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3M Quest 1200 and 2200 Integrating Sound Level

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1. E Figure 1b Model 1200R 2200R Remote 1200 2200 Sound Level Meter Operator Manual 2 General Overview 2 1 2 2 GENERAL OVERVIEW The Display The LCD display provides a numeric readout in 0 1dB increments along with a LOBAT low battery indicator The LOBAT indicator will turn on when the voltage of the battery is too low to allow an accurate reading A plus sign will appear on the left side of the display if signal peaks cause an overload condition in the electronics If the signal falls below the measuring range UR under range will be displayed Meter Controls 2 2 1 OFF PAUSE RUN Switch OFF In this position the power is removed from the instrument PAUSE In SPL mode the meter continuously displays sound pres sure level according to the RESPONSE and WEIGHTING settings In other modes the meter will display the appropriate value for the previ ous RUN or if no run time has been accumulated The meter automatically updates the current reading at a rate of once per second RUN Causes the meter to begin calculating the frequency weighted equivalent continuous SPL SPL measurements are inte grated into a single number representing the equivalent SPL for the entire measurement period This measurement will continue until the meter is placed in the PAUSE mode or reset Maximum RUN time is 100 hours or as long as the battery lasts 2 2 2 SPL LEQ
2. RANDOM INCIDENC 7 08 1k FREQUENCY Hz Figure 7 Typical microphone response Type 2 15 1200 2200 Sound Level Meter Operator s Manual Technical Information 5 3 Microphone Preamplifier Extension Cables On 1200R Remote units the preamplifier is removable by unscrewing the black plastic collar below the preamplifier housing The 1200 will drive up to a 10 foot cable with minimal loss Quest offers the following lengths of remote cable for use with the 1200 3159 899 ICM 2 Microphone Cable 2 foot length 3559 733 ICM 10 Microphone Cable 10 foot length 3559 734 ICM 50 Microphone Cable 50 foot lenght The calibration level at 1 KHz 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 2 il m e E 2 a z EQUIVALENT PREAMP OUTPUT VOLTAGE V RMS TO MICROPHONE 40 mv Pa 4k FREQUENCY Hz Figure 8 Frequency Amplitude Limitations with Extension Cables 5 4 Input Buffer Circuitry The high impedance input circuitry of the 1200 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
3. NEVER connect to pins 2 and 4 To input an electrical signal requires a special connector Quest part number 14 739 Figure 9 shows the function of each of the pins within the meter input connector SIGNAL INPUT N C SIGNAL GND SHIELD 5V lt DO NOT USE THIS LTAGE TO POWER ANY IRCUITRY OTHER THAN E QUEST PREAMP gt Figure 9 Meter Input Connector 1200 2200 Sound Level Meter Operator s Manual 16 Technical Information 5 5 Weighting Characteristics The weighting characteristics frequency response for A C and Z are shown in Figure 10 The A weighting response emulates the response of the human ear and is used for most industrial and community noise mea sure ments Generally C weighting is used for measuring noise reduction in hearing protectors and for other scientific purposes Z is linear response from 5 Hz to 20 kHz m o e z oO e m gt lt 1 74 50 100 200 500 1k 10k 20k 30k FREQUENCY Hz Figure 10 A C amp Z Weighting 5 6 Tone Burst Response Figures 11 12 and 13 show how the meter responds to a sinewave input of varied pulse duration for each response setting dB RELATIVE RESPONS fe 6 i a ee 20 50 100 200 500 1000 PULSE DURATION t MILLISECONDS Figure 11 Fast Respon
4. it is good practice to first set the meter to LEQ PAUSE change range and then set the meter to RUN This will avoid integrating any handling or switching noise into the LEQ measurement 2 2 6 RESET Button This button is used primarily to clear data from the memory of the instrument When pressed the display will begin to count down from 02 If the button is pressed and held the display will count down 02 01 When the dashes are displayed the instrument memory is clear This button is also used as an up arrow during setup see Operating Procedure 2 2 7 CAL Button This button has three functions It initiates a calibration toggles between Run Time displays and acts as a down arrow during setup see Operating Procedure 5 1200 2200 Sound Level Meter Operator s Manual General Overview 2 3 Output Jack The model 1200 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 Both signals are real time i e LEQ is not represented at the DC output 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 these outputs and will also decrease battery life The output jack takes a 3 5mm stereo plug See Figure 2 Output Jack Connections 2 3 1 DC Output Function The SPL or PEAK level over the range selec
