Manual for Data Logging Class 2 Sound Level Meter
Contents
1. 3 show kinds of Excel presentations a data only screen and a graphics only screen Al 5 O f Place A B c D E d 1 Place Ipate Time Value Unit 2 1 2009 10 16 16 47 05 60 8 dB N 3 2 2009 10 16 16 47 07 66 9 dB S 4 3 2009 10 16 16 47 09 68 8 dB 5 4 2009 10 16 16 47 11 71 dB Mam 6 5 2009 10 16 16 47 13 82 3 dB A 7 6 2009 10 16 16 47 15 92 3 dB aie ey 8 7 2009 10 16 16 47 17 93 1 dB 9 8 2009 10 16 16 47 19 93 1 dB 10 9 2009 10 16 16 47 21 89 8 dB 11 10 2009 10 16 16 47 23 90 2 dB 12 11 2009 10 16 16 47 25 89 9 dB 13 12 2009 10 16 16 47 27 93 2 dB 14 13 2009 10 16 16 47 29 90 7 dB APPR PPERP PPMP PPPS PS PIEP PPP OPP PMP a TH R EEES E LLLLEELEEEIEPEEPD PEELE PEELS 16 15 2009 10 16 16 47 33 86 2 dB jao Fig 3 Typical Excel Fig 2 Typical Excel data only screen graphics only screen SPECIFICATIONS Embedded microcontroller Custom one chip LSI device Display type Liquid crystal with green backlight Display size 2 05 x 1 5 in 52 x 38mm Parameter measured dB Frequency range 31 5 Hz to 8 kHz Measurement range 30 to 130 dB in autoranging mode user can also select fixed range of 30 to 80 dB 50 to 100 dB or 80 to 130 dB Measurement weighting By frequency and time frequency weighing uses A or C standard time weighting is fast or slow 200 ms or 500 ms response time Measurement accuracy With A frequency weighting 3 5 dB 31 5 Hz 2 5 dB 63 Hz 2 dB 125 Hz 1 9 d2. not limited to any claims for loss of profits RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality However in the event your instrument requires repair please contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools amp Instruments 80 White Street New York NY 10013 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail address Specialty Tools amp Instruments GENERAL TOOLS amp INSTRUMENTS 80 White Street New York NY 10013 3567 PHONE 212 431 6100 FAX 212 431 6499 TOLL FREE 800 697 8665 e mail sales generaltools com www generaltools com DSM402SD User s Manual Specifications subject to change without notice 2010 GENERAL TOOLS amp INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN DSM402SD 12 03 10
3. on the bottom of the meter The meter s default settings are auto ranging on enabling measurements from 30 to 130 dB A frequency weighting and fast time weighting Accordingly when the meter is powered on the display will show the following A Fast Auto Following are procedures for changing each of these parameters to suit the application If you already know that the volume of the machinery or environment you are measuring is within a limited range you may want to exit autoranging mode the meter s default setting and manually enter and use a specific measurement range 1 To use a specific measurement range press the A button which has the word Range stenciled above it once The display will then show the first of the three range options 30 80 representing a full scale range of 30 to 80 dB Press the A button again and the display will show the second option 50 100 Press the A button again and the display will show the third option 80 130 Press the REC ENTER button to select and store this range The shape of the A frequency weighting curve simulates the response of the human ear and is therefore the better choice for measuring the sound level of an environment By comparison the C weighting curve is flatter and is therefore better for measuring the sound level of a piece of machinery 2 To switch from A frequency weighting the meter s default setting
4. the cover Remove the batteries when storing the meter for an extended period of time Do not drop or disassemble the meter or immerse it in water OPTIONAL ACCESSORIES Optional accessories available from General Tools amp Instruments include e 94 dB or 94 114 dB sound calibrator 9VDC adapter for a 110V power supply WARRANTY INFORMATION General Tools amp Instruments General s DSM402SD Sound Level Meter with Datalogging SD Card is warranted to the original purchaser to be free from defects in material and workmanship Subject to certain restrictions General will repair or replace this instrument if after examination the company determines it to be defective in material or workmanship for a period of one year This warranty does not apply to damages that General determines to be from an attempted repair by non authorized personnel or misuse alterations normal wear and tear or accidental damage The defective unit must be returned to General Tools amp Instruments or to a General authorized service center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product In no event shall General be liable for any incidental special consequential or punitive damages or for any cost attorneys fees expenses or losses alleged to be a consequence of any damage due to failure of or defect in any product including but
