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Quest 2900

1. 2 m o o dV Net 2 zt o n 4 n 6 gt 8 3 0 10 212 11 TESTER T Lori 1 2 5 0 20 50 PULSE DURATION t MILLISECONDS IMPULSE Response 100 9d 7 SPECIFICATIONS Standards Model 1900 Type 1 Model 2900 Type 2 ANSI 51 4 1983 651 1979 804 1985 Measurement Range 20 140dB in 7 60dB ranges with standard microphone Model 1900 only display range may be shifted upward in 10dB steps to 60 180dB by using optional microphones The second peak detector operates over the range of 40 to 10 relative to the top of the selected measurement range Display 4 Digit Liquid Crystal Display with an additional Quasi Analog 60 dB indicator in 2 dB increments Level display indicates to 0 1 dB resolution Time display indicates either Min Sec or Hr Min Annunciators are included for Battery Check RUN Pause and Overload Indication Measurements Performed Sound Pressure Level SPL Equivalent Level LEO or LAVG Time Weighted Average TWA Maximum Level LMAX Minimum Level LMIN Percentile Levels LN Day Night Level LDN Community Noise Exposure Level CNEL Overload Time 01 Exposure Sound Exposure Level SEL Taktmaximal TAKM and Run Time RTxx Optional C A module allows simultaneous C A weighted measurement of LEQ or LAVG Automatic Measurement Modes Programmed Run Duration Level Triggered
2. Figure 11 Parameter Setup Menu CAL Calibration Value Stores calibration value for SPL and peak detector SPL calibration value and time and date of calibration will appear on the printout The instrument s range settings may be adjusted to compensate for microphones that differ in sensitivity from the standard mics Refer to section 5 1 Calibration for details 2PK Select Weighting of Second Peak Detector A C LIN used for LPK display or for logging data 3 or 5 second L4 for Taktmaximal measurements SESS Session mode ON or OFF combines consecutive studies into a cumulative summary See section 3 2 for details there is data in memory this cannot be changed without first resetting the unit The user cycles through these parameters by pressing the keys Pressing the EDIT RESET key allows the user to change the values or enable disable the parameter When setting numeric values the bargraph sections above the quantity to be changed will be lit The and E keys are used to change numeric values Pressing ENTER stores the value Pressing ENTER again returns to the PARA display Typical Setups OSHA NOISE COMPLIANCE Threshold 90dB Weighting Exchange Rate 5dB A Response Slow OSHA HEARING CONSERVATION Same as above except with Threshold 80dB DEPARTMENT OF DEFENSE NOISE COMPLIANCE Threshold 80dB Exchange Rate 4dB Weig
3. 1 o o ta 5 1 a a z B a 2 z 2 lt lt 1 o 01 015 02 04 06 08 2 FREQUENCY RATIO f f Figure 31 Typical OB 100 Filter Response 69 13 SPECIFICATIONS OB 100 Standards ANSI 3S1 11 1986 Order 3 Type 2 Sub type C and IEC R225 1966 Center Frequencies 10 frequencies from 31 5 Hz to 16 kHz Frequency Selection Full manual control or automatic sequential stepping through each frequency Power Source Sound Level Meter Size 3 3 x 2 8 x 1 8 inches 84 x 71 x 47mm Weight 6 ounces 170 grams 14 TECHNICAL INFORMATION OB 300 The OB 300 conforms to ANSI 51 11 1986 Order 3 Type 2 Sub type C and R225 1966 The normalized passband characteristics of both the 1 1 and 3 filter responses are depicted in Figure 32 The 1 1 filters are flat within 0 5 dB in the passband with the 3 dB down points at approximately 0 707 fc and 1 414 fc where fc is the center frequency of the band chosen The fc 2 and 2fc frequencies are down by approximately 21 dB with the decade points fc 10 and 10fc down by greater than 70 dB The 1 3 filters are flat within 0 3 dB in the passband with the 3 dB down points at approximately 0 89 fc and 1 12 fc where fc is the center frequency of the band chosen The fc 2 and 2fc frequencies are down by approximately 50 dB The block diagram of the OB 300 is shown in Figure 33 1
4. 40 10088 RANGE 80 140dB RANGE 10098 14098 9048 13098 80dB 120dB 7048 94dB CALIBRATION POINT 110dB 60dB 100dB 50dB ZERO THE POINTER AT 40 OR 80 40dB 90 8 1 VDC SPAN Figure 13 Chart Recording of SPL 43 5 GENERAL SOUND MEASUREMENT PRACTICES Before taking measurements with the Model 1900 there is a series of quick checks that should be performed After switching the unit ON check for the BAT indicator in the display Replace the batteries if needed Although the Model 1900 will maintain accurate calibration over a long period of time the calibration should be checked and the meter slightly adjusted if necessary before each use When performing integrating measurements press the RUN PAUSE key making sure is indicated in the display If the meter is in the RUN mode and you want to change Weighting Response or Range it is a good idea to stop accumulating data by entering the Pause mode This will eliminate electrical switching noise from affecting your study especially when using SLOW or IMPULSE response do this press the RUN PAUSE key again and will disappear fro
5. Octave Band All Pass 27dB 36dB 45dB 31 5 and 63 l6dB 31dB 33dB 125 and 250 l6dB 26dB 26dB 500 and 1K 18dB 20dB 20dB 2K and 4K l6dB l6dB l6dB 8K and 16K l6dB l6dB l6dB Values for the model 2900 s QE7052 Type 2 microphone will be approximately 2 dB higher than those for the 0 4146 6 9 Tone Burst Response Figures 25 through 29 show the meter s tone burst response to sinewave inputs of varied burst duration The four available time constants are SLOW RESPONSE 1000 msec time constant Figure 25 Decay Rate 4 35 dB per second E FAST RESPONS ca 125 msec time constant Figure 26 Decay Rate 34 7 dB per second PEAK RESPONSE 50 microsecond time constant Figure 27 E IMPULSE RESPONSE 35 msec rise time constant with a decay rate of 2 9 dB sec Figures 28 and 29 2 d V Vet RELATIVE RESPONSE dB 12 L 1 41 id 0 1 0 2 0 5 2 5 10 PULSE DURATION t SECONDS Figure 25 SLOW Response 55 Figure 27 PEAK Response 56 Figure 26 2 T 0 UO d V Ner 2 2 o 4 2 6 gt 8 10 12 1 1 1 L 11 11 10 20 50 100 200 500 1000 PULSE DURATION t MILLISECONDS FAST Response Figure 29 IMPULSE Response to Repeated Impulses PULSE REPETITION ced Figure 28
6. instructions for Models 1900 and 2900 Integrating and Logging Sound Level Meter 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 56 352 Rev 1 98 1 2 3 4 TABLE OF CONTENTS MODELS 1900 2900 SOUND LEVEL METER WITH THE OB 100 0B 300 INTRODUCTION TO THE MODELS 1900 2900 1 1 Assembling the Meter Microphone Handling and Storage 1 2 Initial Turn On and Check ABOUT THE METER 2 1 The Display 2 2 Keypad Functions 2 3 Output Jacks OPERATING PROCEDURE 3 1 Measured Quantities Acoustic Study File Creation 3 x Session Mode Viewing Measured Results 3 2 Reviewing Memory Locations Memory Capacity Erasing Stored Data 3 3 Setup Menus DISP Setup Menu LOG Setup Menu PRNT Setup Menu COMM Setup Menu PARA Setup Menu Typical Setups 4 Overload Detection 3 5 Battery Replacement 6 C A Measurements Second RMS Option COMMUNICATIONS 4 1 RS 232 Serial Interface 4 2 Downloading Data 4 3 Remote Control and Data Collection ASCII Commands 4 4 Pr
7. 3552 zo EZ gg 5 55 5 33 ae a pus 35 5 oU oe z 22 gt DFO eoZza 5 2 Se 5 5588 a au An 265 lt 400 i QU Figure 6 Manual and Automatic Study Options T3 14 File Creation Grouping Studies It may be desirable to separate a group of studies into a File For example if several studies were performed at a single site using various weightings response times or filters you might wish to separate the printout of these studies from that of a similar group of studies performed at a different site Grouping consecutive studies into a File accomplishes this File is created after performing the last study to be grouped and prior to beginning the first study of the next group To create a File press MEMORY while in Pause mode FILE will appear in the display Press ENTER This will group all studies performed since the last File was created into a new File When printing data each File will have a Header section to separate it from the previous File Refer to Figure 7 File creation is not available if the meter is set to run in session mode Refer to the next section Session Mode Combined Studies To obtain a cumulative measurement of consecutive studies which must have identical measurement parameters enable Session mode in the Parameters Setup Menu The meter must first have its memory cleared by performing a RESET A Session consists of individual
8. Threshold Trigger ON level Sets Threshold triggered study termination level this is overridden if Programmed Run Time Duration is enabled RTHM or RTMS Programmed Run Time Duration in Hours Minutes or Minutes Seconds set hours minutes seconds or turn off Sets study length for manual threshold or Auto On initiated study 99 hour 59 minute 59 second maximum Setting to 00 00 00 will default to OFF AOMD AOHM or AOMS Auto On Time in Month Day Hours Minu tes E Minut es Se conds Set Month Day Time r turn off Sets time t autom atica 11 turn unit and begin study 24 hour milit ary time forma t as used for Hours Minu tes YEAR MODY or HRMN Clock Calendar Set year month day hours minutes 24 hour military time format is used 27 28 D EXCHANGE RATE INTEGRATION THRESHOLD EXCEEDANCE LEVELS STUDY TRIGGER THRESHOLDS LN1 LN2 LN3 LN4 TON TOFF RT MS RT HM AO MS AO MD A0 HM 4 XX 0dB 0dB OFF SG SET VALUE LXXX 4 122 ou N SET VALUE PRNT PARA gt COMM pise FUNCTION PROG RUN TIME DURATION AUTO ON TIME XX VALUE STORED VALUE MAY BE CHANGED CLOCK CALENDAR CALIBRATION PEAK WEIGHTING TAKTMAXIMAL PERIOD SESSION MODE SESS Co
9. m 901 OL Nd ALLLNWNO 031 318vl 1915 1 15 Figure 9 Log Setup Menu 23 PRNT Setup Menu Data to be printed Refer to Figure 10 After pressing SETUP the E or E arrow keys may be pressed until PRNT is displayed The data presentation for the printout may be selected in the Print setup menu Pressing ENTER gets you into the menu and will for example display Onr You may now choose whether or not the header is included in the printout Pressing EDIT RESET toggles between and OFF pp Pressing FUNCTION cycles to the next selection ong which is turned on or off in the same way The printout options are HEDR Header on or off SUMR Summary of all measurements on or off THIS Numeric Time History on or off FILT Filter Data Grouping on or off Data collected using an optional bandpass filter may be grouped under a common header ON or printed as an individual study OFF P 40 Compressed print mode This will fit the printout onto a small 40 column printer LOC Print individual memory locations along with session data Session mode only A sample printout is shown in Section 4 4 Printing Data COMM Setup Menu Communications parameters Refer to Figure 10 While in SETUP press the FUNCTION key to display COMM Press ENTER to access the Communications Setup Menu where the following selections involving data communications are made BAUD Baud Rate Choice of
10. Review mode only the data stored in i N Measuring Parameters the memory location selected will print If in Session mode and Range 40 110dB Weighting A Time Constant Slow the overall Session summary data is selected for viewing that Threshold Exchange Rates 398 Peak Weighting TUN summary data will print out The data for the individual studies Started o f Run Time will print if selected in the Print Setup menu by turning on the Peak Level 102 6dB 18 JAN 94 10 56 42 31 1 i M L 1 88 0dB 15 JAN 94 10 56 43 LOC or memory location option Min evel 73 4dB 15 JAN 94 10 57 12 Overload 0 0 2 If the meter is in normal Pause mode all studies stored will LEQ 80 5dB SEL 3 115 1dB TWA 41 0dB 2 0 5 1 i i 1 i LDN 82 6dB CNEL 83 5dB TAKM3 81 6dB print Studies that were made using an optional bandpass filter Ed 33 208 TADE will print according to the selection made at the FILT option in the PRNT Setup Menu To interrupt a printout press PRINT again Disconnect the interface from the printer before turning the model 1900 off 39 40 SAMPLE PRINTOUT continued GROUPED FILTER DATA SECTION Measuring Parameters Range Filter 2 3 4 6 T 8 9 10 1 LOGGING Study 1 10 56 10 56 10 56 10 56 10 56 10 56 10 56 10 56 70 110dB Weighting LIN Time Constant Threshold OFF Exchange Rate Peak Weighting Summary Mode