5. it must be cleared before calibration is possible To do this press and hold the RESET button For more details see RESET Button section 2 2 6 7 Press and hold the CAL button until CAL appears in the display Release the button Three dashes will appear and then disappear one at a time as the meter calibrates A final message of PAS or BAD will appear in the display If BAD review steps one though five 3 3 1 Calibration Check It 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 in section 3 3 3 4 Switch Settings to Select Measurement To Measure SPL LEQ MAX HOLD Set Switches to SPL A C or Z RUN or PAUSE RESPONSE of interest LEQ A C or Z RUN RESPONSE of FAST SLOW OR IMPULSE MAX A C or Z RUN RESPONSE of interest Display 1 second update Holds LEQ until RESET or Meter SETTING is changed Holds MAX until RESET or Meter SETTING is changed 1200 2200 Sound Level Meter Operator s Manual Meter Integrity MIN HOLD MIN A C or Z Holds MIN until RESET RUN RESPONSE of or Meter SETTING is FAST SLOW OR changed IMPULSE During an LEQ RUN weighting response and range switch settings can not be changed If these switches are changed the LEQ measurement will stop reset and start again 1200
6. 2 SPL LEQ RT MAX MIN OL Switch UR 3 2 2 3 FAST SLOW PEAK IMP RESPONSE Switch 4 2 2 4 s 4 2 2 3 RANGE dB Switch 24 442 4 2 2 6 RESET Button u een 2 2 2 7 CAT Button apa o 5 2 3 Output Jack sense 5 2 4 1 DE Output Function u a 6 2 4 2 AC Output Function nennen 6 3 Meter Integerity oneri rt 7 3 1 Power On B ttery Check ocn asus 7 3 1 1 Battery Replacement ee eee 7 23 4 Bep cce ie REGE HR RT OG EP T Ee I EORR EE eee 7 3 2 1 Changing the Exchange Rate sene 7 3 2 2 Changing the Calibration Level eese 7 3 3 Calibration sioe een 8 3 3 4 Calibration Check e n teret He Po roe 8 3 4 Switch Settings to Select Measurements eee 9 4 c 10 4 1 Meter Microphone Placement sseen 10 4 2 Background NOISe i ias teneri n 10 4 3 Windscreen Effects u arena 11 4 4 Data Recording DATALOGGING eere 12 5 Technical Information soessersorenesnnesnessessnsonesnessensersnnennenuenens 13 3 1 Principles of Operation cea 13 9 2 Microphone uote eisernen 13 5 3 Weighting Char ceristiCS 2 uec tt eee ete ed ee 15 5 4 Tone Burst Response eet retten D eee ten 15 6 SPECH
7. 2200 Sound Level Meter Operator s Manual 10 Operation OPERATION Before taking measurements there is a series of quick checks that should be performed After switching the unit ON check for a LOBAT indication on the display and replace the battery if needed see Section 3 1 Although the model 1200 will maintain accurate calibration over a long period of time the calibration should be checked before each use The calibration should also be checked and verified after each use Set the RESPONSE WEIGHTING and RANGE dB switches as needed Hold set or tripod mount the meter in the desired location If a MAX MIN or LEQ measurement is needed be sure to reset the meter before taking the measurements It is good practice to document all measurement conditions and meter settings for possible future reference 4 1 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 cartridge used on the models 1200 and 2200 is a free field microphone Point it directly at the noise source 0 degrees Random incidence measurements may be taken with the 1200 if the plastic random incidence corrector supplied with the BK4936 microphone is used The random incidence corrector is a blac
8. For technical issues please contact Technical Support Service Department and Technical Support 1 800 245 0779 Fax 1 262 567 4047 Office hours 8 00 am to 5 00 pm US Central Email 3Mdetectionmail mmm com Website www 3M com detection International customers Contact your local factory authorized distributor from whom the product was purchased You may obtain the name and contact information of your local factory authorized distributor from 3M by using the email phone or fax information explained under 3M Customer Service Calibration The 1200 2200 SLM and 3M field calibrator devices should be examined regularly by the factory An annual calibration is recommended Please see Service Department above 23 1200 2200 Sound Level Meter Operator s Manual 3M WARRANTY 3M Warranty 3M 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 3M 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 expressed Our warranty does not include any liability or obligation directly resulting from any defective instrument or pro
