Center 323 User manual

323
Data Logger
SOUND LEVEL METER
SE-323

CONTENTS
Title Page
1. SAFETY INFORMATION………..………..………………..1
2. GENERAL DESCRIPTION ……………………..……...….1
3. FEATURE ………………………………………………......1
4. SPECIFICATIONS ..…………………..…………………....2
5. NAME AND FUNCTIONS ..………….……………............3
Display screen……………………………………………….4
6. DATA LOGGER & INTERVAL SETUP……………….…..7
6.1 Auto store …………………………………………….....7
6.2 Clearing Stored Data …………………….…………….8
7. SETTING THE DATE AND TIME………………………… 8
8. CALIBRATION PROCEDURES….………………………..9
9. MEASUREMENT PREPARATION………….………........9
10. OPERATING PRECAUTIONS………………………….10
11. MEASUREMENT………….……………………………..11
12. SETUP SE-323………………………………..…...........11

Sound Level Meter
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1. SAFETY INFORMATION
Read the following safety information carefully before attempting to operate or
service the meter.
Use the meter only as specified in this manual; otherwise, the protection
provided by the meter may be impaired.
Environment conditions
Altitude up to 2000 meters
Relatively humidity 90% max.
Operation Ambient 0 ~ 40C
Maintenance & Clearing
Repairs or servicing not covered in this manual should only be performed by
qualified personnel.
Periodically wipe the case with a dry cloth. Do not use abrasives or solvents
on this instrument.
Safety symbols
Comply with EMC
When servicing, use only specified replacement parts.
2. GENERAL DESCRIPTION
Thank you for using our Data Logger Sound Level Meter. To ensure that you
can get the most from it, we recommend that you read and follow the manual
carefully before use.
Measurement settings and results (level values and bar graph) are shown on
the backlit LCD panel.
Data can be stored in the meter or directly saved on a computer through USB
interface. Recorded data can be further processed on a computer.
3. FEATURE
Complies with IEC 61672-1 class 2 standard
64,000 Records Data Logger
USB Interface
With Windows software
AC/DC signal output

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4. SPECIFICATIONS
Standard applied: IEC61672-1 Class 2,ANSI S1.4 Type2.
Frequency range: 20Hz ~ 8KHz
Measuring level range: 30 ~ 130dB
Frequency weighting: A / C
Microphone: 1/2 inch electret condenser microphone
Display: Liquid Crystal Display
Digital display: 4 digits
Resolution: 0.1dB
Display Update: 0.5 sec.
Analog display: 30 segment bargraph
Resolution: 2dB
Display Update: 50 mS
Time weighting: FAST , SLOW
Level ranges: Lo : 30 – 90 dB
Med : 50 – 110 dB
Hi : 70 – 130 dB
Auto : 30 – 130 dB
Accuracy: ±1.4dB ( under reference conditions @ 94dB, 1KHz )
Dynamic range: 60 dB
Alarm function: “OVER” is when input is more than upper limit of range.
“ UNDER ” is when input is Less than lower limit of range.
Data logging Capacity: 64,000 records
AC output: 1 Vrms at FS ( full scale )
(FS︰means the upper limit of each level range.)
DC output: 10mV / dB
Power supply: 4AAA,NEDA 24A, IEC LR03 batteries
Power life: About 24hrs ( alkaline battery )
Power consumption: Approx. 0.2W
External power supply: 5 VDC ( micro USB plug)
Operation temperature: 0 to 40C ( 32 to 104F )
Operation humidity: 10 to 90%RH
Storage temperature: -10 to 60C ( 14 to 140F )
Storage humidity: 10 to 75%RH
Dimensions: 264(L)×63(W)×29(H)mm; 10.4(L)×2.5(W)×1.1(H)inch

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Weight: 245g ( including battery )
Accessories: 1.5V battery X 4pcs, carrying case, Instruction manual,
Windscreen, 3.5plug, software, USB Cable.
Option: Microphone Extension Cables (5m or 10m length).
5. NAME AND FUNCTIONS

Sound Level Meter
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Display Screen:
SYMBOL FUNCTION
Battery capacity indicator
Auto power off indicator
Maximum/Minimum indicator
Time weighting indicator
Level range indicator
Bar graph
Time
Frequency weighting indicator
Level reading
Date
Over-range signal indicator
Memory full
Recording datalogger indicator
Under-range signal indicator

