Radio Shack Sound Level Meter User Manual Download

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Sound Level Meter

33-2050.fm Page 1 Monday, April 17, 2000 2:04 PM

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Summary of Contents for Sound Level Meter

Page 1: ...Owner s Manual Please read before using this equipment Sound Level Meter 33 2050 fm Page 1 Monday April 17 2000 2 04 PM ...

Page 2: ...onse 10 Weighting 11 Microphone 12 Tripod Adapter 12 Cal Calibration 13 Measurements 13 Checking Noise Levels 16 Checking Room Acoustics 17 2000 Tandy Corporation All Rights Reserved RadioShack and RadioShack com are trademarks used by Tandy Corporation 33 2050 fm Page 2 Monday April 17 2000 2 04 PM ...

Page 3: ...studios auditoriums and home theater installations Your meter features a large easy to read indicator for taking quick measurements The meter uses a 9V battery not sup plied which allows you to use it any where The meter s other features include Seven Sound level Ranges allow measurements form 50 126 dB refer enced to 0 0002 μbar A And C Weightings lets you check compliance with safety regulations...

Page 4: ...cator lets you check the battery condition Phono type Output Jack for connec tion to home theater or test equipment Threaded Insert lets you attach the meter to a camera tripod for increased ac curacy 33 2050 fm Page 4 Monday April 17 2000 2 04 PM ...

Page 5: ... meter deflection at 1 kHz Load Impedance 10k Ohm minimum Distortion Less than 2 at 1 kHz 0 5V Microphone Electret condenser omnidirectional becoming slightly directional with increase in frequency Switch Setting Range of Measurement 60 dB 50 66 dB 70 dB 60 76 dB 80 dB 70 86 dB 90 dB 80 96 dB 100 dB 90 106 dB 110 dB 100 116 dB 120 dB 110 126 dB 33 2050 fm Page 5 Monday April 17 2000 2 04 PM ...

Page 6: ...d Battery Life 110 working hours alkaline battery Size HWD 5 16 27 16 13 4 Inches 160 62 44 mm Weight 6 6 oz 185 g Specifications are typical individual units might vary Specifications are subject to change and improvement without notice 33 2050 fm Page 6 Monday April 17 2000 2 04 PM ...

Page 7: ...e only a fresh battery of the required size and recommended type Follow these steps to install the battery 1 Press both sides of the battery com partment cover and lift it Note The battery compartment cover cannot be removed 2 Place the battery in the compartment as indicated by the polarity symbols and marked inside 3 Close the cover Press both sides 33 2050 fm Page 7 Monday April 17 2000 2 04 PM...

Page 8: ...egion or the meter stops operating Warning Dispose of old batteries promptly and properly Do not burn or bury them Caution If you do not plan to use the meter for a week or more remove the bat teries Batteries can leak chemicals that can destroy electronic parts Note Leave RANGE in the OFF position when the meter is not in use to conserve battery power 33 2050 fm Page 8 Monday April 17 2000 2 04 P...

Page 9: ...el indicator shows the actual sound level as a displacement from the center point For example if RANGE is set to 80 and the meter scale reads 3 the actual sound level is 77 dB 80 3 If the meter scale reads 0 same as the value where RANGE is set the actual sound level is 80 dB 80 0 RANGE Level Indicator CAL OUTPUT SLOW FAST RESPONSE A C WEIGHTING 33 2050 fm Page 9 Monday April 17 2000 2 04 PM ...

Page 10: ...nt the built in amplifier from clipping Use A weighting for voice recordings or C weighting for full range musical materi al The OUTPUT jack can also be connect ed to high impedance headphones or an oscilloscope a frequency analyzer or oth er test equipment RESPONSE The RESPONSE selector has two settings FAST and SLOW In the FAST position the meter reacts quickly to changes in the sound level show...

Page 11: ...the meter primarily mea sures frequencies in the 500 10 000 Hz range which is the area of greatest sensi tivity to the human ear When set to C the meter measures uniformly over the fre quency range from 32 10 000 Hz giving an indication of the overall sound level Typical A and C weighted response curves A weighted with random incidence 33 2050 fm Page 11 Monday April 17 2000 2 04 PM ...

Page 12: ...nd source TRIPOD ADAPTER You can mount the meter on a camera tri pod standard 1 4 20 thread to eliminate hand noise and minimize the effects of sound reflected from your body This makes it easy to use the meter with auxil iary recording or test equipment 33 2050 fm Page 12 Monday April 17 2000 2 04 PM ...

Page 13: ... directly between you and the sound source as this might produce an error of sev eral decibels in the frequency range above 100 Hz Position the meter so an imaginary line between you and the meter is perpendicular to a line between the meter and the sound source Handle the meter carefully The microphone and meter movement are fragile and might be damaged if the instrument is dropped Do not oper at...

Page 14: ... to measure sound levels of musical material 3 Set RANGE to the highest setting 120 dB then adjust it downward until there is significant deflection of the needle For the greatest accuracy always use the lower of any two pos sible settings For example if RANGE is set to 80 dB and the meter reads 5 reset RANGE to 70 dB so the meter reads 3 for an actual sound level of 73 dB Important For meaningful...

Page 15: ...nd is coming mainly from one direc tion the level reading might be significant ly affected by reflections from your body For the most accurate readings and the best polar response point the meter s mi crophone toward the sound source when possible 33 2050 fm Page 15 Monday April 17 2000 2 04 PM ...

Page 16: ...rtment of Labor Noise Regu lations Noise is inevitable in almost any environ ment Depending on the level and dura tion noise can be a minor irritant a definite disturbance or even a threat to your hearing Sound Level dB A weighting SLOW response Maximum Duration per Day hours 90 8 92 6 95 4 97 3 100 2 102 11 2 105 1 110 1 2 115 1 2 or less 33 2050 fm Page 16 Monday April 17 2000 2 04 PM ...

Page 17: ...KING ROOM ACOUSTICS The size shape and furnishings of a room can have a tremendous effect on a home theater system s performance A hard room with bare surfaces tends to exaggerate treble response sometimes giving the music a strident quality A soft room with curtains overstuffed furniture carpet and so on might reduce high fre quency response This may result a domi nant bass sound 33 2050 fm Page ...

Page 18: ...individual tones This gives you a clear idea of the frequen cy response of your total system home theater equipment and room included To smooth out the response adjust the tone controls and vary the speaker place ment To approximate the ideal flat re sponse you could add a frequency equalizer to your home theater system Your local RadioShack store carries fre quency equalizers that let you boost o...

Page 19: ...r s frequency response is flat from 32 10 000 Hz 3 dB Above 10 kHz the frequency response of the meter drops off rapidly Be sure to consider this when you use a test recording that includes tones at the extreme high end of the audio spec trum 33 2050 fm Page 19 Monday April 17 2000 2 04 PM ...

Page 20: ...period take the product and the RadioShack sales receipt as proof of purchase date to any RadioShack store RadioShack will at its option unless otherwise provided by law a correct the defect by product repair without charge for parts and labor b replace the product with one of the same or similar design or c refund the purchase price All replaced parts and products and products on which a refund i...

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