Mastech ms6708 User manual

Digital Sound Level Meter
Operating Manual

Contents
I. Preface…………………………………………………1
II. Safety instructions.........................................................1
III. LCD display introduction........................….....…........1
IV. Functional characteristics description.........…...…......2
V. Specifications ……………………………..…..…........2
VI. Preparations before use .............................…….......... 3
VII. Basic usage methods……………………..…..…..….4
VIII. Calibrate sound level meter………………..……….5
IX. Notes…………………………………..…..………….5

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I. Preface
Thank you for using our product.
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.
II. 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 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.
III. LCD display introduction

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Display
symbols
Description
Display
symbols
Description
FAST
High speed
OVER
Over flow
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
IV. Functional characteristics description
● This sound level meter complies with IEC651 Type 2 and
ANSI S1.4 Type 2.
● With 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
● Maximum (MAX) locking function

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●Digital display, good anti-interference performance, power
saving
● With 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-resisting, but also elegant.
● With 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, 35-130
dBC.
● Sound pressure frequency weighting characteristics: A and
C characteristics.
● Dynamic characteristic of sound pressure: FAST 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.

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● 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: 4 x 7th 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
● Weight: about 222 g (including batteries)
● Accessories: Headphone plug, operating manual, batteries,
cotton ball
VI. Preparations before use
1. Use cross screwdriver to open the battery cover on the
back of the meter, and install 4 7th alkaline batteries of 1.5V
each to the battery holder.
2. Return the battery cover and use cross screwdriver to
tighten screw.
3. When the battery is aging, “ ” symbol will appear on
the LCD display, indicating that batteries don’t have enough
power to use, and should be replaced with new ones.
VII. Basic usage methods
1. Press the power switch, the default measurement gear
level of LCD display microprocessor is 40~90 dB. And the
measured onsite sound level will display within this range. If
one of the “UNDER” or “OVER” characters displays on the
LCD, it means that onsite sound is either lower or higher
than the limit range of 40 ~ 90 dB. At this time, the

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measurement value is not accurate, you should click Up and
Down key to set the measurement gear level of the
instrument to get accurate measurement value.
2. Setting measurement gear level:
Press the Level▲ or ▼ keys to select appropriate gear level
to measure the current sound level, when the “UNDER”
character appears, it means that the gear level of the
instrument is too high. You should press Level▼ to set a
lower gear level until the “UNDER” character disappears.
When the “OVER” character appears, it means that the gear
level of the instrument is too low. You should press Level▲
to set a lower gear level until the “OVER” character
disappears.
3. Selecting the weighting mode:
To measure the sound level within the human audible range,
select A weighting mode (simulate the hearing
characteristics of human ears) mode, press the A/C key, click
to select A, click again C. To measure the actual sound level,
select C weighting mode.
4. To read real-time sound level, select FAST (high speed).
To obtain the average sound level, select SLOW (low speed).
Press FAST/SLOW key to select FAST or SLOW.
5. To obtain the maximum sound level, press “MAX”
function key and you can read the maximum sound level
reading value, press MAX key again to return to the normal
measurement mode.
6. To light up the backlight of LCD when measuring at night,
press key.
VIII. Calibrate sound level meter
If the sound level meter is used for too many days, the
measurement accuracy will reduce. At this time, the sound

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level meter should be calibrated. Usually it should be
calibrated once a year. Standard sound source is required for
calibration. Please contact our company for specific method.
IX. Notes
1. Do not use the meter in hot, humid environment.
2. If the meter is not to be used for a long time, remove the
batteries to avoid electrolyte leakage damaging the
instrument.
3. Auto gear level (30-130 dB) is not suitable for measuring
transient impact noise.
4. When you measure sound level outside, anti-wind ball
should be installed on the microphone head to avoid blowing
directly into the microphone and generating airflow noise.
5. If “”symbol displays on the LCD, it means that the
battery voltage is too low. You should immediately replace
batteries. It is recommended that you use alkaline batteries.

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