Sound Level Meter
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○
1Windscreen:
When making outdoor measurements in windy weather or when measuring
air conditioning equipment or similar, wind noise at the microphone can
cause measurement errors. Such effects can be reduced by using the
windscreen.
○
2Display screen.
○
3Power button:
Press the button to turn the meter on. To turn the unit off, press and
hold button down until the screen shows “ OFF 3, 2, 1,” then the LCD
screen goes off.
LCD backlight on/off:
Press to turn on the LCD backlight. This makes it easier to read in
dark environment. Press again to turn off backlight. The meter can
also turn the backlight off automatically after 30 seconds to save battery
power.
Auto power off.
To save battery life, by default, when the unit is powered on, it is under auto
power off mode.
The unit will power itself off after 30 minutes if no key operation.
Auto power off will be disable under the following 2 circumstances.
(1) When connecting to PC.
(2) When recording function is on process.
Disabled auto power off.
One may press and hold button and then power on the meter and the
will not show up to indicate that auto power off is disable.
Note: When the user powers it on, the LCD will show how much internal
memory space is available to use.
○
4MAX/MIN button:
Press button to enter the maximum and minimum recording mode.
Under this mode, the maximum value and minimum value will be stored
and automatically updated in the memory simultaneously.
Pressing the button will display the “ ” symbol and the
Maximum value on the display. Pressing button again will display the

Sound Level Meter
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DC Signal
AC Signal Ground
“ ” symbol indicator and the Minimum value on the display.
Pressing button again will cause the maximum and minimum
indicators to blink together. Which means the meter is under maximum and
minimum recording mode. The value displays on the screen is the present
value.
To exit the maximum and minimum mode, press and hold button
down until the “ ” symbol is disappears.
○
5REC button:
When press the button, the unit will start recording, and the “ ” symbol
display. To stop recording press again button.
○
6A/C button:
Sets frequency weighting to A or C.
○
7FAST/SLOW button:
Sets the time weighting to Fast or Slow.
○
8Range control button
Each time you press button, the level range will change between
“Lo” level, “Med” level, “Hi” level and “Auto” level in the circular.
○
9Microphone:
1/2 inch Electret Condenser microphone.
○
10 AC/DC signal output jack:
AC︰1 Vrms Corresponding to each
range step. (with frequency weighting)
Output impedance ≒100Ω
Output signal by standard 3.5mm
coaxial socket signal on pin.
Note: At “Auto” level range, output signal is Auto select on “Lo” or “Med” or
“Hi” level range.
DC: Output: 10mV/dB
○
11 USB Interface
Connection to a Computer or external power supply intput.

Sound Level Meter
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○
12 Tripod mounting thread:
For long-term measurements, the unit can be mounted on a camera tripod.
Proceed carefully, to avoid dropping the unit.
○
13 Battery compartment.
6. DATA LOGGER & INTERVAL SETUP
How to store data in memory.
Auto store Interval time setup:
(1) Press and hold “ ” button and then power on the
meter.
(2) Press INTV() button, “ Int ” appears for interval, as
well as a flashing second display.
(3) Now set the desired recording interval in minutes and
seconds. Press ▲() or ▼( ) to increase or
decrease number, Max 1 minute can be set. The minimum
value is limited to “00:01”(=1s). After setting has been
performed, actuate the press INTV() button once, to get
back to the display of the instantaneously measured values.
If you want abort during a setup process, press button
to cancel.
6.1 Auto store:
Auto store Interval time setup:
When one presses the button starts saving the measured values .The
values are stored in a memory location. Press button again will stop
recording.
Note: During recording period, most of the buttons such as the , ,
are inoperative. All other settings must be made before starting the
record operation.
LCD will show FULL symbol when 64,000 recorders are stored in memory.

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6.2 Clearing Stored Data :
If you want to clear the memory, power off the unit,
then press and hold button and then press
button and hold at least 5 seconds, then LCD
will show "CLr" and “SURE” to clear the memory.
Note:
The battery indicator “ ” shows the remaining
battery power. The number of black bar decreases as
the battery running out. When the power is almost
empty, “” will disappear. Press button,
LCD display will show “ Lo bat ” warning indication. If
the meter is under record mode, it will stop.
7. SETTING THE DATE AND TIME
The unit incorporates a clock so that the data logger function
can also record the data and time along with the measurement
value in the memory.
(1) Turn off the unit.
(2) Enter SETUP mode by pressing and holding button
and then press power button to turn on the unit.
“SEt ” blinks on the LCD screen.
(3) Press CLOCK() button to set clock.
(4) Press ▲() or ▼( ) to adjust year, press
CLOCK() button to adjust next value (month
datehourminutesecond).
(5) When finish, press CLOCK() button to exit SETUP
mode.
Note:
(1) To abort during the process, press power button to exit SETUP mode.
(2) An internal rechargeable backup battery keeps the clock of the unit running