5. 11 Calibration screw 1 16 Kickstand 1 5 A button 1 12 RS 232 output jack 1 17 Battery compartment 1 6 V button 1 13 Socket for 9VDC oe 1 7 SET button AC adapter 1 18 SD card socket 4 SETUP 1 Choose the power source Before using the DSM402SD be sure it is powered by fresh batteries or an optional 9VDC AC adapter plugged into the bottom jack on its right side callout 1 13 To remove the battery compartment cover callout 1 17 remove the two screws holding it in place callout 1 15 Then install six AA batteries in the correct orientation using the polarity marks on the inside of the compartment as a guide Replace the cover by replacing the two screws 2 Install an SD card To prepare for setup also install the supplied 2 GB SD memory card or another card with a capacity from 1 GB to 16 GB in the socket on the bottom of the meter callout 1 18 When installing the card make sure its gold contacts are facing front and push the card into the socket until you hear a click To remove the card push it in until you hear a click and the card pops out Now power on the instrument by pressing the POWER ESC button callout 1 2 to generate a short beep To power off the DSM402SD press the POWER button and hold it until the instrument responds with a long beep When the meter powers on a series of transient startup screens will briefly appear Once the display has stabilized perform the following six setup steps in the order p
6. B 250 Hz 1 9 dB 500 Hz 1 4 dB 1 kHz 2 6 dB 2 kHz 3 6 dB 4 kHz 5 6 dB 8 kHz Measurement resolution 0 1 dB Sampling time options 0 1 2 5 10 30 60 120 300 600 1800 or 3600 seconds 0 seconds to 1 hour Settable parameters Date time auto power off beep sound sampling time decimal point or comma decimal division A or C frequency weighting fast or slow time weighting Storable recallable readings Maximum minimum SD card capacity 1 GB to 16 GB Operating temperature 32 to 122 F 0 to 50 C Operating relative humidity 0 to 85 Power source 6 Alkaline AA batteries or optional 9 VDC AC adapter Power consumption 8 mADC normal operation with backlight off and SD card not saving data 30 mADC with backlight on and card saving data 44 mADC with backlight on and card saving data Dimensions of meter 9 65 x 2 68 x 1 77 in 245 x 68 x 45mm Weight of meter 1 08 Ib 489g MAINTENANCE TIPS When the icon _X_ appears in the left corner of the display it s time to replace the six AA batteries that power the instrument although measurements will remain valid for several hours after the low battery indicator first appears Replacing the batteries requires removing the two screws that hold the battery compartment cover in place as explained in step 1 of the setup procedure After inserting fresh batteries in the correct orientation tighten the screws to secure
7. GENERAL DSM402SD USER S MANUAL Font thaw ask Hd S0 Cord Data Logger SOUND LEVEL METER GENERAL Mites SOUND LEVEL METER WITH DATALOGGING SD CARD Please read this manual carefully and thoroughly before using this product TABLE OF CONTENTS IntrOduCHON suerte ees 3 Key Features eso a sceceaire See Se Sra ke a a arta rales 3 Operating Instructions 00000s 4 9 What s in the Case 0cceee ee eeeee 4 SEUD saciviedeses veer tere teweteweees 5 6 Calibrating the Meter 5 6 7 Normal Operation 00000005 7 8 Holding and Storing Measurements 8 Automatic vs Manual Datalogging 8 9 Transferring Data from the SD Card to a Computer 5 02565 tel eco ees ees 9 Specifications aeret eerren rreka arate Sard 10 Maintenance TipS 000ecee eee enenees 11 Optional AccessorieS c00ceeeeeeeneees 11 Warranty Information 000ceeeeaes 11 Return for Repair Policy 0000eeaee 11 INTRODUCTION Thank you for purchasing General Tools amp Instruments DSM402SD Sound Level Meter with Datalogging SD Card Please read this user s manual carefully and thoroughly before using the instrument The DSM402SD is a general purpose handheld instrument that measures the noise level of an environment or the sound level produced by a piece of machinery Using an integrated 0 5 in condenser microphone the meter can measure sound levels from 30 to 130 dB