11. bits 1 parity none flow control must match the 1900 To save the downloaded data to a file use the following procedure After the communication settings are made p Select TRANSFERS then select RECEIVE TEXT FILE 2 Enter a file name with the ending TXT St Press the PRINT key on the 1900 PRN will appear in the 1900 s display 4 When complete PRN will disappear from the 1900 s display Select TANSFERS then STOP in the TERMINAL program Ds Exit TERMINAL 6 The file has been saved and can be opened with a word processor or editor such as Windows NOTEPAD Remember which directory the file was saved in The default for Terminal is the WINDOWS directory 4 3 Remote Control and Data Collection Serial communications options for the model 1900 depend upon the operating mode of the instrument Certain functions are available depending upon whether the unit is in RUN or PAUSE mode or whether or not logging to the COMM port has been selected While in PAUSE any function available by a front panel key press except MEMORY may be duplicated via an ASCII commmand A data request command will provide the same data that would be presented on the display if the FUNCTION key were pressed to select that display For example requesting LEQ would result in receiving the LEQ from the previous study Requesting SPL would result in a single reply of the current 1 second MAX SPL 34 While in RUN and if logging
12. display will freeze and the keypad will be inoperative Properly connecting the serial cable between the meter and the other device will restore normal operation On units with software revision 1 3 and higher If the above condition exists the meter will automatically change the flow control option to NONE preventing an apparent lockup condition The flow control option may need to be reset prior to using the COMM port for serial communications 35 ASCII Commands The following is a list of commands used to control the model 1900 via RS 232 36 Data Request Commands Returns the current value plus OL if an overload has occured during the study If in session mode session data will be returned If an R is included where an asterisk is shown the current Run Time will also be returned Do NOT include the in the command string SPL LEOx x 1 or blank Returns current LEQ or LAVG The 1 will return the C weighted value if the C A board is installed and enabled LAVGx x 1 or blank see above Returns current or LAVG TWA LMAX returns the value of LMAX and the time that it occurred LMIN returns the value of LMIN and the time that it occurred LNx 1 2 3 4 Returns the selected Lxx value LDN CNEL SOL PA2H returns the value of Exposure in Pa2S or Pa2H SEL RT returns elapsed study run time HH MM SS LPK returns the value of LPK and the time that it occurred LLOG returns t
13. filters should not be used while performing measurements Also PEAK response is not available 2 The Response must be set to FAST SLOW or IMPULSE PEAK response is not allowed otherwise the display will show Note that battery current is increased when the C A measurment is enabled To prolong battery life do not enable C A unnecessarily 31 4 COMMUNICATIONS DEFINITIONS PARALLEL MODE Data is passed along multiple wires simultaneously This is used for sending information to parallel printers SERIAL MODE 11 of the data is passed along a single wire in a serial stream This mode is used when sending information to a computer or serial printers RS 232 is a type of serial mode communication BAUD RATE Baud rate is the speed at which serial communications take place measured in bits per second The baud rate options for the model 1900 are 300 600 1200 2400 4800 9600 and 19 200 The higher the baud rate the faster the communication When trying to pass information from an instrument to a computer or serial printer both must be set for the same baud rate Baud rate settings have no affect on parallel printing COM PORT Abbreviated name for a serial communications port on a computer also called RS232 port Most PCs have between 1 and 4 serial ports referred to as COMI COM2 etc This is where the cable from the meter connects to the PC The COM ports generally will take the form of ei
14. is greater than 1 gigaohm in parallel with 47 pF Polarization 1900 only Regulated 200V DC 2 for use with condenser microphones The voltage must be manually switched when using prepolarized condenser electret microphones Meter Input The input impedance is 1 Megohm in series with 0 1uF Model 1900 Maximum sinusoidal input voltage 10V RMS Model 2900 Maximum sinusoidal input voltage 4V RMS AC Output 3 16 V RMS at full scale 60 dB 3 8 V RMS maximum output impedance is 3 2K ohms Connected equipment sho have an input impedance of 10K ohms The output can shorted without damaging the meter or changing the me reading DC Output 0 to 1 00V DC 60 dB span Each 0 167V change equals 10 dB Output impedance is 1000 ohms Connec equipment should have an input impedance of 10K ohms of off The uld be ter ted The output can be shorted without damaging the meter or changing the meter reading COMM Output RS 232 serial output to printers or computers Selectable data rates format Parallel print outp wc t er ut h optional interface 59 module Frequency Range 4 Hz 3dB to 50 kHz 3dB on linear weighting meter only Subject to microphone limitations Reference Range 60 to 120 dB Range setting Reference SPL 114 dB Reference Frequency 1 kHz 60 Reference Direction 0 Degree when using a Free Field Microphone Sound is arriving from directl
15. is the only COM port then the mouse must be disconnected and the PC possibly must be reconfigured 4 2 Downloading Data Data stored in the model 1900 may be downloaded to a personal computer Several methods are available The Quest Sound Manager software package provides an easy method of receiving data from the meter Data presentation options include tabular or graphical form In addition remote control and access to all operating parameters is possible via an easy to use menu driven interface By using the RS 232 port on a PC and a communications package such as Procomm or Windows Terminal the printout from the meter may be received and Stored as a file The 1900 must be set for serial operation and the settings Baud rate etc must match that of the PC The serial communications cable must be connected between the meter and the PC Pressing the PRINT key will cause the meter to print to the PC 33 Downloading Using Windows TERMINAL Microsoft Windows has a communications program under the ACCESSORIES icon called TERMINAL Instructions on how to use TERMINAL are located in the Windows manuals Open TERMINAL For TERMINAL the communications settings are found by first selecting SETTINGS then COMMUNICATIONS Select the desired COM serial port and the baud rate The baud rate must match the BAUD selected in the 1900 s COMM Setup Menu TERMINAL also needs the following information in its setup data bits 8 stop
16. o o MODEL 1900 ONLY GAIN MIC GAIN WEIGHTING AC OUTPUT 1088 STEPS X ADJUST m NETWORK BUFFER EXTERNAL BANDPASS OVERLOAD FILTER OPTIONAL RMS CONVERSION KEYPAD DC OUTPUT 200V V V BUFFER HIGH VOLTAGE T SUPPLIES pea nuns e 6 5V 5V DIGITAL OUT 6 5V 6 5V 5V REGULATED gt 5v EP SUPPLIES 5v 9V_ 9V ON OFF MICROPROCESSOR EESTI A 55 T L BATTERY ISPLAY TEST CIRCUIT DRIVER CIRCUITRY Figure 16 Block Diagram of the Model 1900 6 2 Microphones Model 1900 48 The Model 1900 is normally supplied with a 0 52 microphone of either the free field or random incidence pressure type Either prepolarized electret or condenser types may be used The electret microphone does not require the 200 volt polarization that can be supplied by the model 1900 Refer to section 1 1 The microphone screws directly onto the preamplifier which in turn connects directly to the meter The preamplifier converts the high output impedance of the microphone into a low output impedance allowing the microphone to drive up to 100 feet of cable for remote operation Typical microphones used with the 1900 include the following QE4146 1 2 inch freefield prepolarized 39 8 mv Pa 25 145dB QE4170 l inch pressure 200V polarized 50 mv Pa 10 150dB QE4160 1 2 inch pressure 200V polarized 50 mv Pa 20 145dB QE4150 1 2 inch free
17. of the meter There are many quantities that may be displayed logged or printed and most users will not be interested in all of them SETUP allows the user to select only the items of interest for example SPL LAV and L10 excluding all others The five menus are COMM Communications Parameters PARA Measurement Parameters PRNT Data to be Printed LOG Data to be Logged DISP Data to be Displayed Refer to section 3 3 for details on meter SETUP This key is used to group studies stored in memory into a File for printout and to review individual studies stored in memory While in PAUSE press MEMORY to display FILE Press ENTER to group the previously stored studies into a File Pressing FUNCTION or E causes XX to be displayed where XX is the number of the last study as in memory LOCation Press ENTER to display a measured quantity such as LAV The FUNCTION key may be used to display other quantities LMAX SEL etc Press ENTER again to return to the display The function key may be used to increment or decrement memory locations If incrementing past the last location the display will read 1 LOC or the first study If 10 000 or more studies have been performed the display will read XXXX4 Press MEMORY again to exit study review Refer to section 3 2 for more details P ressing MEMORY while in RUN briefly displays the number of the current memory location study number
18. or key This will display the memory location of the last study performed For example 19 would indicate that the last study was the 19th study stored in memory The E or E keys are used to select other memory locations Pressing E would select 18 but pressing E would wrap around to the first study and select l e Refer to Figure 7 If Session mode is enabled pressing MEMORY will display which is the last session completed a currently open session cannot be viewed in memory The FUNCTION arrow keys select the desired Session The RANGE arrow keys select either individual memory locations of Studies within that session or the overall session data 16 SESSION MOD 9 GROUP PREVIOUS STUDIES SELECT MEMORY LOCATION 1 LOC 2 LOC 310 gt o eju LEQ LAVG REVIEW SELECTED MEASUREMENTS Once the memory location of the desired study is selected press ENTER to view the measurement results The measurement parameters such as range weighting and response will be shown in the display and the M indicator will be lit If an optional bandpass filter was used during the study the frequency will be briefly displayed Use the FUNCTION key to select the measurements of interest Only measurements currently selected via the Setup menu will be available for viewing but these can be changed at any time by going back to the Setup menu Pressing ENTE
19. 0k 20k FREQUENCY Hz Figure 19 0E7052 Microphone Response 6 4 2 RELATIVE RESPUNSE dB m FREQUENCY Hz Figure 20 Effect of Microphone Output Capacitance on Preamp Low Frequency Response 50 6 5 Microphone Preamplifi e r Extension 5 Cables 6 The preamplifi o removable E b y 5 unscrewing the black 10 20 30 40 50 60 70 plastig MICROPHONE CAPACITANCE pF collar below the Figure 21 Microphone Output Attenuation Caused by Input preamplifi Capacitance of Preamp e r housing Extension cables of up to 100 feet in length can be connected between the preamplifier and meter Quest Electronics offers the following lengths of remote cables 59 733 10 10 Ft Remote Cable 59 734 ICM 50 50 Ft Remote Cable The calibration level at 1kHz and below is affected by less than 0 1 dB with the insertion of a cable Therefore there is no need to recalibrate when the cable is added Maximum 140 10 0 output at h i h ES frequencie as amp 5 is zg 135 5 62 a gt affected Uo by long uu 130 316 lengths uz SUE ams e 0 T i 5 25 effect is E shown in zu 55 Figure 22 He Sg o 6 6 Input Buffer 120 1 00 Circuitry 20k The FREQUENCY Hz h i h Figure 22 Frequency Amplitude Limitations with Extension Cables impedance
20. 2 compatible device such as a personal computer via the supplied cable An optional Parallel Interface Module is used to connect to a parallel printer 3 OPERATING PROCEDURE Pressing the ON OFF key will turn the meter on The initial display is 1900 where 128k bytes is the amount of memory installed The next display shows the revision of the installed firmware 5 second warmup will follow and the display will 5 counting down to la If the logging memory has been filled the display will read FULL for those 5 seconds If this occurs reset the unit before performing any studies 3 1 Measured Quantities The FUNCTION switch steps through the following possible measurements performed by the model 1900 This list may be shortened as desired via the DISP Setup Menu Refer to section 3 3 Setup Menus for details SPL Sound Pressure Level will be displayed with the selected weighting and response characteristics The value displayed is the maximum SPL during the previous second SPL is also always shown in the display bar indicator LEQ The average integrated sound level accumulated while in the RUN mode is shown in the numeric display LEQ indicates that a 3dB exchange rate was used for the measurements LAVG The same type of measurement as LEQ except that a 4 5 or 6dB exchange rate was used The display will be correct for the exchange rate selected TWA Time Wei
