Radio Shack Sound Level Meter Manuel utilisateur

Owner’s Manual

Please read before using this equipment.

Sound Level Meter

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Contents

Introduction ......................................... 3

Specifications ...................................... 5

Installing a Battery .............................. 7

Controls ................................................ 9

Range ............................................ 9

Output .......................................... 10

Response ..................................... 10

Weighting ..................................... 11

Microphone .................................. 12

Tripod Adapter ............................. 12

Cal (Calibration) ........................... 13

Measurements ............................. 13

Checking Noise Levels ................. 16

Checking Room Acoustics ........... 17

RadioShack and RadioShack.com are trademarks used

by Tandy Corporation.

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Introduction

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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. You can use it to

measure noise levels in factories, schools,

offices, and airports, or to check acoustics

of 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 and

make an acoustic analysis.

Slow And Fast Response Settings — let

you check peak and average noise levels.

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4Introduction

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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Specifications

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Specifications

Range:

Accuracy ............................... ± 2 dB @ 114 dB

Standard ........................... 0 dB = 0.0002 μbar

Weighting ........................................... A and C

Response...................................Fast and Slow

Signal Output ................................. 1.0V(peak)

minimum into open circuit,

with full-scale 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

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6Specifications

Battery ................................................. One 9V

Battery Check ................ Tests “good” from 7.0

to 10.5V

Expected Battery Life ......... 110 working hours

(alkaline battery)

Size (HWD) .............. 5/16 ×27/16 ×13/4Inches

(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.

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Installing a Battery

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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.

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

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8Installing a Battery

To test the battery, set RANGE to BATT. If

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.

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.

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Controls

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Controls

RANGE

The RANGE selector lets you select one of

seven sound level ranges, each spanning

16 dB. The RANGE numbers refer to the

center points of the seven ranges. The

needle level 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

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10 Controls

OUTPUT

The phono-type OUTPUT jack lets you

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.

Note: The meter response will not be flat,

due to the A- and C-weighting networks.

Set RANGE so the maximum needle de-

flection is never greater than +4, to pre-

vent 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, showing you the peak sound

levels present in the environment. In the

SLOW position, the meter is damped and

indicates an average-value sound level.

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