST 125 millisecond time constant See Figure 12 e SLOW 1 second time constant See Figure 13 056 652 Rev D 1100 2100 SLM models 4 Getting Started Meter Controls WEIGHTING A C Switch The WEIGHTING switch controls the frequency response of the meter Weightings A or C may be selected See Microphone preamplifier page 13 Weighting Characteristics for further information RANGE dB Switch The displayed range of the model 1100 is 70 dB and is switchable between 30 100 dB 50 120 dB and 70 140 dB After switching ranges allow several seconds for the meter electronics to stabilize RESET Button This button is primarily used to clear the MAX sound level when the instrument is in the MAX mode Pressing the RESET button for at least a half second will cause a reset of MAX If observation of the changing Sound Pressure Level is desired while in
21. ng number or access the online form via the website For technical issues please contact Technical Support Service Department and Technical Support 1 800 245 0779 Fax 1 262 567 4047 Office hours are 8 00 a m to 5 00 p m United States Central e E mail at quest mail mmm com e Internet at www quest technologies com International customers Contact your local factory authorized distributor from whom the product was purchased You can obtain the name and contact information of your local factory authorized distributor from Quest by using the e mail telephone or fax information given under Contacting Quest Technologies above Warranty Quest Technologies warrants our instruments to be free from defects in materials and workmanship for one year under normal conditions of use and service For United States customers we will replace or repair our option defective instruments at no charge excluding batteries abuse misuse alterations physical damage or instruments previously repaired by other than Quest Technologies Microphones sensors printers and chart recorders may have shorter or longer warranty periods This warranty states our total obligation in place of any other warranties expresses or implied Our warranty does not include any liability or obligation directly resulting from any defective instrument or product or any associated damages injuries or property loss including loss of use or measurement data For
22. o copy and distribute this manual provided that this Copyright Page is included This grant does not include permission to modify the manual s text or illustrations in any way This manual may not be translated without obtaining permission in advance Trademarks Quest Technologies the Quest logo and QuestSuite Professional Il are registered trademarks of Quest Technologies Incorporated All rights are reserved Microsoft and Windows are registered trademarks of Microsoft Inc Updates In the interests of continuous product improvements Quest Technologies reserves the right to make changes to product specifications without notice To understand the latest updates that have been implemented into this product and to download the most current version of this user manual visit our web site at www quest technologies com Copyright 2011 Quest Technologies a 3M company 056 652 Hev D 1100 2100 SLM models i Table of Contents Table of contents aligejo lToi o sr 1 1100 2100 MOUE Dc 1 Gening SIarted A 3 3 3 COPS 3 TE EASA SS SLOW RESPONSE SWITCH eerte es Ravi dba aas 3 Overload Detection and Underrange 5 QUIAE EM e Hmmm 5 DCOutput seem E ET D o o E 5 AG OUPO FONCION s secuit tiM coe cc cee Satna acide ei ecg eee 5 Checking battery E
23. ophone AC Output DC Output Detector Overload Indicator Temperature Accuracy Level Range Accuracy 056 652 Rev D 38 to 140 dBC 25 dBA 32 dBC typical and C Slow and Fast Removable 52 inch 13 5 mm diameter prepolarized condenser electret microphone Model 1100 Type 1 accuracy P N 059 523 BK 4936 Model 2100 2 accuracy P N 056 317 QE 7052 Approximately 0 1 V AC RMS 1000 ohm output impedance 3 5 mm stereo jack Approximately 0 1 V DC RMS Each 0 167V change equals 1 V 60dB 1000 ohm output impedance 3 5 mm stereo jack True RMS A sign in the display indicates overload Within 0 5dB at 23 C Within 1 0dB over the temperature range of 10 C to 50 0 5dB from 31 5 8000 Hz 1100 1 0dB from 20 12500 Hz 1100 0 7dB from 31 5 8000 Hz 2100 1100 2100 SLM models 17 Technical InformationSpecifications Tone Burst Response Crest Factor Operating Temperature Range Storage less batteries Operating Humidity Battery Battery Life Effect of Electromagnetic Fields Effect of Electrostatic Fields Tripod Mount 1 4 inch tripod Size Weight 056 652 Rev D Greater than 26dB crest factor 20 if peak of signal does not cause an overload Crest factor is sufficient to handle the signal if the overload indicator does not light 10 to 50 20 10 60 to 95 relative hum
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