21. 300 600 1200 2400 4800 9600 19200 baud or parallel printer output PRLL FLOW Flow control or handshaking Select HARDware SOFTware or OFF This is important for transfers of large amounts of data to prevent lost data EOL End of Line Characters Choice of Cr carriage return CrLF carriage return and line feed LF line feed LFCr line feed and carriage return Cycle through these parameters by pressing the ana keys Press the RESET EDIT key to change the values Pressing ENTER returns to the COMM display Refer to section 4 Communications for more information 25 displayed menu 26 Setup Menu Measurement parameters Refer to Figure 11 After pressing SETUP the keys may be pressed until PARA is Pressing ENTER gets you into the Measurement Parameter setup where the following parameters may be set ER Exchange Rate selection of 3 4 5 or 6dB Changing this parameter from 3dB changes LEQ to LAVG for all displays TH Threshold level for averaging set dB level from 0 to 180 or turn off If the threshold is enabled the meter will not integrate SPL below the threshold LNX Four selectable exceedance LN values 1 through 4 For each LNX set N from 1 to 99 in 1 increments Ton Threshold Trigger ON level set dB level from 0 to 180 or turn off Sets Threshold triggered study initiation level ToFF Threshold Trigger OFF level set dB level or
22. 5 SPECIFICATIONS OB 300 Standards ANSI S1 11 1986 Order 3 Type 2 Sub type C and IEC R225 1966 Center Frequencies 1 3 Mode 33 frequencies from 12 5 Hz to 20 kHz 1 1 Mode 11 frequencies from 16 Hz to 16 kHz Frequency Selection Full manual control or automatic sequential stepping through each frequency Power Source Sound Level Meter Size 3 3 x 4 2 x 1 8 inches 84 x 107 x 47mm Weight 9 ounces 255 grams 70 10 Typicol 1 1 Octave Response 20 Typical 173 Octave Response 30 40 50 60 RELATIVE TRANSMISSION LOSS dB 01 015 02 03 04 06 08 1 15 FREQUENCY RATIO f f 3 4 6 8 10 Figure 32 Typical OB 300 Filter Response DOWN TIME MODE 0 300 gt OdB 200B VIL S 1 1 gy 9 d 9 AUTO MANUAL OFF MANUAL AUTO SEQUENCING CIRCUIT ORDER 3 OCTAVE FILTER POWER BLANK SUPPLY SIGNAL CONTROL SIGNAL INPUT SELECT LED 1 FREQUENCY INDICATORS pm ON OFF TD CIRCUITS oa POWER SUPPLY esv 65V IN 401 0 SWITCHED 6 5V SWITCHED 30 15 PROGRAMMABLE SIGNAL OUTPUT OdB 200B GAIN CIRCUIT INPUT QUTPUT AS VIEWED INTO FILTER CONNECTOR GND GND SIG IN FROM METER FREQUENCY
23. 51 input circuitry 1 Megohm in series with 0 1 MFD of the model 1900 will accept up to a 10 volt RMS signal The model 2900 will accept up to 4 volts RMS With the microphone and preamplifier removed other transducer devices such as the Quest Model VI 90 Vibration Integrator can be connected to give a dB readout on the meter To remove the preamplifier unscrew the black plastic collar below the preamp housing Note that when connecting other input devices to the Model 1900 the 200 volt microphone polarization switch located inside of the battery compartment should be turned OFF for safety Only use pins 1 and 3 for the AC signal input NEVER connect to pins 2 and 4 52 To input an electrical signal requires a special connector Quest part number 1 SIGNAL INPUT 14 739 Figure 23 shows the e00V _ function of each of the pins SIGNAL GND SHIELD within the meter input connector s CIRCUITRY HTHER THAN THE QUEST PREAMP 6 7 Weighting Figure 23 Meter Electrical Input Direct Characteristics The weighting characteristics frequency response for A C and LINear are shown in Figure 24 The A weighting response emulates the response of the human ear and is used for most industrial and community noise measurements C weighting is often used for measuring noise reduction in hearing protectors and for other scientific purposes The LINear weighting has a flat frequency response over the range of hu
24. CODE METER nmoow BLANK OUT TO METER SIG DUT TO METER DUT METER 6 5 V FROM METER 6 5 V FROM METER ON OFF METER Figure 33 Block Diagram of Models OB 100 and OB 300 71 QUEST SERVICE AND WARRANTY POLICY Service Policy The Quest product you have purchased is one of the finest acoustic instruments available It is backed by our full one year warranty which seeks complete customer satisfaction This is your assurance that you can expect prompt courteous service for your equipment from the entire Quest Service organization Should your Quest equipment need to be returned for repair or recalibration please contact the Service Department at 1 800 245 0779 USA or Fax 414 567 4047 for a Return Authorization Number The RA number is valid for 30 days and must be shown on the shipping label and purchase order cover letter If you are unable to return instruments in that time call for a new RA number Send it prepaid and properly packed in the original shipping carton directly to Quest Technologies 510 S Worthington St Oconomowoc WI 53066 U S A Repair or replacement work done under warranty will be performed free of charge and the instrument will be returned to you prepaid Your copy or a photocopy of the Quest Registration Card will serve as proof of warranty Should the factory require this information If for any reason you should find it necessary to contact the fac
25. ION TO THE MODELS 1900 2900 The Quest Models 1900 and 2900 are advanced sound level meters which perform a wide variety of acoustical measurements Both exponential averaged and time integrated measurements may be made with the capability of either internal or external data logging The output of an independently weighted peak detector may also be displayed or logged Applications include laboratory industrial community and audiometric measurement and analysis The models 1900 and 2900 provide a numerical readout of measurements as well as a moving bar graph indication The results of individual sound studies may be stored in internal memory for future reference Meter operation is controlled from either the membrane keypad or through the communications port AC and DC output jacks are provided for connecting to external devices such as audio recorders chart recorders oscilloscopes etc Data may be sent to a parallel printer by using a special interface cable The meters are housed in a tough injection molded plastic case with internal shielding to protect against external electrical interference such as that from motors or portable radios The Model 1900 delivers Type 1 accuracy for critical measurements while the model 2900 is a Type 2 instrument for general field survey work The model 2900 uses a 0 52 inch electret microphone while the 1900 accommodates a variety of microphones to meet even the most unconventional applications As both
26. ITHIUM BATTERY WITH TYPE CR2032 CAUTION Be careful not to turn on the 200 volt polarization switch if a prepolarized electret microphone is attached The microphone may be damaged 200 MICROPHONE POLARIZATION CAUTION USE 9 VOLT ALKALINE BATTERIES ONLY NEDA 1604A 1 2 Initial Turn On and Check Figure 2 200V Polarization Before taking measurements with the Model Switch 1900 there is a series of quick checks that should be performed Turn the unit on by pressing the ON OFF key The display will indicate that a brief warmup is taking place Check for the BAT indicator in the display If it indicates a low battery condition replace the batteries A measurement display such as SPL or LEQ will appear in the display Pressing the FUNCTION key will select a different display Press FUNCTION to review the possible measurements When you have done this set the display to read SPL The meter is now displaying current Sound Pressure Level Press the A C LIN key to change the frequency weighting Press the FAST SLOW PEAK IMPULSE key to change the response time of the reading To perform an Acoustic Study press RUN PAUSE Allow the meter to run for a while and press RUN PAUSE again to end the study The FUNCTION key may now be used to review the results Although the Model 1900 will maintain accurate calibration over a long period of time the calibration should be checked and the meter slightly adjusted if necessary b
27. R will return to the memory location or session number display Pressing MEMORY returns to Pause mode The data in the memory location being reviewed may be printed using the PRINT key Refer to section 4 4 Printing Data Data logged during a study may be viewed by printing the Time History portion of the printout PAUSE FE THU TAKM mM SESSION MODE ON j Ch 05 SESS LAST LOC 10 LOC 05 910C _ SESS SESS 04 SESS 03 SESS 02 SESS er FUNCTION LAST SESS e L FIRST LOC bi x Figure 7 Reviewing Data Stored in Memory LEQ LAVG FUNCTION REVIEW SELECTED MEASUREMENTS TAKM BATT 17 Memory Capacity The number of studies memory locations that can be created is limited by the amount of memory The amount of data that is logged if any during a study will also fill the available memory Logging data every second will fill memory faster than logging every minute Session mode will also use more memory due to the extra summary information that must be stored If the memory fills during a study the unit will PAUSE and display FULL In addition to the problem of filling the memory the total amount of energy accumulated during a study can cause the unit to overflow causing calculation errors This is dependent upon the range setting and how high the SPLs are during the study This can be determine
28. Run Pause Clock Calendar Triggered Power on and run for programmed run duration Minimum Measurement Meter only with Model QE4146 Microphone 27 dBA Various Weightings with an Octave Filter Set refer to Section 6 8 The minimum measurement varies depending on the filter frequency selected Maximum Measurement With Model QE4146 Microphone 120 dB with 20 dB Crest Factor 140 dB if measuring a sinusoidal signal Overload indication will occur if upper range is exceeded Optional microphones may raise the upper measurement limit Frequency Weighting Networks C and Linear When using a filter set any one of the weightings may be selected Meter Response Slow Fast Impulse and Peak The Peak onset time constant is less than 50 microseconds Peak measurements may be made in either A C or Linear Weighting A second peak detector is included for logged measurements 58 Microphones Removable 1 2 inch prepolarized condenser electr microphone is standard Optional 1 2 inch one inch other microphones are available for the model 1900 only et and Preamplifier Directly accepts 0 52 microphone other sizes with proper adapter Removable the preamp will drive up to 100 feet cable with negligible signal loss See Figure 22 Model 1900 Preamplifier model 056 856 The input impedance is greater than 1 gigaohm in parallel with 2 pF Model 2900 Preamplifier model 056 852 The input impedance
29. UNCTION At each of the five measured quantities press RESET EDIT to turn that quantity on or off Do the same for STAT To select the destination for logged data depress FUNCTION to display T Oncom or ong which sends logged data to the COMM jack or internal memory respectively Use the RESET EDIT key to turn these options on or off To select the logging interval press EDIT RESET which will light the bargraph over the time interval shown on the display Use the UP or DOWN arrow key to select the desired time interval The choices are 1 3 5 10 15 or 30 seconds 1 3 5 10 15 or 30 minutes 1 2 4 8 or 24 hours gt a n 2 o 2 lt gt a a lt z am When the desired interval is displayed press ENTER to store your selection TAKM AND CANNOT Press ENTER again to exit the LOG Setup menu PARA Figure 8 Display Setup Menu 21 22 ann 3 82 30 ONJ NOLLINN 4 lt gt 00561 0096 0086 0052 0021 009 008 anyag Q38VN3 SI 300 NOISS3S 31 Q3AvldSIQ AINO SI 201 NOILINNA ZU Ov d 105 Ov 113 vava SIHL ES lt gt uns H OL mm 1489 4 901 9510 w 4 Figure 10 Print and Communications Setup Menus 24 NOLLYNILS3Q viva WWO2 039901 Wad
