Model UT351/UT352: OPERATING MANUAL
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Table of Contents
Title Page
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
A. Meter Front
B. Side Panel
Display Symbols
Measurement Operation and Functional Buttons
Calibration
Specifications
A. General Specifications
B. Environmental Requirements
Accuracy Specifications
A. Decibel dB
Maintenance
A. General Service
B. Replacing the Battery
Overview
Sound Level Meter Model UT351 and UT352 (hereafter referred to as “the Meter”) is a stable, safe and reliable sound level meter. The Meter is suitable to use in noise control,
quality control, health care and all different kind of environmental noise testing. For example: factory, road, family, musical instrument and all kind of places which need noise
testing.
Unpacking Inspection
Open the package case and take out the Meter. Check the following items carefully to see any missing or damaged part:
Item Description Qt
1 English Operating Manual 1 piece
2 Windscreen 1 piece
3 1.5V Batteries (AA) 4 pieces
In the event you find any missing or damage, please contact your dealer immediately.
Safety Information
This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage category (CAT. I 1000V, CAT. II 600V) and double insulation.
CAT. I: Signal level, special equipment or parts of equipment, telecommunication, electronic, etc., with smaller transient overvoltages than overvoltages CAT. II.
CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient voltage overvoltages than CAT. III
Use the Meter only as specified in this operating manual, otherwise the protection provided by the Meter may be impaired.
In this manual, a Warning identifies conditions and actions that pose hazards to the user, or may damage the Meter or the equipment under test.
A Note identifies the information that user should pay attention on.
International electrical symbols used on the Meter and in this Operating Manual are explained on page XXX.
Rules For Safe Operation
Before using the Meter inspect the case and accessories. Do not use the Meter if it is damaged, LCD cannot display, the case (or part of the case) is removed or
you consider the Meter does not work properly. Look for cracks or missing plastic.
When using the Meter, must follow the instruction manual.
The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident.
Replace the battery as soon as the battery indicator appears. When the battery voltage is between 4.5V to 4.8V, low battery symbol display.
When the battery voltage is between 4.5V to 4.3V, low battery symbol blink. The Meter will be automatically power off after 1 minute.
Turn the Meter power off when it is not in use and take out the battery when not using for a long time.
Do not use or store the Meter in an environment of high temperature, humidity, explosive, inflammable and strong magnetic field. The performance of the Meter
may deteriorate after dampened.
Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing. No abrasive and solvent should be used to prevent the surface of
the Meter from corrosion, damage and accident.
Constantly check the battery as it may leak when it has been using for some time, replace the battery as soon as leaking appears. A leaking battery will damage
the Meter.
International Electrical Symbols
Conforms to Standards of European Union
The Meter Structure
(see figure 1)
A. Meter Front
1. Housing
2. Windscreen
3. Microphone
4. LCD Display
5. Functional Buttons
6. Signal output and power terminals
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Model UT351/UT352: OPERATING MANUAL
B. Side Panel (see figure 2)
1. DC Output Terminal: DC analogue signal output. Output impedance is around 100Ω (10mV/dB)
2. AC Output Terminal: AC analogue signal output. Output impedance is around 600Ω (0.707mV/ each range scale)
3. CAL potentiometer: Calibration
4. External DC6V: Using power adaptor DC6V, output plug (·3.5) to plug in the terminal. It can use 4pcs of 1.5V batteries or power adaptor to power up the Meter
Display Symbols (see figure 3)
No. Meaning
1 Data Store is full
2 Date and Time display
3 Data Store
4 Decibel
5 C-Weighting
6 A-Weighting
7 Sound value display
8 Range display
9 Over range
10 Slow response
11 Fast response
12 Low battery display
13 Data Hold is on
14 Auto power off enabled
15 Under range
16 Analogue bar graph display
17 Symbol of Sound Pressure Level
18 Auto ranging enabled
19 Date display
20 Time display
21 Maximum value display
22 Minimum value display
23 Data Store enabled
Measurement Operation and Functional Buttons
Below table indicated for information about the functional button operations
Button Operation Performed
HOLD
A/C
LEVEL
FAST/SLOW
Turn the Meter on and off. Press once to turn the Meter on.
Press and hold for around 1 second to turn the Meter off.
HOLD feature: During sound measurement, press once to
freeze the current reading in the display. Press the button again
to resume normal operation.
During sound measurement, press A/C button to select “A” or “C”
frequency weighting. With “A” weighting selected, the frequency
response of the Meter is similar to the response of the human ear.
“A” weighting is commonly used for environmental or hearing
conservation programs ‘C” Weighting is a much flatter response
and is suitable for the sound level analysis of machines, engines,
etc. Most noise measurements are performed using “A”
Weighting and SLOW Response.
For the Model UT352, press A/C button also could recall and clear
data:
RECALL:
Press and hold this button, the LCD displays the last
Press button to recall additional stored reading.
Press
CLR:
Press and hold A/C button when turning on the
Press to selection of Auto ranging, Manual ranging and auto power off
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.
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 average 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
data stored and the index number.
button to exit the RECALL mode
Meter until the LCD displays CLR and RECORD.
All the data stored will be cleared.
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