Center 392 User manual

392
INTEGRATING
SOUND LEVEL METER
SE-392

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 Recording Data……………………………………........7
6.2 Recording Interval Setup…………………...………….7
6.3 Clearing Stored Data…………………………………...7
7. LEQ & INTEGRATING SETUP……………………………8
8. SETTING THE DATE AND TIME………………………… 8
9. CALIBRATION PROCEDURES….………………………..9
10. MEASUREMENT PREPARATION……..…….………..10
11. OPERATING PRECAUTIONS………………………….10
12. MEASUREMENT………….……………………………..11
13. SETUP TestLink SE-392……………………..…...........12

Integrating 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 & Cleaning
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 selecting our Integrating 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 the requirements of IEC 61672-1 class 2 standard
Fast, Slow time weighting settings
A and C frequency weighting settings
Storage of up to 64,000 records data logger
USB interface

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With Windows software
AC/DC signal output
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: 50 segment bargraph
Resolution: 2dB
Display Update: 50 mS
Time weighting: FAST (125mS), SLOW (1 sec.)
Accuracy: ±1.4dB ( under reference conditions @ 94dB, 1KHz )
Dynamic range: 100 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
MAX/MIN hold: Hold readings of the maximum and minimum value.
AC output:1VrmsatFS(fullscale).
DC output: 10mV / dB
Power supply: Four IEC LR6 (AA-size) batteries
Power life: About 60hrs ( 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: 272(L)×83(W)×42(H)mm; 10.7(L)×3.3(W)×1.6(H)inch

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Weight: 390g ( including battery )
Accessories: 1.5V battery X 4pcs, carrying case, instruction manual,
windscreen, 3.5plug, software, micro USB cable.
Option: Microphone extension cable (5m or 10m length).
5. NAME AND FUNCTIONS

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Display Screen:
SYMBOL FUNCTION
Battery capacity indicator
Auto power off indicator
Maximum/Minimum indicator
Fast/Slow time weighting indicator
Sound level range indicator
Bar graph
Time-weighted sound level reading sound
pressure level
Equivalent continuous sound level reading
Time and elapsed time indicator
(hour:minute:second)
Start/pause/stop integrating sound level
measurements
The integrating time
A or C frequency weighting indicator
Sound level reading (30.0-130.0dB)
Date and elapsed time indicator(year-month-day)
Over-range signal indicator
Recording memory bank full
Data recording is in process
Under-range signal indicator
The integrating time counting indicator

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○
1Power button:
Press the button to turn on. Press and hold the button for 3 seconds to
turn off.
Auto Power Off:
When the unit is powered on, it is under auto power off mode by default.
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:
Press and hold the button and then power on the unit. Keep holding
button until the meter starts function. Make sure the auto power off symbol
disappears from the display screen.
Note: When the user powers it on, the LCD will show how much internal
memory space is available to use.
○
2Integrating time button:
Press the button to set the integrating time.
○
3REC button:
Press the button to start recording, and the “ ”symbol will display.
Press button again to stop record.
○
4SET button:
To set calendar / clock / Interval time.
(1) Press the CLOCK( ) button to set the date and time.
(2) Press the INTV( ) button to set interval time.
○
5/UP/DOWN button:
Press or to increase or decrease number.
○
6FAST/SLOW button:
Press the button to set the time weighting to Fast or Slow.
○
7Leq/SPL button.
Press the button to Select Leq or SPL mode.

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DC Signal
AC Signal Ground
○
8MAX/MINbutton:
Press the button to enter the maximum and minimum recording mode.
Under this mode, the maximum 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 “ ”
symbol indicator and the minimum value on the display.
Pressing the 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 until
the “ ” symbol is disappeared.
○
9Back light button:
Press it to turn on the LCD backlight, which is making it easier to read in the
dark environment.
Press it again to turn off backlight. The backlight will turn itself off automatically
after 30 seconds.
○
10 A/C button:
Press the button to set the frequency weighting to A or C.
○
11 Start/Pause/Stop button:
Press the button to set the Leq measurement to continuance, pause or stop.
○
12 Microphone:
1/2 inch electret condenser microphone.
○
13 USB Interface:
Connect to a computer or external power supply input.
○
14 AC/DC signal output jack:
Connect the AC/DC output on the bottom of the unit to the level recorder.
AC: 1 Vrms Corresponding to 130dB. ( with frequency weighting )
DC: Output: 10mV/dB

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○
15 Tripod mounting thread:
For long-term measurements, the unit can be mounted on a camera tripod.
Proceed carefully to avoid dropping the unit.
○
16 Battery Compartment.
6. DATA LOGGER & INTERVAL SETUP
6.1 Recording Data:
Press the button to start recording the measured values. The values are
stored in a memory location. Press button again to stop recording.
Note:
During the recording period, most of the buttons, such as the and
are inoperative. All settings must be made before starting the record
operation.
LCD will show FULL symbol when 64000 recorders are stored in memory.
6.2 Recording Interval Setup:
(1) Press the button and then press the INTV( ) button, the “ Int ”
appears for interval, as well as a flashing second display.
(2) Now set the desired recording interval in minutes and seconds. Use the
or button to increase or decrease number. Max 1 minute can be set.
The minimum value is limited to “00:01”(=1s). Press INTV( ) to store the
setting and exit this mode. If you want to abort during a setup process, press
button to cancel.
6.3 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 "CLr"
symbol will appear on the display indicating that the
data have been erased.
Note:
The battery indicator “ ” shows the remaining
battery power. When battery power is extremely
low( ), recording function cannot be performed.

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Press button, LCD display will show “ Lo bat ”warning indication. If the
meter is under the record mode, it will stop automatically.
7. Leq & INTEGRATING SETUP
7.1 Setting The Integrating Measurement Time︰
(1) Press the button to enter time setup.
(2) Press the or button to select 10sec, 1min, 5min, 10min, 20min,
30min, 1hr, 2hr, 4hr, 8hr, 16hr, 24hr setting.
(3) Press button again to finish setting.
(4) Press button to exit setting anytime.
7.2 Equivalent Continuous Sound level(Leq) Measurement:
Press the button to select Leq or SPL.
Under Leq measurement, “Leq” symbol is displayed.
(1) Press the button to start, the “ ▶” symbol and the elapsed
measurement time are displayed.
(2) When the Leq measurement time is up, it will automatically terminate
and the “ ■ ” symbol is displayed.
(3) During the Leq measurement, the button can be pressed to
pause, stop or restart. During the pause period, the Leq measuring values
are not evaluated.
(4) During the pause, the pause symbol “ ” is displayed.
(5) To stop the measurement, press the button for 2 seconds.
(6) If an under or over range condition occurs during Leq measurement, the
or symbolwillbekeptonthedisplay.
(7) During this procedure, / / buttons are inoperative.
8. SETTING THE DATE AND TIME
The unit is equiptted with a clock to stamp the measuring date / time.
Date / Time setting Sequence: Year - Month - Day– Hour : Minute : Second
(1) Press the button and then press the CLOCK( ) button to enter
the date and time setting mode.
(2) Press CLOCK( ) button to select year, month, day, hour, minute,
second setup.