9. RT MAX MIN OL Response Switch This six position switch determines the display mode of the meter e SPL In the SPL mode the numeric display provides a reading of the maximum sound pressure level measured during the previous second LEQ In the LEQ mode the display indicates the integrated or average level for the RUN period If no RUN time has been accumu lated the display shows dashes 1200 2200 Sound Level Meter Operator s Manual General Overview RT In the RT mode the display shows the elapsed time of the current or last RUN The RT mode consists of two or three displays The first is RUN TIME seconds XX The second is RUN TIME hours minutes XX XX Pressing the CAL button while in the RT mode toggles the meter between these two displays If the RUN TIME exceeds 20 hours there will be a third display that will show hours up to 99 h XX If no RUN time has been accumulated the display shows dashes MAX In the MAX mode the display holds the highest reading encountered during the RUN period If no RUN time has been accumulated the display shows dashes e MIN In the MIN mode the display holds the lowest reading encountered during the RUN period If no RUN time has been accumulated the display shows dashes OL In the OL mode the display shows the time that the circuitry has been overloaded as a percent of RUN TIME If no RUN time has been accumulated the display shows dashes on UR If a
10. or humid conditions Acoustic attenuation effects of the windscreen WS 7 are shown in Figure 4 o FREQUENCY RESPONSE ERROR CAUSED BY WINDSCREEN dB k 2k UENCY Hz Figure 4 Effects of Windscreen 1200 2200 Sound Level Meter Operator Manual 12 Operation 4 4 Data Recording The model 1200 has a DC output that is linearly related to the deciBel reading 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 chart recorder or data acquisition device that has a high input impedance The output impedance is 1000 ohms 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 recorder input impedances INPUT IMPEDANCE MULTIPLY DC VOLTAGE OF RECORDER BY 10 KOHM 20 KOHM 50 KOHM 100 KOHM 13 1200 2200 Sound Level Meter Operator s Manual Technical Information 5 TECHNICAL INFORMATION 5 1 Principles of Operation The Quest model 1200 uses low noise low power analog and digital integrated circuirty to ensure long battery life maximum stability and superior reliability over a wide range of environmental conditions Figure 5 is a block diagram of the model 1200 2200 s internal circuit operations MICROPHONE WEIGHTING FO PREAMP oN FILTER 7 LINEAR FAST R
11. 3M Personal Safety Division 1200 2200 Sound Level Meter Models nu y Functionality e 1200 2200 SLM User Manual Introduction The 1200 Sound Level Meter is a light weight easy to use Type 1 instrument and the 2200 is the Type 2 model The purpose of this manual is to provide the user with the necessary information to operate the 1200 2200 Sound Level Meter as well as the remoteable versions of the 1200R 2200R The entire manual should be read to fully understand the many features this instrument offers This manual is not all inclusive and cannot cover all unique situations In addition no warranties are contained in this manual except as described under the warranty policy section Note Due to the 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 Table of Contents 1 Introduction sssersorsnssnseseennesnnennesnesossonsnnennensnensersnsonssnensersonnnennen 1 2 Genveral OVEEFVI W a nee 2 2 1 The Display ue nre o rep ert arietes 2 2 2 Meter Controls sn ee san 3 2 2 1 OFE PAUSE RUN Switch 5 3 2 2
12. 40 years of safety leadership recognizing the company s respiratory and hearing protection solutions introduced in 1972 Visit www 3M com PPESafety or http m 3m com PPESafety for details M Personal Safety Division 3M Detection Solutions ISO 9001 Registered Company ISO 17025 Accredited Calibration Lab www 3M com detection 1060 Corporate Center Drive Please recycle Printed in USA Oconomowoc WI 53066 2013 3M Customer Service 262 567 9157 All rights reserved Toll Free 800 245 0779 056 653 Rev G 2 13
