Related Manuals for Radio Shack Sound Level Meter
Summary of Contents for Radio Shack Sound Level Meter
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Page 1: Sound Level Meter
33-2050.fm Page 1 Monday, April 17, 2000 2:04 PM Sound Level Meter... -
Page 2: Table Of Contents
33-2050.fm Page 2 Monday, April 17, 2000 2:04 PM ˆ Contents Introduction ......... 3 Specifications ........5 Installing a Battery ......7 Controls ..........9 Range ..........9 Output .......... 10 Response ........10 Weighting ........11 Microphone ........12 Tripod Adapter ...... -
Page 3: Introduction
33-2050.fm Page 3 Monday, April 17, 2000 2:04 PM ˆ Introduction Your RadioShack Sound Level Meter is an extremely versatile device for measur- ing sound intensity in just about any acoustic environment — loud or soft; high- pitched, low-pitched, or broad-band; inter- mittent or continuous. - Page 4 33-2050.fm Page 4 Monday, April 17, 2000 2:04 PM Built-in Battery Condition Indicator — 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.
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Page 5: Specifications
33-2050.fm Page 5 Monday, April 17, 2000 2:04 PM ˆ Specifications Range: 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 Accuracy ....... - Page 6 33-2050.fm Page 6 Monday, April 17, 2000 2:04 PM Battery ..........One 9V Battery Check ....Tests “good” from 7.0 to 10.5V Expected Battery Life ..110 working hours (alkaline battery) × 2 × 1 Size (HWD) ....Inches (160 × 62 × 44 mm) Weight ...........
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Page 7: Installing A Battery
33-2050.fm Page 7 Monday, April 17, 2000 2:04 PM ˆ Installing a Battery Your meter requires one 9V battery (not supplied) for power. For the best perfor- mance and longest life, we recommend a RadioShack alkaline battery. Caution: Use only a fresh battery of the required size and recommended type. - Page 8 33-2050.fm Page 8 Monday, April 17, 2000 2:04 PM To test the battery, set . If RANGE BATT the meter shows a reading in the red BATT TEST region, the battery is still good. Replace the batteries when the reading is in any other region or the meter stops operating.
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Page 9: Controls
33-2050.fm Page 9 Monday, April 17, 2000 2:04 PM ˆ Controls RANGE SLOW FAST RESPONSE Level Indicator OUTPUT WEIGHTING RANGE selector lets you select one of RANGE seven sound level ranges, each spanning 16 dB. The numbers refer to the RANGE center points of the seven ranges. -
Page 10: Output
33-2050.fm Page 10 Monday, April 17, 2000 2:04 PM OUTPUT The phono-type jack lets you OUTPUT connect the meter to recording or other measurement equipment. For example, you might use an audio patch cord to con- nect the meter to the AUX or high-level in- put of a recorder. -
Page 11: Weighting
33-2050.fm Page 11 Monday, April 17, 2000 2:04 PM The effect of brief sound peaks is mini- mized in the position. SLOW WEIGHTING to weight the sound mea- WEIGHTING surement for a particular frequency range. When set to , 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. -
Page 12: Microphone
33-2050.fm Page 12 Monday, April 17, 2000 2:04 PM MICROPHONE The meter’s built-in microphone works best when you point it directly at a sound source. TRIPOD ADAPTER You can mount the meter on a camera tri- pod (standard –20 thread) to eliminate hand noise and minimize the effects of sound reflected from your body. -
Page 13: Cal (Calibration)
33-2050.fm Page 13 Monday, April 17, 2000 2:04 PM CAL (CALIBRATION) Your meter has been accurately calibrat- ed and normally will not require further ad- justment. If adjustment is necessary, take the sound meter to an audio professional who can calibrate the meter by connecting special equipment, such as a sound gen- erator, to the jack. - Page 14 33-2050.fm Page 14 Monday, April 17, 2000 2:04 PM Follow these steps to select the desired response, weighting, and range. 1. Set if the sound RESPONSE FAST source you want to measure consists of short bursts or if you want to mea- sure only peak values.
- Page 15 33-2050.fm Page 15 Monday, April 17, 2000 2:04 PM While taking measurements, minimize the effect of your body’s presence. When the sound 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...
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Page 16: Checking Noise Levels
33-2050.fm Page 16 Monday, April 17, 2000 2:04 PM CHECKING NOISE LEVELS This chart, gathered from Federal, State, and local agencies, shows standards for acceptable noise levels. Sound Level (dB) Maximum (A-weighting, Duration per Day SLOW response) (hours) or less Permissible noise exposures. -
Page 17: Checking Room Acoustics
33-2050.fm Page 17 Monday, April 17, 2000 2:04 PM To use your meter to check noise levels, WEIGHTING RESPONSE . Take measurements at several SLOW points in the test area, with the meter posi- tioned properly. Average dB levels of some common activities. - Page 18 33-2050.fm Page 18 Monday, April 17, 2000 2:04 PM Depending on the speaker placement, standing waves might also develop in the room, giving your system a “peaky”, ec- centric response. To determine a room’s acoustics, analyze the acoustics with your meter and a suit- able test recording.
- Page 19 33-2050.fm Page 19 Monday, April 17, 2000 2:04 PM Note: When checking the frequency re- sponse, if is set to , the WEIGHTING meter’s frequency response is flat from 32 –10,000 Hz (± 3 dB). Above 10 kHz, the frequency response of the meter drops off rapidly.
- Page 20 33-2050.fm Page 20 Monday, April 17, 2000 2:04 PM Limited Ninety-Day Warranty This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal use for ninety (90) days from the date of purchase from RadioShack company- owned stores and authorized RadioShack franchisees and dealers.
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