8. econd 3 600 seconds one hour To view the sampling time that the instrument has been set up to use press the W button which has the words Sampling check stenciled below it once To change the sampling time perform Step 7 of the setup procedure 1 To start automatic datalogging press the REC ENTER button once The top line of the display will show the term REC Pressing the LOGGER button at this point will make REC flash and add the flashing term LOGGER at the top right of the display This indicates that the instrument is currently storing measured values and their time stamps in memory 2 To pause automatic datalogging press the LOGGER button once this action makes the flashing term LOGGER disappear from the top right of the display and changes the term REC from flashing to constant Pressing the LOGGER button again resumes 7 automatic datalogging 3 To end automatic datalogging press the REC ENTER button and hold it for at least two seconds This action causes the REC message to disappear 4 To log data manually set the sampling time to zero using Step 7 of the setup procedure Then press the REC ENTER button once The display will show the term REC on the top line a value in the middle and below it the letter P on the left and a number from 1 to 99 on the same line to the right The number indicates the position on the SD card that will be used to store manually logged data Now
9. et the date and time the display will show the word bASIC above the phrase dEC Press the W or A button to make bASIC American style or Euro appear in the upper display as desired Press the REC ENTER button to store the selection as the default 5 Enable or disable auto power off Once the format of decimal point divisions has been set and stored the display will show the word yES over the term PoFF Press the W or A button until the desired automatic power off management scheme yES for enable no for disable is displayed Press the REC ENTER button to store the selection If enabled the power off function shuts off the DSM402SD after a period of inactivity of ten minutes 6 Enable or disable the beeper Once the auto power off function has been enabled or disabled the display will show the word yES over the word bEEP Press the W button until the desired setting yES or no is displayed and then press the REC ENTER button to store the selection as the default 7 Set the datalogging sampling time Once the beeper has been enabled or disabled the display will show a value above the letters SP t Press the W or A button to decrease or increase the value until the desired sampling time appears above SP t The options are 0 1 2 5 10 30 60 120 300 600 1800 and 3600 seconds 0 seconds to 1 hour 8 Format the SD card Once the sampling time has bee
10. ich is on by default by briefly pressing but not holding the POWER ESC button To reactivate the backlight briefly press the button again HOLDING AND STORING MEASUREMENTS 1 To hold a measured value press the HOLD NEXT button during the measurement Doing so will cause the word HOLD to appear at the top of the display Pressing the HOLD NEXT button again releases the hold 2 To record and recall readings press the REC ENTER button while making measure ments This will make the term REC appear at the top of the display Pressing the REC ENTER button again briefly will make the term MAX appear to the right of REC and switch the display to the maximum value stored in memory during the last recording session Pressing the REC ENTER button again briefly will make the term MIN appear to the right of REC and switch the display to the minimum value stored during the last session 3 To hold a maximum reading press the LOGGER button which has the words Peak Hold stenciled below it while in recording mode To release the hold press the LOGGER button again 4 To exit recording mode press the REC ENTER button and hold it for at least three seconds until the term REC disappears from the top line of the display The display will then revert to showing the current reading AUTOMATIC VS MANUAL DATALOGGING The DSM402SD can automatically log data at a user selected sampling period from 1 s
11. imum readings and holds any reading e Performs automatic datalogging at sampling time settable from 1 second to 9 hours e Also supports manual logging and changing of card storage location e Outputs Excel compatible data logs e Accepts SD memory cards of up to 16 GB capacity e Auto power off function e Powered by six AA batteries or optional 9V AC DC adapter OPERATING INSTRUCTIONS WHAT S IN THE CASE The DSM402SD comes fully assembled in a hard carrying case along with a sound wind shield ball a 2 GB SD memory card and this user s manual Optional accessories available from General Tools amp Instruments include a 94 dB or 94 114 dB sound calibrator and a 9VDC adapter for a 110V power