13. ICALIONS M 18 E 0 21 8 3M Customer Service sissssssscsesvssessssesosssssesssissssassssesesussssocsdscsssese 22 Warranty e 23 1200 2200 Sound Level Meter Operator s Manual i Introduction 1 INTRODUCTION The 3M Quest models 1200 and 2200 and their remote versions 1200R 2200R are Impulse and Integrating Sound Level Meters for measuring frequency weighted and time averaged SPL weighted or unweighted Peaks or frequency weighted Leq Applications include laboratory industrial community and military measurement or analysis The models 1200 and 2200 are easy to use hand held meters with an LCD display that provides a numerical readout They are housed in an R F shielded injection molded case The meter is operated with simple slide switches An output jack on the bottom of the meter is provided for con necting to peripheral devices such as chart recorders oscilloscopes audio recorders etc The model 1200 provides Type 1 accuracy for precision measurements while the model 2200 provides Type 2 accuracy for general field survey work As both meters are operationally identical this manual will refer only to the model 1200 except where appropriate Figure 1a Model 1200 2200 1 1200 2200 Sound Level Meter Operator s Manual Introduction OPTIONAL REMOTE CABLE
14. MS LOG SLOW PEAK CONVERSION IMPULSE O LCD MICROPROCESSOR DISPLAY 4 CONVERTER Figure 5 1200 2200 Block Diagram 5 2 Microphone The model 1200 is designed to accept a prepolarized electret microphone Quest P N 059 523 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 2 microphone is shown in Figure 6 The model 2200 is designed to accept a prepolarized electret Type 2 microphone Quest P N 056 316 QE7052 The impedance of this micro phone is approximately 15pF 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 7 1200 2200 Sound Level Meter Operator s Manual 14 Technical Information 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 RANDOM INCIDENCE 70 ELECTROSTATIC CTUATOR METHOD PRESSURE Tk 2k FREQUENCY Hz Figure 6 Typical microphone response Type 1
15. duct or any associated damages injuries or property loss including loss of use or measurement data For 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 3M distributor or our 3M European Service Laboratory Foreign purchasers should contact the local 3M authorized sales agent for detail 1200 2200 Sound Level Meter Operator s Manual 24 About Us 3M Detection Solutions is a world class manufacturer of rugged reliable instrumentation and software systems that help monitor and evaluate occupational and environmental health and safety hazards including noise dosimetry sound level monitoring heat stress indoor air quality and select toxic combustible gases The 3M Detection brand of instrumentation is used by safety and industrial hygiene professionals to help comply with applicable occupational standards and regulations About 3M Personal Safety 3M offers a comprehensive diverse portfolio of Personal Safety solutions providing respiratory protection hearing protection fall protection reflective materials for high visibility protective clothing protective eyewear head and face protection welding helmets and other adjacent products and solutions such as tactical safety equipment detection monitoring equipment active communications equipment and compliance management In 2012 3M celebrated
16. gible One 9 volt alkaline battery ANSI NEDA Type 1604A or Type 6LR61 Typical Energizer 522 Quest 058 176 1200 2200 Sound Level Meter Operator Manual 20 Specifications Battery Life Size Weight 21 9 Volt Alkaline approximately 25 hours 9 Volt NICAD approximately 8 hours 2200 2 8 x 7 6 x 1 3 inches including mic 1200 2 8 x 9 7 x 1 3 inches including mic 2200 10 3 oz 293 g including battery 1200 10 8 oz 306 g including battery 1200 2200 Sound Level Meter Operator s Manual Accessories 7 ACCESSORIES 56 990 58 928 59 344 59 45 59 46 59 703 59 899 59 733 59 734 Calibrator Adapter for 0 50 inch diameter microphone for Quest QC series calibrators Calibrator Adapter for 0 50 inch diameter microphone for Quest CA series calibrators WS 7 Windscreen for 0 50 inch microphone pkg of 3 Tripod Larger Tripod Smaller Input Adapter Female BNC jack to 1 2 microphone thread with 18pF capacitance Allows direct electrical signal input to the meter ICM 2 microphone cable 2 foot length ICM 10 microphone cable 10 foot length ICM 50 microphone cable 50 foot length 1200 2200 Sound Level Meter Operator s Manual 22 Customer Service 3M Customer Service Should your 3M Quest equipment need to be returned for repair or for recalibration please contact the service department at the following number or access the online form via the website
