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Digital
Digital
Digital
Digital Sound
Sound
Sound
Sound Level
Level
Level
Level Meter
Meter
Meter
Meter
Operation
Operation
Operation
Operation Manual
Manual
Manual
Manual
Ⅰ
. Preface
Thank you for selecting our production. 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 noice, music level or sound engineerings...
Ⅱ
. Safety information
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
Ⅲ
. Functions & Features
The meter has been designed according to the IEC651 Type 2, ANSI S1.4 Type 2.
Measurement range is from 30dB to 130dB and automatic ranging.
With two equivalent weighted sound pressure levels,Aand C.
Corresponsive rate select: FAST/SLOW
Maximum value locked.
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Clock and calendar function.
AC and DC analog signals output, which can be linked to frequency analyzer or X-Y axis recorder.
Background light for working in the night. to save power, the background light shines for 5 seconds,
then closes automatically.
Secondary plasticizing meter shell.
Good circuit designed to save power, the battery can be used for a long time.
Ⅳ
. Specifications
Accuracy
：
± 1.5dB
Response frequency: 31.5Hz — 8kHz
Dynamic range: 50dB
Frequency weighting: A\C
Time weighting
：
FAST 125ms, SLOW 1sec
Microphone
：
Electret Condenser microphone
Digital display
：
4 digitals, resolution 0.1dB,sampling rate 2 times/s
Analog bar display
：
Each analog bar is as 1dB,
sampling rate 20 times/s
Measurement ranges：30 — 80dB, 40 — 90dB,50 — 100dB,
60 — 110dB, 70 — 120dB,80 — 130dB.
Total of 6 ranges
Auto-range
：
Micro-computer can choose the best
measurement ranges
Over range indicator
：
UNDER(less than range) and OVER
(over range )
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AC signal output
：
0.707 Vrms at FS (Auto-range mode
isn ’ t included) Output impedance approx. 600 Ω
DC signal output
：
10mV/dB Output impedance approx.100 Ω
Power supply
：
Four LR03 AM4 1.5V SIZE AAA alkaline cells
Power life
：
About
﹥
35hrs(alkaline cells)
Continuous operation
AC adapter
：
Voltage
9vDC
Voltage
ripple <100mVpp
Supply Current >100mADC
Socket pin Ground
Casing positive
External Diameter 3.5mm
Operating temperature
：
0 ~ +40
℃
Operating humidity
：
10 ~ 80%RH
Storage temperature
：
-10 ~ +60
℃
Storage humidtiy
：
10 to 70%RH
Dimensions
：
245(L) × 80(W) × 35(H)mm
Weight
：
Approx.350g(including battery)
Accessories
：
Earphone plug, Operation manual, Battery,
Windscreen.
Ⅴ
. Preparation before using
Remove the battery cover on the back and put in six 1.5V 7
＃
alkalescent battery.
Close the battery cover.
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When the battery voltage drops below the operating
voltage, mark “ ” appears and flashes. It must bedone to replace all batteries with new one.
When the DC adapter is used, insert the plug of the adapter into the DC 9V connector on the side
panel.
Ⅵ
. The method of usage
1. Press the power switch, LCD displays the default
range(40~90dB). and displays the sound level of a spot. If the display appears “ UNDER ” or “ OVER ”
symbol, it indicates the sound level less than or more than 40~90dB, measurement is invalid. you need
to set the meter’s range to a correct position.
2. Set range:
Press LEVEL ▲ or ▼ , choosethe proper range,
measure the sound level of the spot. When LCD appears “ UNDER ” symbol, it indicates that the range
is high, you need to press LEVEL ▼ to set lower range until no “ UNDER ” symbol. When LCD
appears “ OVER ” symbol, it indicates that the range is low, you need to press LEVEL ▲ to set higher
range until no “ OVER ” symbol.
3. Choose weighting mode:
when you measure a general noise sound level, you could choose ‘A’
weighting bypressing A ⁄ C
button.
To
measure a acoustic sound level , choose “ C ” .
4. When you want to get a real-time sound level, choose FAST by pressing FAST ⁄ SLOW button.
To
get average sound level, choose “ SLOW ” .
5. When you want to get the maximum value of a sound level, you can press “ MAX ” button.
6. When you want to measure in the night, you can open the background light by pressing “ LIGHT ”
button.
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Ⅶ
. Set time and date
Press “ MAX ” button then turn on the meter, LCD display time(hour, minute, second), the second
digitals are flashing, press LEVEL ▲ or LEVEL ▼ to increase or decrease time; press “ MAX ” to set
minute, hour, mouth, year. after setting is completed, turn off
the meter.
Ⅷ
. Calibrating Sound level Meter
When Sound Level Meter is used for a long time, it’s accuracy may reduce, we 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.
Ⅸ
. Cautious
Do not use the meter in a high temperature or wet place.
When you do not use for a long time, please take out battery to avoid damaging the meter by
electrolyte.
Auto-range (30-130dB) is unfit for measuring a instantaneous and impactive noises.
To
measure sound level in a windy environment, please put windscreen on the microphone to avoid
noises from wind.
If mark “ ” is on the screen, it indicates the
voltage is low, you must replace battery, we advise you to use alkalescent battery.
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