supply See the Optional Accessories section of this manual on p 11 for more details Figure 1 shows all of the controls and indicators on the front right side back and bottom of the DSM402SD Familiarize yourself with the positions and functions of these controls indicators and connectors before moving on to the setup procedure TOP FRONT 4 15 4 4 4 3 1 14 1 16 ve 14 4 17 4 5 18 4 10 4 7 4 8 Tu 4 13 BOTTOM tae 1 18 SIDE A Fig 1 The DSM402SD s controls and indicators and other physical features 1 1 Liquid crystal display 1 8 LOGGER button 1 14 Tripod attachment nut 1 2 POWER ESC button 1 9 Microphone 1 15 Battery compartment 1 3 HOLD NEXT button 1 10 AC output terminal cover Screws 1 4 REC ENTER button 1
12. n set and stored the term Sd F will appear in the lower half of the display Press the REC ENTER button Pressing the REC ENTER button causes the word no or yES to appear over the term Sd F Press the W button to make a selection Choose yES whenever a new SD card is being used or when a used card is being repurposed from use with another SD card instrument or a camera for example and all data on it is to be erased Choose no to preserve any data on a card previously used with this instrument If you choose yES after you press the REC ENTER button the instrument will prompt you to confirm that decision by displaying the term Ent below yES and sounding three beeps To confirm that you want to begin the erasure formatting procedure press the REC ENTER button Ent will then flash several times and the instrument will sound another three beeps to confirm that the SD card has been erased and formatted Once the SD card has been formatted or not the display will then either return to the first of the six steps in the setup sequence setting the current date and time or show the term ESC If ESC appears press the POWER ESC button to exit the setup procedure and enter normal operating mode CALIBRATING THE METER The DSM402SD must be calibrated before it can make accurate sound level measurements 1 To prepare for calibration obtain an optional sound calibrator and ma
13. press the LOGGER button This will cause the beeper to sound and the term LOGGER to briefly appear at the upper right of the display As in automatic datalogging mode in this mode the instrument is storing measurements and their time stamps on the SD card In manual datalogging mode however measurements are being stored continuously with a sampling time of zero and their locations on the card can be changed 5 To change the storage location of manually logged data press the W button once this causes the P to disappear from the left side of the display and the value on its line to begin flashing Once the flashing begins you can use the W and A buttons to change the flashing value to any number between 1 and 99 Once you have chosen the storage location press the REC ENTER button to save the setting This causes the value to stop flashing and the P to return 6 To end manual datalogging press the REC ENTER button and hold it for at least three seconds This action causes the REC message to disappear from the top line of the display TRANSFERRING DATA FROM THE SD CARD TO A COMPUTER After automatic or manual datalogging of measurements remove the SD card from the meter and plug it into your computer either directly if it has an SD card slot or through an SD card reader Because the files containing time stamped data logs have the file extension xls they open in Microsoft s Excel application Figures 2 and
14. resented 3 Set the date and time Press the SET W button callout 1 5 and hold it for at least five seconds until the word dAtE appears in the center of the display y along with the flashing value 00 00 00 at the lower left above yy mm dd Set the current year by pressing the W or A button repeatedly until the correct value appears above yy Quickly within three seconds press the REC ENTER button to store the setting The next screen that appears will have the value above mm flashing Use the Vv or A button to navigate to the current month and press the REC ENTER button to store the setting When the next screen flashes the value above dd again use the W or A button to navigate to the current day and press the REC ENTER button to store the setting If you press buttons too slowly in setup mode the screen will revert to the normal display To return to the setup sequence press and hold the SET button again To move ahead to the next field in the sequence or to the next parameter press the HOLD NEXT button Once you have set the date the display will prompt you to set the hour minute and second of the current time Again use the W or A button to navigate to the correct values and the REC ENTER button to store the settings 4 Choose a decimal point or comma to represent the decimal division between integers and fractions for example American style 20 88 vs European style 20 88 Once you have s