17. k 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 mircophone and gently press down until a snap fit is achieved 4 2 Background Noise Background noise can cause considerable error in measurement when its level is close to that of the particular sound source of interest When it is not possible to eliminate or reduce the background noise use the curve shown in Figure 3 to correct for the effect of the background noise on the measurement 1200 2200 Sound Level Meter Operator s Manual Operation For example if the background noise is 454 and the sound of interest measures 51dB the difference between measurement and background noise is 6dB From Figure 3 for a 6dB difference 1 3dB should be subtracted from the measurement The correct measurement is therefore 51dB 1 3dB 49 7dB Gd a 2 5 o Ww a E Q lt pE ta 5D ta o a c o c UU 1 2 3 4 5 6 7 8 dB DIFFERENCE BETWEEN MEASUREMENT AND BACKGROUND NOISE Figure 3 Effects of Backgound Noise 4 3 Wind Screen Effects To prevent measurement errors caused by wind blowing across the micro phone the use of a windscreen is recommended The wind screen will reduce wind effects and will also help protect the microphone under dusty oily
18. n Under Range indicator designated as a minus symbol appears on the display then this indicates the Sound Pressure level is below the measuring range set on the Sound Level Meter 2 2 3 FAST SLOW PEAK IMP 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 S The FAST F response is generally used when measuring short duration noises such as moving vehicles PEAK P is useful when measuring the absolute peak of the sound pressure wave IMPULSE J is used for impulsive or transient sounds The Response switch positions are as follows e FAST F 125 millisecond time constant See Figure 10 Decay Rate 34 7 dB per second e SLOW S 1 second time constant See Figure 11 Decay Rate 4 35 dB per second PEAK P 50 microsecond time constant e IMPULSE I 35 millisecond rise time constant 1 5 second decay time constant See Figure 12 1200 2200 Sound Level Meter Operator s Manual 4 General Overview 2 2 4 A C Z Switch The A C Z switch controls the frequency response weighting of all measurements See Figure 9 2 2 5 RANGE dB Switch The displayed range of the model 1200 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 If a range change is necessary during a LEQ study
19. of the typical NiMH cell prior to the voltage dropping low enough to activate the LOBAT indicator Setup NOTE There may be times when it is necessary to change the Exchange Rate or Calibration Level that is stored in the meter Both of these items are accessible during the power up sequence The power up sequence is as follows 1 All display segments turned on for 2 seconds 2 The meter firmware revision for 2 seconds 3 The current Exchange Rate or Doubling Rate Er3 or Er5 for 3 seconds 4 The current Calibration Level for 3 seconds 32 1 Changing the Exchange Rate Turn on the meter When Er3 or Er5 appears in the display press both the CAL and RESET button simultaneously until dashes are displayed 1200 2200 Sound Level Meter Operator s Manual 3 3 Meter Integrity At this point pressing either the CAL or RESET button will toggle the Exchange Rate between Er3 and Er5 When the desired Exchange Rate is displayed store the selection by pressing both the CAL and RESET buttons simultaneously This com pletes the selection 3 2 2 Changing the Calibration Level NOTE The calibration level is the decibel level that is produced by your calibrator Turn on the meter When the current calibration level is displayed press and hold both the RESET and CAL buttons until dashes appear The meter is now in the calibration level set mode To edit the level use the RESET key to increa
