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t Equipment Depot - 800.517.8
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431
MT-4618
Sound Level Meter
User’s Manual
st
1
Edition, 2015
©2015 Prokit’s Industries Co., Ltd
Preface
Please read the operating manual carefully before using
the product.
The Sound Level Meter is an instrument used to
measure the ambient sound level, such as sound level
around factories, workshops, schools, residential, offices,
road, audio etc. It also can be appropriate for noise
engineering, product quality control, health prevention
and treatment, etc.
Safety instructions
Please use according to each specification of sound level
meter.
Operating environment:
● Elevation ＜2000 m
● Relative humidity (RH) ≦80%RH
● Operating temperature 0 - 40°C
Storage and maintenance:
Do not use alcohol or other
solvents to clean the meter. If it is not to be used for a
long time, remove batteries and keep the meter in a dry
and clean environment.
Safety symbols:
Dual protection is used for the meter.
Comply with CE safety standard.
1
LCD display introduction
Display
symbols
FAST High
Description Display
symbols
OVER Over flow
Description
speed
SLOW Low speed A A weighting mode
HOLD Keep C C weighting mode
UNDER Below dB Decibel
MAX Maximum SONE Sound unit (sone)
MIN Minimum Battery power
Functional characteristics description
● This sound level meter complies with IEC651 Type 2
and ANSI S1.4 Type 2.
●Includes the measuring scope from 30 to 130 dB and
automatic shifting function
● A and C weighting network selection
● High speed (FAST)/Low speed (SLOW) response rate
selection
2
● Maximum (MAX) locking function
● Digital display, good anti-interference performance,
power saving
●Includes the backlight feature, it is appropriate for
gathering the sound data at night. To save power,
backlight auto power off function is provided.
● Composite material injection molding process is
adopted for casing with anti-drop structure design. It is
not only extremely wear-resistant, but also elegant.
●Includes power saving and high-reliability circuit design,
well-designed high-efficiency power supply circuit makes
the batteries more durable.
V. Specifications
● Sound pressure accuracy: ± 1.5 dB (sound pressure
standard, 94 dB @ 1KHz).
● Sound pressure accuracy: ±5 dB (sound pressure
standard, 94 dB @ 8KHz).
● Sound pressure frequency response: 30Hz - 8KHz.
● Dynamic range of sound pressure: 50 dB (for each
measurement gear level).
● Sound pressure measurement scope: 30-130 dBA,
30-130 dBC.
● Sound pressure frequency weighting characteristics: A
and C characteristics.
● Dynamic characteristic of sound pressure: FAST
3
125ms, SLOW 1sec
● Microphone: polarized capacitive microphone.
● Digital display: 4-digit, resolution: 0.1 dB, sampling rate:
2 times/sec.
● Analog bar display: Each analog bar represents 1 dB,
sampling rate is 20 times/sec.
● Measurement gear level: 30-80 dB, 40-90 dB, 50-100
dB, 60—110 dB, 70—120 dB, 80-130 dB, 6 gear levels in
total.
● Automatic shifting gear level: microcomputer will
automatically select the best gear level in the range from
30 to 130 dB.
● Below or above limit prompt: indicated with “UNDER”
or “OVER” display.
● Power supply: AAA x 4 batteries of 1.5V each
● Operating temperature: 0 ~+ 40 °C
● Operating temperature: 10 ~80％RH
● Storage temperature: - 10 ~+ 60 °C
● Storage humidity: 10 ~70％ RH
● Outside measurement: 193 (L) × 60(W) × 29 (H) mm
● Accessories: Instruction manual, cotton ball
Preparations before use
1. Use a phillips head to open the battery cover on the
back of the meter, and install AAA x 4 alkaline batteries
4
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