9
10
8
11
13
12
Button
Operation Performed
LEVEL Press to selection of Auto ranging, Manual
ranging.
The Meter is default to auto ranging.
Press LEVEL button to switch to manual
ranging. Press
button to toggle from
low to high range or from high to low
range. Press and hold LEVEL button to
exit the manual ranging mode.
FAST/
SLOW
Press to select a FAST (125ms) or a
LOW (1 second) response time. Select
FAST to capture noise peaks and noises
that occur very quickly. Select the LOW
response to monitor a sound source that
has a consistent noise level or to aver
age quickly changing levels. Select LOW
response for most application.
Press and hold FAST/SLOW button to
enable display backlight. Press and hold
FAST/SLOW button again to disable
display backlight.
For UT352, press FAST/SLOW button to
store data:
Press HOLD button to freeze data, the
LCD displays HOLD and M symbol and
the data being stored.
Press FAST/SLOW to store the data,
the symbol RECORD and the number
of index blink for 0.5 seconds.
The Meter will automatically exit HOLD
mode.
The Meter can store up to 63 data.
MAX/
MIN
Press MAX/MIN to display the maxi
mum or minimum reading. The display
will update only when the measured value
exceeds the value presently in the display.
Press the MAX/MIN button and the MAX
icon will display on the reading. The reading
displayed is the highest reading encountered
since the MAX mode was entered.
Press and hold MAX/MIN button to
disable or enable auto power off feature.
The Meter will automatically off after
approximately 15 minutes of inactivity.
The icon display indicates that the
auto power off feature is active.
Button
Operation Performed
Calibration
(see figure 4)
1. Turn the Meter on.
2. Put the Meter in the “A” weighting mode, FAST
response mode, range set to 60~110dB, lock to MAX.
3. Place the microphone onto the calibrator’s 1/2 inches
sound source hole.
4. Turn the calibrator on, using 94dB@1kHz standard
sound source.
5. Adjust the Meter’s CAL potentiometer located on the
side panel until the LCD displays 94.0dB
figure 4
Specifications
A.General Specifications
Display: 3 1/2 digits, 1999 maximum
Overloading:
Under range displays
UNDER
Over range displays
OVER
Battery Deficiency:
Change batteries as soon as
is displayed.
Sampling Rate:
Fast Speed: 125 microseconds
Slow Speed: 1 second
Microphone: 1/2” electret condenser
Drop Test: 1 meter pass
Battery: 4 x 1.5V batteries (AA)
Battery Life: Typical 20 hours continuous
Dimension: 273 x 69 x 39mm
Weight: around 386 g (including batteries)
B.Environmental Requirements
For indoor use only.
Altitude: 2000m
Temperature and humidity:
Operating:
0 ~30 (≤80%R.H)
30 ~40 (≤75%R.H)
40 ~50 (≤45%R.H)
Storage:
-20 ~ +60 (≤80%R.H)
Safety/ Compliances:
EN61326:1997+A1:1998+A2:2001+A3:2003,
EN61672-1: 2002 Class 2 and IEC60641:1979 Type 2,
ANSI S1.4:1983 Type 2
Certification:
Accuracy Specifications
Accuracy:±(a% r b digits).guarantee for 1 year.
Operating temperature:23 ±5 .
Relative humidity:≤80%.
Temperature coefficient: 0.1 x (specified accuracy) / 1
A. Decibel dB
Maintenance
This section provides basic maintenance information
including battery replacement instruction.
Warning
Do not attempt to repair or service your Meter unless
you are qualified to do so and have the relevant
calibration, performance test, and service information.
To avoid electrical shock or damage to the Meter, do
not get water inside the case.
In order not to affect the Meter accuracy or damge to
the Meter, do not open the Meter housing
A.General Service
Periodically wipe the case with damp cloth and mild de
tergent. Do not use chemical solvent.
To clean the terminals with cotton-tipped swab with de
tergent, as dirt or moisture in the terminals can affect
readings.
Press the Meter power off when it is not in use and take
out the battery when not using for a long time.
Do not store the Meter in place of humidity, high tem
perature, explosive, inflammable and strong magnetic
field
B.Replacing the Battery
(see figure 5)
figure 5
Warning
To avoid false readings replace the battery as
soon as the battery indicator
appears.
To replace battery:
1.Press the Meter power off
2.Remove the screw from the battery compartment, and
then take out the battery door from the battery compart
ment.
3.Remove the battery from the battery compartment.
4.Replace the battery with 4pcs new 1.5V AA batteries
5.Rejoin the battery door and the battery compartment,
and install the screw
Copyright 2008 Uni-Trend Group Limited.
All rights reserved.
Manufacturer:
Uni-Trend Technology (Dongguan) Limited
Dong Fang Da Dao
Bei Shan Dong Fang Industrial Development District
Hu Men Town, Dongguan City
Guang Dong Province
China
Postal Code: 523 925
Headquarters:
Uni-Trend Group Limited
Rm901, 9/F, Nanyang Plaza
57 Hung To Road
Kwun Tong
Kowloon, Hong Kong
Tel: (852) 2950 9168
Fax: (852) 2950 9303
Email: [email protected]
http://www.uni-trend.com
14
MAX/
MIN
Function Range Resolution Accuracy
Remarks
Sampling Time: 125 microsecond
Sampling Time: 1 second
1 dB per scale,
Sampling time: 200 times per second
Over range display: OVER
Under range display: UNDER
Has input terminal
Has input terminal
Turn on and off the Meter and data
holding
Selecting auto and manual ranging
RECALL/CLR features are for model
UT352 only. Press to recall and clear
data
STORE feature is for model UT352
only. Press to store data
30~80dB
50~100dB
60~110dB
80~130dB
FAST
SLOW
30~130dB
Output impedance around
100Ω, 10mV/dB
Output impedance around
600Ω, 0.707V/ each scale
A-Weighting and
C-Weighting selection
Selection of fast or slow
sampling rate and turn on
and off of display backlight
Selection of maximum and
minimum value.
Selection of auto power on
and off
A-Weighting and
C-Weighting
Sampling Rate
Analogue Bar Graph
Overloading
DC analogue signal
output
AC analogue signal
output
Power (HOLD)
LEVEL (AUTO)
A/C (RECALL/CLR)
FAST/SLOW
(STORE/BL)
MAX/MIN (Auto
ranging)
0.1dB
±1.5dB
1dB
Frequency Response
31.5~8kHz
Press MAX/MIN button again. The MIN
icon will appear on the display. The read
ing displayed is the lowest reading
encountered since the MIN mode was
entered.
Press the MAX/MIN button again to exit
the MAX/MIN display mode