20. se 17 1200 2200 Sound Level Meter Operator s Manual Technical Information RELATIVE RESPONSE dB 0 2 0 5 PULSE DURATIO N EN RELATIVE RESPONSE dB o 5 0 50 100 RATION t MILLISECONDS N Figure 13 Impulse Response Nominal decay times for each time response setting are as follows FAST 34 7 dB per second SLOW 4 35 dB per second IMPULSE 2 9 dB per second PEAK measurements have a rise time constant of 50uS The dis played value is the highest peak occurring prior to a reset Resets occur every second in PAUSE When the meter is in RUN a manual reset is required 1200 2200 Sound Level Meter Operator s Manual 18 Specifications SPECIFICATIONS Standards Display Modes of Operation Linear Operating Range Pulse Range Electrical Noise Floor Frequency Weighting Networks Meter Repsonse Microphone AC Output DC Output Model 1200 Type 1 Model 2200 Type 2 ANSI S1 43 1997 ANSI s1 4 1983 R 1997 IEC 651 1979 IEC 804 1985 3 1 2 Digit Liquid Crystal Display Level display indicates to 0 1 dB resolution An enunciator is included for Battery Check Measures sound pressure level SPL maximum level MAX minimum level MIN and equivalent continu ous sound pressure level LEQ 34 to 140 dBA SPL 43
21. se the value and the CAL key to decrease to value Edit the value to match your calibrator s output 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 instruments memory and will not have to be changed again unless an alternate calibrator is used Calibration The model 1200 may be calibrated in any range based on your calibrator s output There is no warm up period required but for maximum accuracy calibration 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 1 Check that the LOBAT 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 section 3 2 NOTE Failure to match calibrator output level to calibration level stored in the 1200 will result in erroneous SPL readings 1200 2200 Sound Level Meter Operator s Manual 8 Meter Integrity 3 Turn to calibrator ON If optional set the frequency to 1 KHz 4 Place the black adapter ring fully onto the microphone 5 Setthe model 1200 to SPL PAUSE SLOW or FAST and A or C weighting Set the measuring range so that the calibration level falls within it 6 Ifthe 1200 has data in the memory
22. ted is linearly represented by a DC output The output changes 16 7mV dB or 1V 60dB This output is provided for connecting a 0 to 1 volt span data recorder See section 4 4 Data Recording 2 3 2 AC Output Function This jack provides the amplified frequency weighted AC signal at the input of the RMS detector vv 70 DC OUT AC OUT GROUND Figure 2 Output Jack Connections 1200 2200 Sound Level Meter Operator s Manual 6 Meter Integrity 3 1 32 METER INTEGRITY Power On and Battery Check Set the OFF PAUSE RUN switch to either the PAUSE or RUN position as desired At any time other than initial turn on if the LOBAT indicator is displayed the user must replace the battery A 9 Volt Alkaline battery is recommended for best performance 3 1 1 Battery Replacement Slide the battery door to the left to open the battery compartment Refer to the sticker inside the compartment for proper battery orientation 3 1 2 Rechargeable Batteries Nicad type rechargeable 9V batteries such as Radio Shack 23 299 7 2 V 120 mAh and an appropriate charger may be used with the 1200 The fact that nicad 9 V replacement cells typically operate at 7 2 V will be Observed as shorter battery life approximatelt 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
23. to 143 dBA PEAK 37 to 140 dBC SPL 43 to 143 dBC PEAK 42 to 140 dBZ SPL 43 to 143 dBZ PEAK 63 dB 26 dBA typ 30dBC typ 35 dBZ typ A and Z Fast Slow Impulse or Peak 50uS rise time constant Removable 52 inch 13 5mm prepolarized condenser electret microphone Model 1200 Type 1 accuracy P N 059 523 BK 4936 Model 2200 Type 2 accuracy P N 056 317 QE 7052 Approximately 0 1 Volt AC RMS Kohm output impedance 3 5 mm stereo jack Approximately 0 1 Volt DC Each 0 167V change equals 10dB 1V 60dB Kohm output impedance 3 5 mm stereo jackLinear 1200 2200 Sound Level Meter Operator s Manual Detector Integration Time Overload Indication Accuracy Level Range Accuracy Temperature Range Storage less batteries Operating Humidity Effect of Electromagnetic Fields Effect of Electrostatic Fields Battery Specifications True RMS Signal Dependent approximately 2 5 hours at a constant 140dB SPL Time will double with each 3dB decrease in average SPL until limited by battery life sign in the display indicates overload during Leq measurement Within 0 5 dB at 23 C Within 1 0 dB over the temperature range of 10 C to 50 C 0 5dB from 31 5 8000 Hz 1200 1 0dB from 20 12500 Hz 1200 0 7dB from 31 5 8000 Hz 2200 Operation 10 C to 50 C 20 C to 60 C 0 to 95 relative humidity non condensing Negligible Negli

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