30. a an ASCII command through the COMM jack refer to Section 4 3 Remote Control Note Calibrate the meter before performing any measurements Peak detector and C A calibration is lost when the battery is removed Refer to section 5 1 Note Due to intrinsic safety requirements for use in hazardous locations the model 2900 UL does not have a user replaceable lithium battery Safety approvals are indicated by a label on the meter and the serial number prefix CE If your model 2900 has UL safety approval consult your dealer or the factory for lithium cell replacement 3 6 C A Measurements Second RMS Option The C A option provides a second RMS circuit which allows simultaneous measurement of both C and A weighted sound pressure levels for evaluation of hearing protectors and other noise reduction devices C A LEQ or LAVG is indicated by XX X on the display Note If a threshold is set it affects both C and A which may cause large values for C A if the levels are at or near the threshold See PARA Setup Menu regarding thresholds The C A option is enabled by entering the Display Setup Menu DISP Press the FUNCTION or E key to display oFF Press RESET EDIT to change to e Refert to section 3 3 C A LEQ or LAVG will only be displayed under the following conditions 1 weighting must be selected If C or Linear weighting is selected by pressing the A C LINEAR key the display will show Bandpass
31. alibrator should result An error of 0 5 dB is acceptable This is due to the center frequency filter tolerance of 0 5 dB maximum 4 Change the filter frequency to 500 and read the display Then change to 2k and read the display At both frequencies the readings should be 19 to 23 dB less than the 1 kHz calibrator level 55 Change the filter frequency to 1k and the meter dB RANGE so that the meter reads 20 to 40 dB less than full scale Press and hold the 20 dB button on the OB 100 The meter reading shall rise approximately 20 dB to verify that the 20 dB button functions 6 Remove the calibrator The analyzer is now ready to use 11 2 Taking a Measurement d Turn the meter POWER switch ON The meter will turn on in the Pause mode 2 Set the RANGE to 80 140 dB Set the RESPONSE to FAST WEIGHTING to LIN see note below and the MODE switch to SPL NOTE Note that the filter response can be in series with either A C or LIN However LIN is generally used when taking octave band measurements To minimize settling time following a filter band change FAST response is generally recommended especially if frequent filter band changes will be made Ss Turn the filter s POWER switch to MANUAL to activate the filter 67 If a measurement other than SPL is selected the display will not show a value as no study has been stored under the current conditions filter ON 4 Select the desired filter band by pre
32. and session number PRINT RESET EDIT clear 2 3 Output Jacks DC COMM Press this key while in PAUSE to print all studies in memory to a parallel printer or computer Press this key while in Memory Review to print only the study currently under review To interrupt a printout press again The ENTER key is used in SETUP to enter or exit any of the five setup menus When changing a numeric value in the PARA menu it will store that value and turn off the bar graph segments above that parameter This key has two functions While in SETUP it is used to turn on or off display logging or print choices or to cycle through certain parameter selections 3 gt 4 gt 5 gt 6 gt 3 dB exchange rate for example When not in setup i e in PAUSE pressing and holding RESET EDIT will the internal memory O CONNECTION SIGNAL GROUND The Sound Pressure Level SPL over the 60 dB range selected is linearly represented by 0 to 1 volt DC output Zero volts is equal to the bottom of the range and 1 volt is equal to full scale This output is provided for connecting to a 0 to 1 volt input data acquisition system or chart recorder See section 4 4 Chart Recording for details Figure 5 Output Jack Connections This jack provides an amplified weighted AC signal Full scale output SPL equals 3 16VAC The COMM jack is used for direct connection to an RS 23
33. and the display will show q OL Percentage of time during the study that an overload OL condition occurred Overload indicates that the signal has exceeded the measuring range PA2S Sound Exposure in Pascal squared seconds or Pascal PA2H squared hours switching from Pa2S to Pa2H at 3600 Pa2S The display will show if the exchange rate is not SEL The Sound Exposure Level is the constant sound level which if lasting for one second would deliver the same amount of acoustical energy as that accumulated over the entire study RTMS or RTHM The total RUN time will be displayed Time may be displayed in MIN SEC and HRS MIN The MIN SEC display for a study that lasts over one hour will wrap around to 00 00 The HRS MIN display will count to 99 59 and then wrap around to 00 00 but the actual time will be stored in memory LPK LLOG TAKM BATT LC A The Peak Level The output of a second peak detector may be viewed as LPK or logged The frequency weighting independent of the main RMS detector and may be set in PARA setup menu as 2PK log peaks is made in the LOG Setup Menu is the The selection of whether or not to The weighting selection A C or LIN is made in the PARA Setup Menu While viewing LPK the weighting of the second peak detector is displayed and the Weighting and Response keys are disabled The LEQ or LAVG last logged during a study Data is
34. backlight on for several seconds Pressing and holding for 3 seconds will turn the backlight on until the switch is again pressed to turn it off Note Leaving the backlight on for extended periods will reduce battery life Press this key to begin a study which automatically increments the memory location counter by 1 The number of the location appears on the display briefly after pressing RUN Pressing RUN PAUSE again ends the study and stores the data in that memory location c 1 Press the E or E to increase or decrease the 60dB measuring range in 10dB steps Pressing this key while in RUN ends the current stud and begins a new study When this happens the memory location will momentarily appear on the screen so that the operator may make note of his time and location for that study Key locked out while in Session mode and RUN RANGE While inside the SETUP menus the RANGE key may be used as UP and DOWN arrows for incrementing or decrementing numeric values 8 D 9 9 69 88 8 Figure 4 Model 1900 Meter Fast Press this key to select the time averaging from the four choices of SLOW FAST SLOW IMPULSE or PEAK A display annunciator indicates the response by displaying F S I or P Pressing this key while in RUN mode will end the current study and begin a new stud Key locked out while in Session mode and RUN Ref
35. ctave 27 0 0 12 LOD OUT METER Filter Set 28 0 0 13 65 V FROM METER aes 1 3 0 0 14 65 v FROM METER pp 0 0 15 e ON OFF METER analyzer with the addition Figure 30 External Filter Connector of the OB 300 Filter Set The two units are connected together with the long captive screw provided with the filter box The operating considerations for the Model 1900 Section 3 1 are basically the same when using the filters with the meter 66 11 1 Operational Check The Model 1900 should be calibrated as outlined in the meter section of the manual Section 5 1 while the filter module is OFF The filter has a fixed gain of approximately 1 0 dB at each center frequency and requires no adjustment After the meter is calibrated check the filter for proper operation as follows 1 Read the calibrator 1 kHz output level Set the meter dB RANGE switch so that the calibrator level will indicate within the upper 20 dB of the meter display Set the RESPONSE switch to FAST WEIGHTING switch to LIN and MODE switch to SPL Turn the POWER switch to ON 2 Set the filter s switch to MANUAL If using an OB 300 set the MODE switch to 1 1 Then use the UP or DOWN arrow buttons on the filter to select the 1 kHz filter C Place the calibrator and adapter if needed onto the microphone Turn the calibrator ON meter reading that is very close to the level listed on the c
36. cy during the RUN mode START UP and DOWN Arrows Allows the user to step through the different bandpass filters The two buttons allow manual frequency control in MANUAL Mode or frequency direction control in AUTO Mode 20 dB When this button is pressed the output of the filter is amplified by 20 dB and then fed back to the sound level meter Therefore 20 dB has to be subtracted from the meter reading when using this button NOTE This button should not be pressed during a study as it will result in incorrect data 65 TIME A screwdriver adjustment controls the automatic cycle time of each filter frequency from approximately 5 to 30 seconds MODE Switch OB 300 only Selects either the 1 3 octave filter set 33 frequencies or the 1 1 octave filter set 11 frequencies 10 2 Filter Connector The 30 pin connector on the top of the filter is used for connecting the filter to the sound level meter Figure 30 shows the pinout for the filter connector 1 1 gt OPERATING PROCEDURE 16 5 01 1 AS VIEWED INTO The FILTER CONNECTOR 12 00 8 GND Model 1900 18 0 0 3 SIG IN FROM METER DUTPUT becomes an 19 00 4 Octave 20 O 0 5 FREQUENCY CODE Band 00 6 METER Analyzer ee 0 0 7 D with the 23 00 8 addition 24 00 9 of the 25 0 10 BLANK DUT TO OB 100 26 11 SIG DUT METER O
37. d from the value of SEL at various exchange rates as follows Exchange Rate Maximum SEL Without Overflow 3 dB 150 dB Range 4 dB 200 dB Range 5 dB 250 dB Range 6 dB 301 dB Range 18 For example with an exchange rate of 3dB on the 60 120 maximum SEL without overflow would be 150 dB 60 dB 210dB dB range the The following chart shows approximate time available versus logging rate and number of items logged for the standard 128Kbyte memory Maximum number of studies with no data logged 796 for 128k memory Logging Rate Number of items logged 1 2 3 4 5 second 21 hr 10 5 hr 7 hr 5 hr 4 hr 3 seconds 2 6 dy 1 3 dy 21 hr 15 hr 12 5 hr 5 seconds 4 4 dy 2 2 dy 1 4 dy ll 21 ht 1 0 8 7 4 4 dy 2 8 dy 2 2 dy 1 7 dy 15 seconds 13 3 dy 6 5 dy 4 4 dy 3 3 dy 2 6 dy 30 seconds 26 dy 13 2 dy 8 7 dy 6 6 dy 5 3 dy 1 minute 53 dy 26 dy 17 6 dy 13 3 dy 10 5 dy 3 minutes 159 dy 79 dy 53 dy 39 dy 31 dy 5 minutes 265 dy 132 dy 88 dy 66 dy 53 dy 0 minutes 1 3 yr 265 dy 176 dy 132 dy 106 dy 5 minutes 2 2 yr 1 yr 265 dy 198 dy 159 dy 30 minutes 4 3 yr 2 2 yr 1 3 yr 1 yr 318 dy hour 8 6 yr 4 3 yr 2 9 yr 242 yr 1 7 yr 2 hours 17 yr 8 6 yr yE 4 3 3 4 4 hours 34 yr 17 yr 11 6 yr 8 6 yr 6 9 yr 8 hours 69 yr 34 yr 23 yr 17 yr 13 9 yr 24 hours 209 yr 104 yr 69 yr 52 yr 41 yr If the 512K memory option is installed the above times would increase by a factor of 4 The total numb
38. efore each use To check the calibration of the Model 1900 perform the following procedure using a Quest Calibrator i Turn the Calibrator ON If optional set the frequency to 1 kHz Note the SPL of the calibrator 34 Insert the microphone fully into the calibrator adapter ring if required for the size microphone in use 4 Slowly place the Calibrator onto the adapter microphone 5 Using the FUNCTION key set the Model 1900 to read SPL and set the weighting response and range as appropriate Note SPL must be one of the display options enabled in the Setup Menu 64 Use a screwdriver to adjust the calibration control located through the small hole on the left side of the meter until the display matches the calibration level Storing the Calibration Value The model 1900 can store the time date and SPL of a calibration which will be included in the printout and in downloaded data for each study Enter the PARA Setup Menu and go to CAL by pressing the following keys SETUP Eor Eto PARA ENTER Eor Eto CAL The meter will display current SPL Perform a calibration as directed in the previous section Range and weighting keys will be operational but the response time will be set to FAST When the reading on the display is correct press ENTER to store The display will briefly read CAL and return to the PARA menu display The calibration SPL time and date are now stored Press SETUP to return to the measureme
39. er of logged items LEO LMAX LPK L10 or L90 possible can be calculated by the following formula of logged items 2 3 M 144 x of studies 3072 x of studies with stats logged where M 114687 w 128k memory or 507903 w 512k memory The total run time is calcuated by multiplying the number of logged items by the logging rate divided by the number of items logged Erasing Stored Data To erase the data in the memory locations the meter must be in the Pause mode Press and hold the RESET EDIT key for five seconds The display will read 54 count down from 5 to 1 will be displayed The memory is now cleared and the next study will be stored in memory location 1 19 3 3 Setup Menus The operation of the model 1900 may be customized through the Setup menus While in PAUSE mode pressing the SETUP key lights the SET annunciator in the display and allows access to the various menus Pressing the FUNCTION E or E keys selects from among the five Setup menus Once the desired menu is displayed pressing the ENTER key enters that menu and displays the first item that may be modified Refer to figures 8 11 The five menus are DISP Displayed Data or the measurements that may be viewed by pressing FUNCTION while in RUN or PAUSE LOG Logged Data and Logging parameters or which measurements are logged where the data is stored and how often the data is stored PRNT Printout f
