Prokit's Industries MT-4018 User Manual

SOUND LEVEL METER

Users Manual

■. Introduction

Please read the following information carefully

before using the meter. The Sound Level Meter has

been designed to measure sound level for various

environments. It is used to detect noise, music level

or sound engineering...

1.1 Precautions safety measures

Please use it according to the following usage.

Environment conditions:

● Altitude: less than 2000 meters.

● Relatively humidity 80% max

● Operation temperature 0~40℃

Maintenance & save:

Do not clear the meter using alcohol and impregnant.

if you do not use it for a long time, please take out the

battery and place the instrument in a dry surrounding.

Safety symbols:

Meter is protected by double insulation

Comply with European Union’s 93/68/EEC

1.1.1 During use

1. Do not use

wet place.

2. When you do not use for a long time, please take

out batteries

electrolyte.

3. Auto-range measuring (30-120dB) is unfit for

measuring instantaneous and impactive noise.

4. To measure sound level in a windy environment,

please put windscreen

avoid noise from wind.

5. If battery symbol is on the screen, it indicates

voltage is low and must replac

you to use alkaline battery.

6. Do not measure when meter is vibrant.

7. After power of

two seconds.

the meter in a high temperature or

to avoid damaging the meter by

on the microphone to

e battery. Suggest

f, to turn power on again, wait for

1.2 Functions & Features

● automatic ranging / manual ranging selection.

● Analog bar indicator.

● Frequency weig

● Range display.

● A utdown / continuous working mode

utomatic sh

selection.

● Low battery voltage indication.

● Sound OVER or UNDER display.

● Software calibrating to insure high reliab

Good circuit designed to save power.

●

hting A Type.

ility.

■. Features

● Th cording to the IEC651

e meter has been designed ac

Type 2, ANSI S1.4 Type 2.

● Response frequency: 31.5Hz—8kHz.

● Accuracy：30~60dB ±

● Resolution: 0.1 dB.

● M 60dB, 50—80dB,

easurement range：30—

70—100dB, 90—120dB.

3 dB; 60~120dB ±2 dB.

● Digital display：4 digitals.

● Frequency weighting： A Type.

● Response time：Analog bar 125ms Digital 750ms.

● Microphone： Electret Condenser

● Power supply: DC1.5V(AAA)*3 .

● Operating temperature ：0 ~ +40℃.

● Operating humidity： 10 ~ 80%RH.

● Storage temperature： -10 ~ +60℃.

● Storage humidity ： 10 to 70%RH.

● Dimensions： 156(L)×60(W)×32(H) mm.

● Weight ： Appr

● A

ccessories：

DC1.5V (AAA)

String x 1pcs

Plastic box x 1pcs

Users manual x 1pcs

Windscreen x 1pcs

ox 150 g (including battery).

x 3pcs

microphone.

■. Names of parts



Instrument Familiarization

1. Windscreen

2. Sound level sensor

3. LCD display

4. Function key

 LCD Display

ON
OFF

Sound level meter

Auto

Manu

The meaning of the symbols represented by the

following：

1. Analog bar

2. UNDER indication to high range

3. OVER indication to low range

4. Display zone

5. Auto mode

6. Manual mode

7. Sound unit: dB

8. Indication to low voltage of the batteries

■. Operation instruction

1. Press button On/Off , the meter starts auto-range

measuring after the screen displays all the LCD

segments. symbol AUTO displays and the micro-

controller selects a proper range to measure sound

automatically. The range is displayed on top of the

screen. Analog bar and digits indicate the value of

Sound to be measured. If symbol UNDER or

OVER appears, it means that environmental sound

is less than 30 dB or is higher than 120 dB.

2. To set range manually

If it is necessary to set range manually, press
button Auto/Manu, symbol MANUAL displays. You
can press button Up or Down to choose the proper

range. The range is displayed on top of the screen.

When LCD appears UNDER symbol, it indicates
that the range is high, you need to press button
Down to set lower range until no UNDER symbol.

When LCD appears OVER symbol, it indicates that
the range is low, you need to press button Up to

set higher range until no OVER symbol. If you want

to enter auto-range measurement, press button
Auto/Manu again.

3. To set power off
When meter is working, pressing button On/Off will

get shutdown immediately.

4. Automatic shutdown

When meter is working and stop to press button for

two minutes, shutdown will occurs automatically.

5. Continuous working mode

When you need to measure sound continuously,

should cancel automatic shutdown function. To get
that, before meter starts working, press button
Down and button ON/OFF at the same time,

automatic shutdown will not occur.

6. Low voltage indication

When battery voltage is too low to work, a battery

symbol appears on screen. It reminds you to

change battery.

■. Keys instruction

1. ON/OFF key

Press the key to turn the power ON. When meter is

working and stop to press button for two minutes,

shutdown will occurs automatically.

2. AUTO/M ANU key
Press AUTO/MANU key to shift auto or manual

measurement mode.

Under the state of auto-range measuring,

symbol AUTO displays and the micro- controller

selects a proper range to measure sound

automatically. The range is displayed on top of the

screen.

Under the state of manual-range measuring,

symbol MANUAL displays. You can press button Up
or Down to choose the proper range. The range is

displayed on top of the screen.

3. UP key

Under the state of manual-range measuring, You

can press button Up or Down to choose the proper

range.

When LCD appears OVER symbol, it indicates

that the range is low, you need to press button Up to

set higher range until no OVER symbol.

4. DOWN key

Under the state of manual-range measuring, You

can press button Up or Down to choose the proper

range.

When LCD appears UNDER symbol, it indicates

that the range is high, you need to press button
Down to set lower range until no UNDER symbol.

Press button Down and button ON/OFF at the

same time, automatic shutdown will not occur.

■. Calibrating Sound level Meter

When Sound Level Meter is used for a long time,

the accuracy may reduce, you need to check and

calibrate it, normally a time for each year.

Calibration needs a standard sound source, please

contact with us about the method.

■. Maintenance

1. CLEANING INSTRUCTIONS

The meter may be wiped down with a wet sponge or

cloth using a mild water based detergent or

anti-bacterial soap and rinsed under a gentle stream

of cold water.

NOTE:

This unit is not designed for complete submersion or

washing in water.

2. BATTERY REPLACEMENT

Use the following procedure:

When the battery voltage drop below proper operation

range the symbol will appear on the LCD display

and the battery need to be replaced.

* Press the battery cover and towards arrowhead

direction to open the battery cover.

* Replace the battery with three new 1.5V batteries

(AAA).

* Replace the battery cover.

WLS2114