15. te its output connector with the head of the DSM402SD s microphone callout 1 9 of Fig 1 Power on the sound calibrator and manually set its range to 50 to 100 dB 2 On the DSM402SD manually set its range to 50 to 100 dB as well by pressing the A button which has the word Range stenciled above it once The display will then show the first of three range options 30 80 Press the A button again and the display will show the second option 50 100 Press the REC ENTER button to select and store this range 3 Press the SET button on the DSM402SD callout 1 7 of Fig 1 which has the term Fast slow stenciled below it Press either the W or A button until the word FAST appears on the display Press the REC ENTER button to select and store this setting as the temporary default 4 Press the A button on the DSM402SD which has the term A C stenciled above it Press either the W or A button until the display shows the term A Fast Manual Then press the REC ENTER button to select and store this setting as the temporary default 5 To calibrate the DSM402 set the output of the sound calibrator to 94 dB and carefully turn the calibration screw on the right side of the meter callout 1 11 of Fig 1 until the display shows the following 94 0 2 dB NORMAL OPERATION To prepare to make sound level measurements power on the DSM402SD and make sure an SD card is firmly seated in the socket
16. to C weighting press the A button which has the term A C stenciled above it Then press either the VW or A button until the display shows the term C Fast Manual or C Fast Auto Finally press the REC ENTER button to select and store C weighting as the temporary default The third sound measurement parameter you can change is the meter s response time Fast time weighting with a response time of 200 ms simulates the response time of the human ear and is better for measuring the volume of singular events Slow weighting with a response time of 500 ms is a better choice when you wish to measure the average sound level that an ongoing process such as the vibration of a machine produces over time 3 To switch from fast time weighting the meter s default setting to slow time weighting press the SET button which has the term Fast slow stenciled below it Press either the W or A button until the word SLOW appears on the display Press the REC ENTER button to select and store this setting as the temporary default Once you have set these three parameters or kept the meter s default settings you are ready to make sound level measurements 4 To make a sound level measurement point the condenser microphone at the top of the meter in the direction of the sound source The display will show its volume in dB units Whenever the meter is in measurement mode you can turn off the backlight wh
17. with a resolution of 0 1 dB and show the results on a front panel liquid crystal display Several features and capabilities enhance the meter s versatility Among them are autoranging the ability to hold readings and display maximum and minimum readings and user settable measurement parameters such as frequency weighting using the A and C standards and time weighting fast or slow The DSM402SD can be calibrated by an optional laboratory instrument Because it is microprocessor based the DSM402SD can make full use of the portability reliability and large storage capacities that SD memory cards offer Measurements can be made automatically at any sampling rate between one second and one hour After time stamping and storing the measurements on an SD card plugged into the instrument a process called datalogging the user can remove the card and plug it into to a laptop or desktop computer either directly or via a USB card reader The data logs are stored on the card as files with the xls extension which can be opened by Microsoft s Excel application The DSM402SD has a backlit 2 1 2 in diagonal display and is powered by six AA Alkaline batteries or an optional 9V AC DC adapter KEY FEATURES e Measures sound levels of machinery or an environment e Big 2 5 in diagonal front panel green backlit LCD is easy to read e Makes measurements in autoranging mode or within a manually settable range e Displays maximum and min
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