40. er to section 6 8 for details on time averaging Press this key to cycle the frequency weighting through the choices of A or Linear The choice is shown by a letter following dB in LIN the display A C or L Pressing this key while in RUN mode will end the current study and begin a new study Key is locked out while in Session mode and RUN Press FUNCTION or to select any of the following displays that have been selected via the SETUP key SPL LEQ LAVG TWA LMAX LMIN LN1 LN2 LN3 LN4 LDN CNEL OL time exposure in Pa2S or Pa2H SEL elapsed TIME min sec elapsed TIME hour min LLOG LAVG or LEQ last logged this value updates every logging interval BATT or TAKM If the C A option is installed C A Leq or Lavg may also be displayed Refer to section 3 1 Measured Quantities FUNCTION While in RUN mode the display shows the current value for the study While in PAUSE mode the final value for the previous study is displayed SPL will always show the current 1 second MAX according to the response selected F S I P While in PAUSE if selecting quantities such as LMAX LEQ etc after the meter has been RESET had it s memory cleared the display will show FUNCTION is also used while in the setup mode as an up down arrow key for Selecting menus or parameters While in PAUSE mode press SETUP to access one of five Setup Menus which allow the user to define the operation
41. ession mode RESET clears the memory SAxxxxxxxxx stores the meter s serial number where xxxxxxxxx is the serial number on the back panel RUN places unit into RUN mode PAUSE places unit into PAUSE mode Messages Returned From the Meter The model 1900 can be connected to a serial RS 232 printer or a PC by using the serial interface cable provided with the meter A 25 pin male to FULL indicates internal memory is filled The meter should male gender changer will be required for connection to the printer The be reset before beginning another study printer s communications parameters must match that of the model 1900 Refer to the preceding section C A OPTION NOT INSTALLED returned when a request has been made for a reading from an option which is not installed Some printers can work either in serial or parallel mode The printer must be set up for one or the other Simply plugging into the correct C A DISABLED indicates that the C A option is installed but connector is not sufficient Refer to the printer s manual THE 1900 HAS A not turned on in the DISP Setup Menu SEPARATE CABLE FOR CONNECTING TO A PARALLEL PRINTER THE SERIAL CABLE CANNOT BE ADAPTED TO WORK WITH A PARALLEL PRINTER 4 4 Printing Data The model 1900 may be connected to either a parallel or serial RS 232 SAMPLE PRINTOUT printer by using the proper cable and adapter Data may also be printed directly to a PC by using a communications packa
42. field 200V polarized 50 mv Pa 20 145dB QE4140 1 2 inch pressure 200V polarized 16 mv Pa 35 160dB QE4110 1 4 inch freefield 200V polarized 3 5 mV Pa 60 175 084120 1 4 inch pressure 200V polarized 1 3 mv Pa 60 175dB QE4846 1 2 inch freefield prepolarized 40 mv Pa 25 140dB Typical microphone response curves for the Models QE4846 and QE4170 are shown in Figures 17 and 18 respectively RANDOM oh INCIDENCE 70 6 ELECTROSTATIC ACTUATOR METHOD 8 PRESSURE 10 12 1 1 1 4 1 1 1 IIIJ 1 100 200 500 1 2 5k 10k 20k FREQUENCY Hz Figure 18 Typical Figure 17 0E4846 Microphone Response Frequency Response Model QE4170 Microphone 49 6 3 Microphone Model 2900 The model 2900 is designed to accept prepolarized electret microphone Model QE7052 The impedance of this microphone is 18pF The microphone screws directly onto the preamplifier model 056 852 Typical response for the QE7052 is shown in Figure 19 6 4 Preamplifi 2 er Input Characteri stics The i t impedance DEM E C retain both the 10 l frequency 12 response and the microphone attenuatio n as shown in Figures 20 and 21 The approximate microphone capacitances for the 1 2 inch and one inch microphones are 18pf and 60pf respectively L L L LL L 1 IL 1 100 200 500 ik 2k 5k 1
43. ge such as Procomm or Windows HEADER SECTION Terminal The printout contains the information from each study or an individual study including ds All measurement parameters Range Weighting etc Meter 2 Data Summary of all measured parameters LEQ LMAX etc e NE AME ES 3 Start Stop and Run Times and OL Time in ud Name The information printed will be that selected in the Print PRNT Setup Work Area Menu Refer to section 3 3 See the following two pages for a sample Comments printout The printout sections selected in the setup menu are labeled on the sample printout for clarity To connect the model 1900 to a parallel printer the 056 875 Parallel Moter mut FIDE A ate Interface is required The 8 pin miniature DIN connector plugs into the COMM beats eria lumber 2 o o alibration Date jack on the side of the meter The 36 pin flat cable connector plugs into the printer The meter must be set for parallel operation PRLL option for RATE located in the COMM Setup Menu Refer to section 3 3 SUMMARY SECTION The meter and the printer should all have their power switches turned ON The meter must be in either Pause or Memory Review mode Pressing the PRINT key will start the printout The printout will contain either of the Notes following 1 If the meter is in the Memory
44. ghted Average The average level accumulated during a study but calculated with an eight hour integration time LMAX The Maximum SPL obtained while in the RUN mode is shown in the numeric display With PEAK response selected this functions as a Peak Hold LMIN The Minimum Sound Pressure Level obtained while in the RUN mode is shown in the numeric display 10 LN The SPL exceeded for N of the time during a study Four user selectable values are calculated The default values are L5 L10 L50 and L90 The values may be changed in the PARA Setup Menu LDN Day Night Sound Level The average sound pressure over a 24 hour study with additional factors for time of day Sound pressures between the hours of 10 pm and 7 am are increased by 10dB prior to being averaged A 3dB exchange rate should be used and is generally assumed If an exchange rate other than 3dB is selected via the Setup Menu LDN will not be calculated and will be displayed CNEL Community Noise Exposure Level The average sound pressure over a 24 hour study with additional factors for time of day Sound pressures between the hours of 7 pm and 10 pm are increased by 5dB prior to being averaged Sound pressures between the hours of 10 pm and 7 am are increased by 10dB prior to being averaged 3dB exchange rate should be used and is generally assumed If an exchange rate other than 3dB is selected via the Setup Menu CNEL will not be calculated
45. h Threshold Triggered and Auto Timed studies may not 2 z ES ae Bl yF be enabled simultaneously While in the Setup Menu one E m mE 6 may not be enabled without first disabling the other g ig gt 4 4 935 E g a EI A Filter Controlled Study Each time the filter band on the 4 S A A E optional bandpass filters OB 100 or OB 300 is changed either A A A manually or automatically the current study is ended and after a A n n g g PE brief settling time a new study will begin A 4 2 E im 2 2 9 A a 4 NOTE For long term unattended measurements where the possibility of 23 e X E power interruption exists it is recommended that the meter be set amp Vo x x A Sz 2 up to run shorter term consecutive studies such as one hour a 3 4 4 RS threshold triggered studies with a Trigger Threshold ON level sufficiently low to always retrigger at the end of the hour If A A ZA ZA ZA g g power is interrupted during a RUN all data for that study will be 4 4 4 4 4 5 lost The data from previous studies will be retained a m 2 2 1 3 3 3 3 3 3 NS NA a 5 a a 4 4 z 2 ox 5 5 o a a o 5 5 5 5 5 Bit u die 5 5 5 5 5 OB M gt z z 5 5 5 5 5 2 85 ze go 55 5 ee oL D a Se 9 9o
46. he value LLOG and the logging time interval C A returns C A LEQ or LAVG if C A board is installed and enabled BATT returns the voltage of the weaker battery aa EM returns location TAKM returns the integrated Taktmaximal value he current or last if in PAUSE memory Operating Status Commands Change or request the settings of measurement parameters and unit operation Sending the command with no value for x returns the current setting WGTx or L sets weighting to x if in PAUSE RESx x S I or P sets response to x if in PAUSE RNGx x 20 30 40 etc to set range if in PAUSE PARA returns the current settings for Run Pause range weighting response time integration threshold exchange rate peak weighting bandpass filter frequency BLON turns on the display backlight BLOFF turns off the display backlight FILT returns current bandpass filter frequency or NONE The following commands will be executed only in PAUSE mode Setup Commands Duplicates the functions available inside the setup menus Omitting parameters x y or 2 will return the current setting Refer to Section 3 3 for details on setting the following parameters LOGxy Sets quantities to log x 1 for LEQ or LAVG x M for LMAX x P for LPK for 110 x 9 for 190 y ON to enable logging y OFF to disable logging LINTxxy Sets the logging interval xx 2 digit number from the val
47. hich will be included in the printout and in downloaded data for each study Enter the PARA Setup Menu and go to CAL by pressing the following keys SETUP Eor Eto PARA ENTER Eor Eto CAL The number in the display is the current SPL Calibrate as directed in the previous section Range and weighting keys will be operational but the response time will be set to FAST When the reading on the display is correct press ENTER to store The display will briefly read CAL and return to the PARA menu display The calibration SPL time and date are now stored NOTE When ENTER is pressed to store the calibration value the logging peak detector and C A option if installed are also calibrated This should be done whenever the lithium battery is replaced the peak detector is most accurate over the upper portion of the range the calibration value should be in the upper half of the range used for calibration is important to not disturb the meter during this time as this may cause a high peak reading and 45 result in bad peak data Calibrating A Microphone with A Different Sensitivity The model 1900 covers a 30 140dB measuring range when using the standard 0 52 microphones 39 50 mV Pa The operating range may be adjusted to read correctly for other microphones For instance using a microphone that has 10dB lower sensitivity the meter can be set to cover the range of 40 150dB While in the CAL porti
48. hours Optional 512K upgrade allows logging of 5 quantities at 1 second intervals for up to 18 hours 30 minutes Decreasing the number of logged quantities or increasing the logging time interval increases available logging time capacity proportionately 61 Temperature Range Operating 10 C to 50 C Accuracy is within 0 5 Storage less batteries 20 C to 60 Do not exceed the Storage Temperature Range because possible damage to the unit may result Operating Humidity Over a range of 30 to 90 relative humidity the accuracy is within 0 5 dB Do not exceed 95 relative humidity because possible damage to the unit may result Effect of Magnetic Fields A magnetic field of 1 Oersted 80A m at 60Hz produces a maximum reading of 40 dB on Linear Weighting Effect of Electrostatic Fields Negligible as long as the prote ction grid i S kept the micro phone Batteries Two 9 volt alkaline batteries NEDA 1604A recommended Battery Life Typical operating time for meter alone and for individual operating conditions which increase operating current Combinations of these conditions will further reduce operating time 1900 2900 2900UL Meter only 20 hours 29 hours 24 hours w 200 Volts On 18 hours n a n a w Backlight On 13 hours 19 hours 11 hours w Filter 8 hours 11 hours 3 hours w Option On 17 hours 24 hours 15 hours Tripod Mount threaded insert on back of the meter accepts a
