Unit UT353 User manual

PIN: 110401107881 X
UT353
Mini Sound Meters
Operating Instruction
1.1ntroduction
UT353 is a stable, safe, reliable mini sound meter, widely
used
in noise detection, quality control, health control,
environmental noise measurement in factory, traffic, home
audio and other places.
This operating manual includes relevant safety information
and warnings. Please read this manual carefully and
observe all cautions.
.&. Warning:
Before using the product, please read the operation rules
carefully.
2.0ut of the Box
Open the packing box and take out the meter.
Please check carefylly if any items are missing or
damaged.
1Wind-proof ball---------------1
2. Operating manual-----------1
3.0peration Safety
This product strictly follows the requirements of "General
specification for sound level meters" in design and
production.
1.Please check the meter and the accessories before
using and beware of any damage or abnormal
phenomenon. If you find the case is damaged or the
LCD shows nothing, or you consider that the meter could
not work properly anymore, please stop using it.
2.0bserve the operating instructions while measuring.
3.00 not open the meter at will or change internal wiring
to avoid damages to the mater.
4When the LCD displays "COil", replace the battery timely.
Remove the battery if the meter is not used for a long
time.
5.00 not store or use the meter in high temperature, high
humidity, flammable. combustible or strong electromagnetic
environment.
6.Please use soft cloth and neutral detergent to clean the
case for maintenance. Do not use grinding agent and
solvent
to avoid case corrosion and damage to the meter.
4.Product Outlook
1 Wind-proof ball I 2 I Microphone
3 Meter case I 4 I LCD display
5 Function keys
UNI-T.
Wind
(}1
~i)
Figure 1
5. Display Interface
CD
®
HOLD
111111'1
®
J.O.O.O::
®
®
®
FAST SLOW
(j)
Figure 2
1 Maximum measurement 5 A weighted
2 Minimum measurement 6 C weighted
3 Data hold 7 Slow response rate
4 Low battery 8 Fast response rate
9 Measurement value
6. Key Function and Setup
1. ON/OFF:
Short press once to start up; short press again to power
off.
Note: Product's auto power off feature can
be disabled:
Press and hold "HOLD" and then piess "ON/OFF" key to
enable/disable auto power off, LCD will display "APO OFF'
to indicate status.
2. FAST/SLOW:
Sampling time: When measuring, pressing this key
to
select between fast time of 125ms and slow time of 1 s.
3. MAX/MIN:
Pressing this key to select maximum, minimum and
normal value measurement; when maximum or minimum
measurement
is selected, the meter always shows the
maximum reading or the minimum reading.
4. HOLD/BL:
HOLD: Short press this key once to hold the
measurement: short press the key once again to exit
data hold and continue normal measurement.
BL: long press this key to turn on backlight, and long
press it again to turn off backlight.

7. Technical Specifications
1. Noise (dB)
Function Range Resolution Accuracy Description
Sound Level
30~130dB 0.1 dB
±1.5 dB Rate response: 31.5Hz-BKHz
Sampling Time
FAST 125ms
SLOW 1000ms
Overload Indication Shows
"UN" and "OL"
MAXIMIN Measurement Shows "MAXIMIN"
Data Holdl Backlight Shows "HOLD" and turns backlight on or off
Auto Power Off Automatically power off after 5mins without operation.
Low Battery Indication
3,0~3.5V
Shows low battery prompt when power is 3.0-3.5V
2. General Type:
a. LCD display: 4-bit LCD display. The maximum display
is 9999.
b. Overload indication: The meter shows "UN" when
under range, and shows "OL" when
over range.
c. Low battery indication: prompt "a", The new battery
should
be replaced in time.
d, Sampling rate: fast rate 1/125ms, slow rate 111 s
e. Sensor type: 1/2 inch condenser microphone
f. Impact strength: Can withstand the impact of landing
from 1 meter height
g. Power requirement: 1.5V batteries (MA) x3
h. Product size: 150mmx52mmx27mm
I. Weight: 116g
3. Environment Specification
a. Indoor use
b. Altitude height: 2000m
c. Safety: EN61326-1
d. Pollution level: 2
e. Working temperature and humidity:
Oo( -30
0( (not greater than 80%RH)
300 (-400( (not greater than BO%RH)
40"(-50"( (not greater than 45%RH)
f: Storage temperature and humidity:
_200(_600( (not greater than BO%RH)
4. Electrical Specifications
a. Accuracy: ±1.5dB (@1kHz Standard audio source).
Calibration period is 1 year.
b. Environment temperature: 23°( ± 5°(
c. Environment humidity: :So:BO%RH
d. Temperature coefficient: 0.1 x (Accuracy)/'(
5. General Maintenance
Warning: please do not open the meter case to avoid
affecting device accuracy or damage to the meter.
a. Maintenance and service of the meter should be
accomplished by professional personnel or designated
maintenance department.
b. Clean the case by dry cloth periodically. Detergent
with abrasive or solvent composition
shall not be used.
6. Battery Installation and Replacement
a, This device uses 3 pieces of AAA 1.5V batteries.
Please see figure below for steps of battery installation
and replacement.
b, Turn the panel down, push the battery cover open
in the direction of the arrow, lift the cover and remove
the batteries; install new batteries in accordance of
polarity indications.
c. Please use batteries of same type instead of improper
ones.
d. Close the cover tightly after installing new batteries.
Figure 3
UNI-"T:
UNI-TFIENO TECHNOLOGY, CHINA> CO., LTO.
No6. Gong Ye Bei 1st Road,
Songshan Lake National High-Tech Industrial
Development Zone, Dongguan City,
Guangdong Province, China
Tel: [phone]
http://wvlW.uni-trend.com