REED ST-805 Manuel utilisateur

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Model ST-805

Sound Level Meter

Instruction

Manual

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Contents

General Description....................................................................... 2

Safety Information ......................................................................... 3

Specications................................................................................ 4

Instrument Description ...............................................................5-7

Operating Precautions.................................................................. 7

Measurement Procedures .................…....................................... 8

Calibration Procedures.................................................................. 8

Battery Replacement..................................................................... 9

General Description

To ensure that you can get the most from it, we recommend that you r

ead and follow the manual carefully before use.

This unit conforms to the IEC651 type 2, ANSI S1.4 type 2 for Sound

Level Meters.

This Sound Level Meter has been designed to meet the measurement

requirements of safety engineers, health, industrial safety ofces and

sound quality control in various environments.

• Ranges from 30 to 130dB at frequencies between 31.5 Hz and 8 kHz.

• Display with 0.1dB steps on a 4-digit LCD.

• Two equivalent weighted sound pressure levels, A and C.

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Safety Information

Read the following safety information carefully before attempting to

operate or service this meter. Use this meter only as specied in this

manual; otherwise, its proper operation may be impaired.

Environmental Conditions

1. Altitude up to 2000 meters

2. Relatively humidity up to 90% R.H. max.

3. Ambient temperature: 0~40°C

Maintenance & Cleaning

1. Repairs or servicing not covered in this manual should only be

performed by qualied personnel.

2. Periodically wipe the case with a dry cloth. Do not use abrasives or

solvents on this instrument.

Safety Symbols

Meter is protected throughout by double insulation or reinforced

insulation.

When servicing, use only specied replacement parts.

Comply with EMC

For service on this or any other REED product or information on other

REED products, contact REED Instruments at info@reedinstruments.com.

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Specifications

Standard Applied: IEC651 type 2, ANSI S1.4 type 2

Frequency Range: 31.5Hz~8KHz

Measuring Level Range: 30~130 dB

Resolution: 0.1 dB

Accuracy: ±1.5 dB (under reference conditions)

Frequency Weighting: A & C

Time Weighting: Fast: 125mS: Slow: 1 sec.

Level Ranges: Lo: 30~100 dB; Hi: 60~130 dB

Display: 4-digit LCD

Display Update: 0.5 sec.

Alarm Function: “OVER” is show when input is out of range

Maximum Hold: Hold readings the Maximum Value, with decay

< 1dB/3minutes

Microphone: 1/2 inch electret condenser microphone

Calibration: Electrical calibration with the internal

oscillator (1kHz sine wave)

Auto Power Off: Meter automatically shuts down after approx.

15 minutes of inactivity

Power Supply: One 9V battery, 006P or IEC 6F22 or NEDA

1604 (included)

Battery Life: About 50 hrs. (alkaline battery)

Operating Temperature: 0 to 40°C (32 to 104°F)

Operating Humidity: 10 to 90% RH

Storage Temperature: -10 to 60°C (14 to 140°F)

Storage Humidity: 10 to 75% RH

Dimensions: 210(L) x 55(W) x 32(H) mm

Weight: 230g (including battery)

IIncludes: Batteries and carrying case

Optional Accessories: Tripod (model BS-6)

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Instrument Description

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1. Windscreen

If you operate at wind speeds over 10m/sec, please put protective

accessories in front of the microphone.

2. Display

3. Power ON/OFF Button

Turn the meter power ON/OFF

4. Backlight Button

Turn the display backlight ON/OFF

5. A-Weighting/C-Weighting Select Button A/C

A: A-Weighting. For general sound level measurements.

C: C-Weighting. For checking the low frequency content of noise.

(If the C-Weighted level is much higher than the A-Weighted level,

then there is a large amount of low-frequency noise)

6. Time Weighting Select Button F/S

F(Fast Response): For normal measurements (fast varying noise)

S (Slow Response): For checking average level of  uctuating noise

7. Level Range Select Button

Lo/Hi

LO: 30~100dB; HI: 60~130dB

When “OVER” is indicated, the meter automatically switches to the

other measurement range.

SYMBOL FUNCTION

LCD 4-digits

MAX Max. value hold

OVER Over range

F Fast response

S Slow response

A A-weighting

C C-weighting

LO Low range

HI High range

BAT Low battery

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8. MAX/HOLD Button

MAX/HOLD

The MAX Hold position is used to measure the maximum level of

sounds. The maximum measured level is updated continuously.

Pressing the button a second time will release the maximum hold

function and allow another measurement.

The Data HOLD function freezes the reading on the display.

Data HOLD Button: Press and hold the button for 2 seconds to turn

the Data HOLD function on or off.

9. Microphone

1/2-inch electret condenser microphone

10. Battery Cover

Operating Precautions

1. Wind blowing across the microphone will bring additional extraneous

noise. If using the instrument in the presence of wind, it is recom-

mended to put the windscreen on the microphone so as not to pick

up undesirable signals.

2. To achieve more accurate measurements, use an extension cable to

separate the microphone from the main body so that the effect of

unexpected sound reection can be eliminated.

3. Calibrate the instrument before operation if the instrument has not

been in use for a long period of time or was last operated under

extreme conditions.

4. Do not store or operate the instrument in high temperature and high

humidity environments.

5. Keep microphone dry and avoid severe vibrations.

6. When not in use, please take the battery out and keep the instrument

in a low humidity environment.

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Measurement Procedures

1. Turn on power and select the desired response time and weighting.

If the sound source consists of short bursts or only catching sound

peak, set response to FAST. To measure average sound, use the

SLOW setting.

Select A-weighting for general noise sound level and C-weighting for

measuring sound level of acoustic material.

2. Select desired level.

3. Hold the instrument comfortably in hand or x on a tripod and point

the microphone at the suspected noise source, the sound pressure

level will be displayed.

4. When MAX (maximum hold) mode is chosen. The instrument captures

and holds the maximum noise level for a long period using any of the

time weightings and ranges.

5. When HOLD (data hold )mode is chosen.The hold function freezes the

reading in the display. Press the HOLD button momentarily to activate

or to exit the HOLD function.

6. Turn OFF the instrument and remove and remove battery when not in

use.

Calibration Procedures

Using a standard Acoustic Calibrator (94dB, 1kHz Sine wave)

1. Make the following function switch settings.

Display: dB, A, Hi or Lo, F

Function: A-Weighting

Response Time: Fast

Level Range: 30 to 100dB (Lo) or 60 to 130dB (Hi)

Measurement Mode: MAX Hold and DATA Hold mode function disable.

2. Insert the microphone housing carefully into the insertion hole of the

calibrator.

3. Open battery cover and remove the battery to adjust the CAL94dB

potentiometer of the unit. The level display will indicate the desired

level.

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Battery Replacement

1. Battery Loading: Open the battery cover and install a 9-Volt battery

in the battery compartment.

2. Battery Replacement: When the battery voltage drops below the

operating voltage, “BAT” appears in the display and the existing

battery should be replaced with a new one.

For service on this or any other REED product or information on other

REED products, contact REED Instruments at info@reedinstruments.com.

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Notes _________________________________________

________________________________________________

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