49. hting A Response Slow IEC NOISE MONITORING Threshold OFF Exchange Rate 3dB Weighting A Response Slow TAKTMAXIMAL Weighting A Response Fast TAKM 3 5 Seconds as desired with Logging Interval set to 3 or 5 Seconds to log TAFts as LMAX values if LMAX is enabled in LOG Setup Menu 29 3 4 Overload Detection While viewing SPL the overload indicator OL is displayed whenever the incoming signal saturates overloads the circuitry the OL indicator is on increase the RANGE until the OL condition is removed If an OL condition occurs while in the RUN mode the OL indicator will light and remain on for the duration of the study The percentage overload time is a display option that may be enabled via the DISP setup menu and then selected using the FUNCTION key The overload time will also be printed on the hard copy printout While reviewing a study Stored in memory the OL indicator will remain on if an overload occurred during that study Percentage overload time may be useful in determining the validity of a study during which overload occurred A small percentage indicates that the data is fairly accurate while larger percentage indicates that significant errors occurred An overload will also be indicated while logging to the serial port or printing a time history of a study For each logging interval that contained an overload condition OL will print at the end of that line of data 3 5 Battery Replaceme
50. ime the filter band changes a new study is initiated and the memory location counter will increment A brief period of time will occur between studies to allow for measurement settling time When the last frequency of interest has completed its cycle time slide the filter POWER switch to MANUAL and immediately place the meter into the Pause mode 68 11 3 Reviewing the Data Each filter band measurement is treated as a separate study the same as if RUN and PAUSE had been pressed to initiate and end a study Each study is Stored in a sequential memory location To review the data the meter must be in the Pause mode When entering a memory location to review data the filter frequency band will be displayed briefly example 6300 Review Stored data as outlined in section 3 2 12 TECHNICAL INFORMATION OB 100 The OB 100 conforms to ANSI S1 11 1986 Order 3 Type 2 Sub type C and IEC R225 1966 The normalized passband characteristic of a typical octave filter response is depicted in Figure 31 The OB 100 filter is flat within 0 5 dB in the passband with the 3 dB down points at approximately 707 fc and 1 414 fc where fc is the center frequency of the band chosen The fc 2 and 2fc frequencies are down by approximately 21 dB with the decade points fc 10 and 10fc down by greater than 70 dB The block diagram of the OB 100 is shown in Figure 33 o 1 1 1 e 1 B o 1
51. inting Data 4 4 Chart Recording 12 I5 15 16 16 18 19 20 20 22 25 29 26 28 29 29 30 31 32 33 35 38 41 5 6 10 11 12 13 14 15 GENERAL SOUND MEASUREMENT PRACTICES Calibration Storing the Calibration Value Calibrating Microphone with Different Sensitivity Meter Microphone Placement o Background Noise Wind Screen Effects orco m WN TECHNICAL INFORMATION 6 Principles of Operation Microphones Model 1900 Microphone Model 2900 Preamplifier Input Characteristics Microphone Preamplifier Extension Cables Input Buffer Circuitry Weighting Characteristics Internal Electrical Noise Tone Burst Response O1 iS SPECIFICATIONS ACCESSORIES INTRODUCTION TO THE MODELS OB 100 and OB 300 ABOUT THE FILTER 10 1 Filter Controls 10 2 Filter Connector OPERATING PROCEDURE 11 1 Operational Check 11 2 Taking a Measurement MANUAL Filter Operation AUTO Filter Operation 11 3 Reviewing the Data TECHNICAL INFORMATION OB 100 SPECIFICATIONS OB 100 TECHNICAL INFORMATION OB 300 SPECIFICATIONS OB 300 QUEST SERVICE AND WARRANTY POLICY 42 43 43 44 44 44 45 46 46 46 48 48 49 49 50 51 52 55 59 60 60 60 62 62 63 63 64 64 65 65 65 67 1 INTRODUCT
52. l OB 50 100 Octave Filter Set Serial No Freq Hz Leq Max Sel Start time 00 3159 785 63 82 77 84 107 89 91 89 88 86 86 84 85 92 102 98 100 91 97 83 89 a 125 90 250 87 500 89 1000 87 2000 87 4000 84 8000 83 6000 M Uli D TIME HISTORY SECTION 1 Sec LEQ LMAX LPK L10 39 100 6dB 101 3dB 102 5dB 101 7dB 40 100 8dB 101 4dB 102 8dB 101 7dB 41 99 6dB 97 5dB 100 3dB 96 7dB 42 100 7dB 102 8dB 103 4dB 98 7dB 43 100 6dB 100 5dB 102 3dB 101 7dB 44 100 8dB 101 8dB 103 4dB 101 7 45 99 97 5 104 96 7 46 100 7dB 100 8dB 102 4dB 98 7 Run time 2 00 09 2 00 11 1 00 10 111 09 112 zit 10 111 oooooooooo L90 78 7 7dB 72 dB 7 7 7 4 7 oooooooooo Slow LIN OL amp 00 00 50 00 00 00 00 00 00 00 41 4 4 Chart Recording The Model 1900 has a DC output that is linearly related to the 60 dB measurement range as follows Bottom of Measuring Range 0 VDC output Top of Measuring Range 1 VDC output 60dB per 1 volt or 16 67 mVDC per 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 that has an input impedance greater than 20K ohms It is also suitable for use with a variet
53. logged at a user defined interval This feature may be used to display a timed for the previous logging interval display updates at the end of each logging interval display will show Wow di LB is not being logged This The The time integration of individual Taktmaximal values Taktmaximal is the maximum level L encountered over either a 3 or 5 second interval 3 or 5 second Taktmaximal is selected in the PARA Setup Menu Individual Taktmaximal L values may be logged by setting the logging interval to 3 or 5 seconds in the LOG Setup Menu Taktmaximal measurements are required by some countries noise regulations A Taktmaximal measurement calculates a higher average level for highly impulsive sounds than does a LEQ measurement TAKM is affected by the Exchange Rate and should be run with an Exchange Rate of 3dB Displays the voltage of the weaker of the two 9 volt batteries to give an indication of remaining life indication BAT on the display occurs at approximately volts The low battery 6 8 An optional second RMS detector may be used to provide a simultaneous C A weighted LEQ or LAVG of the measured sound Refer to section 3 6 C A Option 11 Acoustic Study Options An acoustic Study is a set of measurements performed over a user defined period of time referred to as the Run Time The study begins at the Start Time and ends at the Stop Time Each stud
54. m the display Change the desired settings and then press RUN again to begin a new study It is always a good idea to document all measurement conditions and meter settings for possible future needs a printer is used the settings will all appear on the printout 44 5 1 Calibration To check the calibration of the Model 1900 perform the following procedure using a Quest Calibrator d Check that the BAT indicator is not on indicating that one or both of the batteries is weak 2 Turn the Calibrator optional set the frequency to 1 kHz Note the SPL of the calibrator 3 Insert the microphone fully into the calibrator adapter ring if required for the size microphone in use 4 Slowly place the Calibrator onto the adapter microphone Di Using the FUNCTION key set the Model 1900 to read SPL and set the weighting response and range as appropriate Note SPL must be one of the display options enabled in the Setup Menu 6 Use a screwdriver to adjust the calibration control located through the small hole on the left side of the meter until the display matches the calibration level NOTE Most calibrators are affected by changes in altitude and barometric pressure The rated SPL is set at standard barometric pressure at sea level 760 mm Hg Consult your calibrator manual for correction factors Storing the Calibration Value The model 1900 can store the time date and SPL of a calibration w
55. man hearing and is useful in many applications such as audiometric analysis It is also used when taking octave and 1 3 octave measurements 53 6 8 Internal Electrical Noise The maximum measurable SPL of the 1900 Meter is 140 dB with a sinusoidal impu 120 dB if measuring a complex signal FREQUENCY Hz with a 20 dB crest Figure 24 Weighting Characteristics factor W i t h optional microphones the upper range can be extended to 180 dB RELATIVE RESPONSE dB When used with either the OB 100 or OB 300 filter octave mode the specific minimum measurable SPL s when using either the Model QE4170 or the Model QE4146 microphone are shown in the following tables The inherent noise level is typically at least 5 dB below the RMS values shown in each table Noise Floor values were determined by substituting an equivalent electrical impedance in place of each microphone Model QE4170 1 Inch Microphone equivalent impedance 56pF Weighting All Pass 20dB 27 39dB 31 5 and 63 16 22dB 25dB 125 and 250 16 18 20 500 and 1K 16 16 16 2K and 4K l6dB l6dB 16 8K and 16K l6dB l6dB l6dB 11 6dB is the lowest SPL indicated by the instrument therefore measurements below 16dB are of questionable accuracy 54 Model QE4146 0 52 Inch Microphone equivalent impedance 18pF
56. meters are operationally identical this manual will refer only to the model 1900 except where appropriate Options include expanded logging memory and a second RMS detector to allow simultaneous measurement of C A frequency weighted LEQ or LAVG Plug in the Model OB 300 combination 1 3 1 1 Octave Filter Set and create a 1 3 or 1 1 octave band analyzer covering 33 bands from 12 5 Hz to 20 kHz The addition of the Model OB 100 Octave Filter Set will create an octave band analyzer covering 10 bands from 31 5 Hz to 16 kHz If sound measurements need to be made from a distance simply remove the microphone pre amplifier and insert either an ICM 10 10 foot or an ICM 50 50 foot extension cable Distances of up to 100 feet can be accommodated by adding two ICM 50 extension cables in series With the microphone and preamplifier removed the meter can accept other input devices such as the Quest Model VI 90 Vibration Integrator The VA 508C Vibration Assembly combined with the Models 1900 or 2900 provides a quick and precise method of measuring and analyzing many types of industrial vibration 1 1 Assembling the Meter The microphone and preamplifier must be assembled prior to making any measurements Microphone Handling and Storage The microphones used with the model 1900 will provide years of reliable use but certain precautions should be followed with regard to handling and storage Never remove the microphone grid This will ex
57. nt The BAT indicator in the display means that one or both 9V batteries is weak and should be replaced Make sure the meter is turned off when replacing the batteries Use a phillips head screwdriver to remove the battery cover on the rear of the unit Remove the old batteries and replace with fresh alkaline batteries A lithium coin cell type CR2032 is accessible through the battery compartment This battery maintains the data memory clock calendar and setup information when the meter is turned off A dead lithium cell will cause the meter to lose information stored in the setup menus the serial number and any data long as the meter is turned on this information will not be lost If the meter is to be turned off while changing the lithium cell retrieve any data stored in the meter and make note of setup parameters as these will be erased Refer to figure 2 1 Remove the 9 volt batteries from the battery compartment Using a fingernail or other thin non metallic object push the bottom edge of the battery toward the top microphone end of the meter until it comes out of the holder 2x Insert the new lithium cell edge first and side up into the top of the holder Press the bottom edge of the battery toward the top of the meter until it snaps into the holder 30 3 Reinstall the 9 volt batteries turn the unit on and re enter any setup information including the serial number The serial number is entered vi
58. nt displays such as SPL 2 ABOUT THE METER 2 1 The Display The LCD display provides the user with the selected measurement and the current measurement parameters The measurement range as well as instrument status such low battery BAT RUN PAUSE 986 and OVERLOAD OL is also displayed The numeric display normally updates every second while the bargraph provides a continuous indication of the sound level The bar indicator portion of the display always indicates the current SPL Sound Pressure Level The range of the bar indicator is the same as that of the instrument and is indicated by the numbers on either side of the bargraph Each segment of the bargraph represents 2 dB BARGRAPH INDICATOR OF SPL IN SETUP MENUS SEGMENTS OVER NUMERALS INDICATE THAT LOWER RANGE LIMIT THE QUANTITY MAY BE CHANGED FREQUENCY WEIGHTING UPPER RANGE LIMIT SETUP NC 5 RESPONSE TIME OVERLOAD T p H LOW BATTERY MEASUREMENT PARAMETER BEING DISPLAYED OR EDITED MEASURED VALUE IN SETUP MENUS USED TO INDICATE STATUS OR PARAMETER VALUES UPPER RANGE LIMIT Figure 3 Model 1900 Display 2 2 Keypad Functions Press this key to turn the meter on After a warmup period of several seconds the meter is ready to use Pressing and holding this key for five seconds until OFF is displayed and then releasing will turn the meter off Momentarily pressing this key turns the LCD
59. on is installed TAKM and LC A cannot both be enabled Press ENTER to exit the DISP Setup Menu displaying DISP The FUNCTION E or E keys may now be used to select another Setup menu 20 E PT ET LOG Setup Menu Data to be logged Refer to Figure 9 5 gu After pressing SETUP the E or E keys may be pressed until LOG is Se 7 displayed Pressing ENTER gets you into the Logging Setup Menu and will for IT example display on You may now choose whether or not LEO will be d among the data that will be periodically logged Press RESET EDIT to toggle 9 between Pressing FUNCTION cycles to the next gt 5 9 selection which is turned on or off in the same way The measured quantities available for logging are joaaZz nme ZU ey 120 012 gt zOai LAV or LEQ Peak LMAX L10 190 Note that the Peak value that is logged has independently selectable weighting from that of the main measurement This is set in the PARA Setup Menu In addition whether or not to log to internal memory whether or not to log to the COMM port and the time interval logging rate may be selected Saving statistics tables STAT on or off for each study may also be selected The statistics tables provide useful information when downloaded to the optional PC support software but are not available to the user directly from the meter F
60. on of the PARA Setup Menu apply the calibration tone to the microphone and verify that the meter will not calibrate to the proper level Adjust the calibration control so that the display shows a difference from the desired reading of 10dB or a multiple of 10dB Press The RESET EDIT key will appear in the display The RANGE key may now be pressed to adjust the reading in increments of 10dB adjusting the overall operating range by the same amount When the reading is correct press ENTER to store the calibration value 5 2 Meter Microphone Placement Whenever possible the meter should be tripod mounted in a relatively open area to minimize reflections from your body or other large reflective structures Avoid placement against a wall or in a corner If body reflections are of concern a microphone extension cable may be used to Separate the preamplifier from the meter for better microphone placement When taking measurements while holding the meter in your hand keep your arm fully extended When using a random incidence or pressure microphone point it approximately 70 degrees to the direction of the sound If using a free field microphone point it directly at the noise source 0 degrees 5 3 Background Noise Background noise can cause considerable error in measurement when its level is close to that of the noise source of interest When it is not possible to eliminate or reduce the background noise use the curve sho
61. ormat or printout data presentation PARA easurement Parameters or variables affecting the way a measurement is performed These include thresholds percentage values for LN peak detector weighting etc as well as clock calendar setting and calibration value storage COMM Communications parameters for using the COMM port The key sequence to exit a Setup Menu is the reverse of the one used to enter the menu DISP Setup Menu Displayed data Refer to Figure 8 Press SETUP and the FUNCTION or keys until DISP is displayed Pressing ENTER gets you into the Display Setup Menu and will for example display You may now choose whether or not SPL will be among the active displays by pressing RESET EDIT which toggles between OFF Pressing FUNCTION cycles to the next selection on which may be turned on or off with the RESET EDIT key The displayed quantities that are selected in this manner are SPL Sound Pressure Level LEQ or LAVG Equivalent Level TWA Time Weighted Average LMAX Maximun Level LMIN Minimum Level LN2 LN3 LN4 Exceedance Levels LDN Day Night Level CNEL Community Noise Exposure Level OL Percent Overload Time PA2S or Pa2H Exposure LPK Peak Level SEL Sound Exposure Level RTMS Run Time MIN SEC RTHM Run Time HR MIN LLOG Last LEQ Logged BATT Battery Voltage TAKM Taktmaximal and or LEQ LAVG C A if the C A opti
62. pose the diaphragm making it susceptible to physical damage When removing a microphone from the preamplifier be careful not to unscrew only the grid 1 Never touch the diaphragm ds Electret prepolarized microphones should never be stored at high temperatures as long term degradation of the polarization charge may occur This results in a decrease in microphone sensitivity 4 An electret microphone should be stored in its protective box when not in use for long periods of time To attach the microphone to the preamplifier screw the microphone onto the threaded end of the preamplifier Attach the preamplifier to the meter by placing the connector ends together and rotating the preamplifier until it drops onto the meter Finger tighten the black locking ring by screwing it onto the meter Figure 1 Preamp Assembly MODEL 1900 ONLY Microphone Polarization Voltage 200VDC Check that the microphone polarization voltage switch is set properly This switch is located inside the battery compartment on the rear of the meter To locate this switch remove the battery door with a phillips head Screwdriver and pull the 9 volt batteries out of the compartment Electret or prepolarized microphones such as the QE4146 or QE224 should be operated with the 200 Volt microphone polarization voltage turned OFF Condenser microphones must be operated with the 200 Volts turned ON REPLACE 3V L
63. session The displayed value will be updated each Second except for LLOG which is updated each logging interval as selected in the Setup menu Pressing the MEMORY key during a study will briefly display where XX is the current memory location If the meter is in Session mode pressing MEMORY will briefly display followed by to indicate the current session and memory location While the unit is in PAUSE mode the FUNCTION key may be used to view the results of the previous study or the results of the current session if the meter is in Session mode The exceptions to this are SPL which always shows the current SPL updated once per second and LLOG the value of which is not displayed Again only measurements selected via the Setup Menu will be available for viewing While in PAUSE mode any change to range weighting or response will make the data from the previous study or session available only by reviewing its memory location Turning on the optional bandpass filter or changing its frequency will also cause this to happen 3 2 Reviewing Memory Locations The results of all currently stored studies are available by pressing the MEMORY key The memory review process is slightly different depending upon whether or not Session mode was used to create the data in memory If Session mode was not enabled pressing MEMORY will cause FILE to appear in the display refer to File Creation Press the FUNCTION E
64. ssing the UP or DOWN arrow buttons Press the RANGE E or E keys so that the display reads approximately 20dB below the top of the range MANUAL Filter Operation Place the meter into the Pause mode using the RUN PAUSE key Select the first frequency of interest Current SPL may be viewed on the display If a study is desired press the RUN PAUSE key to enter the Run mode The memory location number will show briefly on the display and the meter will begin accumulating data Remain in Run mode for the required amount of time necessary to obtain a valid sample Press RUN PAUSE to enter the Pause mode change to the next frequency of interest and enter RUN PAUSE again etc Repeat this process for all frequencies of interest Each successive RUN will increment the memory location counter AUTO Filter Operation Place the meter into the Pause mode using the RUN PAUSE key If desired press RESET to clear all internal memory Set the meter for FAST response time to minimize its settling time after the filter switches frequencies Select the first frequency of interest Be sure that the TIME adjustment is set to the desired filter cycle time Slide the filter POWER switch to AUTO To start the sampling sequence place the meter into the RUN mode and immediately press the proper direction button The button causes the frequency to cycle to the next higher frequency the E button causes the frequency to cycle to the next lower frequency Each t
65. standard 1 4 20 tripod mounting screw Size 3 3 x 8 2 x 1 8 inches 84 x 208 x 47mm not including the height of the preamp Weight 23 oz 654g including the preamp and batteries 62 Note Specifications subject to change 63 8 ACCESSORIES 056 981 056 982 056 990 056 988 059 344 058 115 056 877 056 887 059 045 059 046 056 875 056 999 059 899 059 733 059 734 059 703 056 709 64 QC 10 Calibrator 114dB at 1000 Hz Output QC 20 Calibrator Selectable 94dB or 114dB at 250 Hz or 1000 Hz Output Calibrator Microphone Adapters 0 52 diameter 1 4 diameter WS 7 Windscreen for 0 52 microphone package of 3 WS 3 Windscreen for 1 microphone package of 3 C A Measurement Option Factory Installed 512K Memory Option Factory Installed TP 1 Tripod Larger will not fit in carrying case TP 2 Tripod Smaller fits in carrying case Parallel Printer Interface Serial Interface RS 232 to PC cable Preamplifier Remote Cables ICM 2 Microphone Cable 2 foot length ICM 10 Microphone Cable 10 foot length ICM 50 Microphone Cable 50 foot length Input adapter Female BNC to 0 52 microphone thread with 18pF capacitance Allows direct electrical signal input to the meter Quest Suite for Windows PC support software DC Power Supply Module Acccepts 12 16VDC input to power the meter and optional filter 9 INTRODUCTION TO THE MODELS OB 100 and OB 300 The Q
66. studies stored in their memory locations with the addition of an overall summary of all of those studies Any number of consecutive studies may be grouped into a Session For example Session 1 might consist of studies 1 through 5 session 2 might consist of Studies 6 through 9 and session 3 might consist of studies 10 through 31 Pressing RUN after performing a RESET begins Session 1 and Study 1 memory location 1 session is closed in one of four ways 1 Press MEMORY then RESET 2 Change a measurement parameter such as weighting or exchange rate while in PAUSE Weighting Response and Range keys are locked out while in RUN only in Session mode 3 Change the state of an optional bandpass filter This may be done in either RUN or PAUSE 4 Turn the meter off This session cannot be reopened After closing a session the next time RUN is pressed will begin the next session and study Measurements for individual studies cannot be viewed while measuring Session mode The displayed data is for the overall session Individual studies can be viewed by reviewing data in memory Refer to section 3 2 15 Viewing Measured Results While performing a study unit is in RUN mode the FUNCTION key may be used to view the various measurements as they are occurring Only measurements selected via the DISP Setup Menu will be available for viewing If the meter is in Session mode the value displayed will be the overall summary for the entire
67. t and enabled in the setup menu and the meter must be turned OFF When the internal clock calendar reaches this time and date the meter will turn on and begin a study The duration of the study will be that of the Programmed Run Time stored via the setup menu At the end of the study the unit will PAUSE and turn itself OFF The study may be interrupted by depressing the PAUSE key Threshold Triggered Study A Trigger Threshold ON level in a8 zt dB must be set and enabled in the setup menu While in PAUSE 22 2 5 mode press RUN to arm the meter If the SPL reaches the 2285920 x desired level a study will begin The study will end in one ET gush a of three ways If a Trigger Threshold OFF level in dB is set e508 te 2 the study will end when the SPL falls to this level Note This level cannot be greater than the Trigger Threshold ON 982889228 level If a Programmed Run Time duration is enabled the toe ee wr Lm z study will last for the specified length of time unless the ZU NE V TAE n 4 4 amp OFF level is reached If the SPL is still above the ON level B587 9 5 ass zs BY a new study will begin The study may be interrupted by zu 2 amp pressing PAUSE e 2 A A A A 2 NOTE Bot
68. ther a 25 pin male has pins instead of holes connector or a 9 pin male connector 4 1 RS 232 Serial Interface The COMM jack on the side of the model 1900 provides direct connection to a computer s COM port with the serial communications cable 4056 999 provided connect to a serial printer or similar device a 25 pin male to male gender changer is required The pinout of the COMM jack is shown in figure 12 The model 1900 may be controlled under RS 232 control by sending ASCII PIN 1 TXD commands from a computer Measurement PIN 7 RTS results may be requested and received from a remote location PIN 8 RXD PIN 4 GROUND Figure 12 COMM Jack Pinout for RS 232 Communication 32 The communications parameters for the ASCII data byte are the following 1 start bit 8 data bits 1 stop bit No parity disabled Baud rate and flow control must be set the same for both the 1900 and the RS 232 device connected to it RATE and FLOW as set in the COMM Setup Menu Refer to section 3 3 COMM Setup Menu There are three common problems when using COM ports up The ports are often not labelled making it difficult to determine which port is connected 2 The printer output port on the computer is a 25 pin female Adding an extra converter cable to the serial cable and plugging it into the printer port will not work 3 Often some other device such as a mouse is plugged into the COM port If that
69. to the COMM port is selected the only command that would be allowed would be PAUSE Other commands will be ignored At short logging intervals such as 1 and 5 seconds and especially at slower baud rates frequent communication with the unit would be difficult as it would be sending data almost constantly This mode of operation is useful for remote data collection of logged parameters The model 1900 will provide the following output SAMPLE LMAX L10 L90 LPEAK 1 85 4 85 5 85 4 84 9 92 1 2 85 6 85 7 85 5 85 0 89 7 3 85 8 86 5 85 6 85 0 94 0 4 85 7 85 6 85 5 84 9 89 8 5 89 5 90 5 89 3 87 2 94 8 OL While in RUN and not logging to the COMM port the model 1900 will respond to data request commands for display functions by sending the measured quantity requested data and Run Time if requested Any quantity may be requested regardless of what has been selected in the DISP Setup menu For example ASCII command Reply LEO 93 4dB TIME TIME 14 02 34 LEOR LEQ 93 6dB 0 12 25 LN1 LN1 L10 110 47 3dB SPL SPL 98 6dB SPL SPL 103 5 NOTE If the model 1900 is set to log data to the COMM port it must be connected to another device especially if hardware HARD flow control has been selected in the COMM Setup Menu The meter may appear to malfunction when RUN PAUSE is pressed to begin a study as it needs a signal back from the device that it is connected to in order to operate properly When this happens the
70. tory regarding service or shipping damage please direct your calls or letters to the attention of the Service Manager Quest Technologies 414 567 9157 or 800 245 0779 Office hours are from 8 AM to 5 PM Central Standard Time Monday through Friday 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 U S A 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 warranty periods This warranty states our total obligation in place of any other warranties expressed 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 warranty outside the U S A a minimum of one year warranty applies to the same limitation and exceptions as above with service provided or arranged through the authorized Quest sales agent or our Quest European Service Laboratory Foreign purchasers should contact the local Quest sales agent for details 72
71. udy feature TOFFxxx sets the study end threshold level xxx 0 to 180 TOFFON enables the study end threshold level TOFFOFF disables the study end threshold level PRTDxx yy zz sets the programmed run time duration where xx hours yy minutes zz seconds PRTDON enables the programmed run time duration feature PRTDOFF disables the programmed run time duration feature AOTvv ww XX yy Zzz sets the auto on time vv month ww day hour 0 to 24 yy minutes zz seconds AOTON enables the auto on feature AOTOFF disables the auto on feature TIMExx yy sets the clock where xx hours 0 to 24 yy minutes DATExx yy zzzz sets the calendar month yy day 2222 year 2PKx sets the weighting of the second peak detector TAKx sets the Taktmaximal period x 3 or 5 seconds SESSON enables Session mode must RESET unit first SESSOFF disables Session mode must RESET unit first returns a list of the measurement commands 5 returns a list of setup commands Function Commands OFF turns the unit off Caution unit cannot be turned on via remote control Enable Auto On with a valid date and time or use the ON OFF key to turn the unit on PRINTxxxxx returns the printout of a specific memory location 1 to 99999 to specify the memory location If X is omitted all memory locations will print PRINTSxxxxx returns the printout of a specific session if the meter is in S
72. ues allowed for logging interval y H Mor S for hours minutes or seconds LMEMx Enables or disables logging to internal memory x 0 for off x 1 for on LCOMx Enables or disables logging to the COMM port x 0 for off x 1 for on BAUDxxxxx sets the baud rate for serial communications xxxxx 1200 2400 4800 9600 or 19200 PRLL sets communications for a parallel printer FLOWx enables or disables flow control for 5 232 x for Hardware x S for Software x for none EOLxx sets the end of line character for serial communications either carriage return line feed or a combination of the two xx C CL L or LC where C carriage return and 1 line feed PRNxy sets the items to print for header x 5 for summary x T for time history x F for filter grouping x for printing location data along with a session summary y Y to enable y N to disable Ie ERX sets the exchange rate x 3 4 5 or 6 THxxx sets the integration threshold xxx 0 to 180 THON enables the integration threshold THOFF disables the integration threshold LNxyy sets the exceedance levels of interest 1 2 3 or 4 to select which exceedance level to set 1 to 99 to set the percent value TONxxx sets the study trigger threshold for beginning a study xxx 0 to 180 37 XX 38 TONON enables the threshold triggered study feature TONOFF disables the threshold triggered st
73. uest Model OB 100 Octave Filter and OB 300 1 3 1 1 Octave Filter are plug in modules containing a bandpass filter with a selectable center frequency The OB 100 meets the most stringent requirements of ANSI 1 11 1986 and IEC R225 1966 for octave band filters The OB 100 is a full octave bandwidth active filter with ten selectable center frequencies from 31 5 Hz to 16 kHz The OB 300 meets the most stringent requirements of ANSI 1 11 1986 and IEC R225 1966 for octave and third octave band filters The OB 300 is an active filter with 33 selectable center frequencies from 12 5 Hz to 20 kHz when in the 1 3 mode and 11 selectable center frequencies from 16 Hz to 16 kHz when in the 1 1 mode The filters may be operated manually or can automatically step through each consecutive band at a user selectable rate Primary uses include frequency analysis for product noise emission material acoustics community noise audiometer calibration and analysis of audiometric rooms 10 ABOUT THE FILTER 10 1 Filter Controls POWER Switch three position slide switch OFF Disconnects the filter circuitry from the attached sound level meter With this switch in the off position the filter does not use power from the meter batteries MANUAL Filter frequency selection is performed with two push buttons START Buttons E and E AUTO Unit automatically cycles through the desired filter frequencies while storing sample information for each frequen
74. wn in Figure 14 to correct for the effect of the background noise on the measurement 46 5 4 Wind Screen Effects T prevent measuring errors caused by w i n d blowing across the microphone the use f a windscreen als 5 recommende d The w i n d Screen w i 1 1 reduce win eel dB ERROR TO BE SUBTRACTED FROM MEASUREMENT 0 1 2 3 4 5 6 7 8 9 dB DIFFERENCE BETWEEN MEASUREMENT AND BACKGROUND NOISE Figure 14 Effect of Background on Measurement d effects and will also help protect the microphone under dusty oily or humid conditions Acoustic attenuation effects of the WS 7 for 592 mic and the WS 3 for 1 inch mic windscreens are shown in Figure 15 1 xa a ES c 2 vo zo ow aa 1 es gt gt om 4 uo WS 7 HALF INCH wS 3 DNE INCH 100 200 500 lk 2k Sk 10k 20k FREQUENCY Hz Figure 15 Acoustic Effect of Windscreens 47 6 TECHNICAL INFORMATION 6 1 Principles of Operation The Quest Model 1900 uses low noise low power circuitry to ensure long battery life maximum stability and superior reliability over a wide range of environmental conditions internal operations Figure 16 is a block diagram of the 1900 s MICROPHONE D SIGNAL V PREAMP GND BUFFER POLARIZATION SWITCH
75. y in front of the microphone diaphragm Normal line extending from the center of the microphone diaphragm Detector True RMS Detector Pulse Range 63 dB Detector Measuring Range 40 dB from the lower range limit when measuring a signal with a 20 dB Crest Factor The extra 20 dB 40 to 60 on top of the measuring range produces the 20 dB Crest Factor capability Primary Indicator Range Linearity Range 60 dB The range as shown by the Range Indicators on either side of the bargraph Tested with a sinusoidal signal input Level Linearity Inside the Primary Indicator Range is tested on the Reference Range 60 to 120 dB with a sinusoidal input Signal Tolerance is 0 7 dB referenced to 94 dB Overload Indication OL in the display indicates a momentary overload while viewing SPL OL stays lit while viewing data from a study Attenuator Accuracy Referred to the Reference Range and the Reference SPL Within 0 5 dB from 31 5 Hz to 8 kHz Within 1 0 dB from 20 Hz to 12 5 kHz Warm up Time 30 seconds Integration Time Settling Time 1 minute when measuring a short impulse 5 seconds when integrating a constant input signal Accuracy Within 0 5 dB at 25 Within 1 0 dB over the temperature range of 10 to 50 2nd Peak Detector within 1 5dB from 40 to 10dB relative to the top of the measurement range Memory Capacity Standard 128K allows logging of 5 quantities at 1 second intervals for up to 4
76. y is stored in a consecutively numbered Memory Location which is displayed briefly at the beginning of each study Consecutive studies may be grouped into a File When printing data each File will have its own individual header which makes it easier to locate related groups of data in the printout Alternately place the meter in Session Mode to create a cummulative summary of the data from consecutive studies with identical measuring parameters 65 12 Up to five quantities may be logged at user defined time intervals Final summary data for all measured quantities is also stored for each study The study may be initiated and ended in several ways refer to Figure Manual Study Press RUN PAUSE to begin a study causing the RUN NOTE indicator to light will be displayed briefly where X is the number of the current memory location Press RUN PAUSE again to end the study causing the PAUSE indicator to light During a study pressing a key to change a parameter such as weighting range or response time will stop the current study and after a brief settling time begin a new study Manual Timed Study Press RUN PAUSE to begin a study If a Programmed Run Time duration has been set and enabled in the Parameter PARA setup menu the study will run for this time duration and automatically stop The study may be interrupted by pressing the PAUSE key Auto Timed Study An Auto ON time and date must be se
77. y of data acquisition devices Refer to Figure 13 Chart Recording of SPL Connect the Model 1900 to the chart recorder input Observe proper polarity Use a 1 kHz acoustic calibrator preferably 94 dB to calibrate the chart recorder as follows 159 Turn the meter to Set the meter RESPONSE to FAST and RANGE to 80 140dB NOTE If an adapter is needed to mate the microphone size to the calibrator coupler insert it fully into the calibrator 2 Place the calibrator fully onto the microphone with the calibrator turned off The meter should read less than 80 dB which provides 0 volts DC at the DC output Adjust the zero control on the recorder so that the pen indicates a relative dB of 0 Sz Turn the Calibrator ON to produce 94 dB or the level specified on the label at 1 kHz Set the 1900 dB RANGE for the highest bar graph level without causing an overload The recorder pen should rise to the correct relative dB 54 if the calibrator level is 94 dB and the dB RANGE is set to 40 to 100 A small adjustment may be needed Use the zero adjust to do this 4 Be sure to document all chart recorder settings and meter settings when taking measurements Note that any range position can be set on the Model 1900 and the 60 dB span of the meter range will always correspond to the full 60 dB range on the chart recorder Quest Chart paper 4 58 653 has a 60dB scale and will 42 provide an easy to recording

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