VOLTCRAFT SL-300 User manual

SOUND LEVEL
METER
INSTRUCTION MANUAL
REC
FAST
A/C
1. SAFETY INFORMATION
Read the following safety information carefully
before attempting to operate or service the meter.

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Use the meter only as specified in this manual
zEnvironment conditions
 Altitude lower than 2000 meters
 Relatively humidity ≤90RH
 Operation Ambient 0 ~ 40
zMaintenance & Clearing
 Repair or servicing not covered in this
manual should be performed by qualified
personnel.
 Periodically wipe the case with a dry
cloth. Do not use solvents or eradicator on
this instrument.
zSafety symbols
Comply with EMC
2. FUNCTIONS DESCRIPTION
This Sound Level Meter is designed for
noise project; quality control; illness prevention and
cure and all kinds of environmental sounds
measurement. It is applied to the sounds
measurement at factory; school; office; traffic
access and household, etc.
zThis unit confirms to the IEC61672-1
CLASS2 for Sound Level Meters.
zMAX & MIN measurements
zOver range display
zUnder range display
zA & C Weighting

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zFAST & SLOW response
zAnalog AC/DC outputs for connection to
frequency analyzer or X-Y shaft recorder
3. SPECIFICATION
Standard applied: IEC61672 -1 CLASS2
Accuracy: +1.4dB
Frequency range: 31.5HZ ~ 8KHZ
Dynamic range: 50dB
Level ranges: LO30dB~80dB
Med50dB~100dB
Hi80dB~130dB
Auto30dB~130dB
Frequency weighting: A/C
Time weighting: FAST ( 125ms ), SLOW (
1s )
Microphone: 1/2 inch electret condenser
microphone
Display: 4 digits LCD display with a
resolution of 0.1dB
Display Update: 2 times/sec.
MAX hold: Hold the Maximum reading
MIN hold: Hold the Minimum reading
HOLD: Hold the readings
Alarm function: “OVER”is when input is
more than upper limit of range.
“UNDER”is when input is less than upper limit
of range.
Analog output : AC/DC outputs from

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earphone outlet
AC=1Vrms DC=10mV/dB
Data output : USB data traffic
Auto power off : Meter automatically shuts
down after approx. 15 minutes of inactivity.
Power supply : One 9V battery, 006P or
NEDA1604 or IEC 6F22.
Power life : About 50hours
Operation temperature and humidity:
0~40,10RH~90RH
Storage temperature and temperature:
-10~+6010RH~75RH
Dimension : 278 (L) x 76 (W) x 50(H) mm
Weight : 350g
Accessories : Instruction manual, battery,
screwdriver, 3.5mm earphone plug,
windscreen, software, USB cable, tripod and
DC 9V power supply.
4. NAME AND FUNCTIONS
REC
FAST
A/C
1
2
3
4
5
8
6
7
10
9
11

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DC 9V
OUTPUT
CAL
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12
13
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 Windscreen
 LCD
SYMBOL FUNCTION
LCD 4 digits
MAX Maximum hold
MIN Minimum hold

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OVER over range
UNDER under range
FAST Fast response
SLOW Slow response
dBA A-Weighting(responseto human
sense)
dBC C-Weighting(response to
machine monitor)
88—180 Range indicate
REC Recording data into computer
AUTO Auto level range selection
FULL Memory full
HOLD Data hold function
AutopoweroffPress the”SETUP“
button to disable power off
Low battery indicate
REC button
3.0 DATALOGGER function
Press “REC” button after it power on, the display
will show “REC” to start Data Recordingpress the
button again to delet the record (Note: In order to
avoid data error, please don’t power it off under
REC condition, when the REC function is deleted
then it can power off).
3.1 Adjusting DATALOGGER response

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Press the button continuously before power it
onthen press it will be displayed as
following
Press‘LEVEL’button to adjust memory timepress
‘HOLD’ button to hold the setup
3.2 Data zero function
Press the button continuously before power it
onloosen the
button when the display showing‘CLR’ after the
meter
power onwhich indicates that the data in
DATALOGGER has been deleted.
SETUP button
40The time chip adjustment
Press‘SETUP’button and then power it
onwhen‘TIME’symbol displays then
loosen‘SETUP’the meter will be under time
adjustment modeat the time the display will
show the date as following

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Press the‘SETUP’button second time, the display
showing
The display showing “minute” adjustment mode,
press ‘LEVEL’ to
make the adjustmentpress ‘HOLD’to keep the
setup
Press the‘SETUP’button third time, the display
showing
The display showing “hour” adjustment mode,
press ‘LEVEL’ to
make the adjustmentpress‘HOLD’to keep the
setup
Press the‘SETUP’button fourth time, the display
showing
The display showing “date” adjustment mode, press

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‘LEVEL’ to make the adjustmentpress‘HOLD’to
keep the setup
Press the‘SETUP’button fifth time, the display
showing
The display showing “month” adjustment mode,
press ‘LEVEL’ to
make the adjustmentpress ‘HOLD’ to keep the
setup
Press the‘SETUP’button sixth time, the display
showing
The display showing “year” adjustment mode,
press ‘LEVEL’ to
make the adjustmentpress ‘HOLD’to keep the
setup
Press the‘SETUP’button seventh and eighth time,
the display showing separately as following
The display showing default range, which can’t be
adjusted.

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Press the‘SETUP’button ninth time, the display
showing
The display showing initialization of the time
chiptime and date have returned to factory setup.
When the battery is exhausted or replaced, if the
time can’t be adjusted then please initialize the time
chip first.
41USB communications
settingturn on the meter, connect the meter
with the computer correctly, choose the software
COM3COM4then press ‘SETUP’‘ ’
disappears from the display to indicate and disable
auto power off, that the USB data is transmitting.
 FAST/SLOW button:
time weighting selection
FASTFast sampling measurement, 1 time per
125mS.
SLOWSlow sampling measurement, 1 time per
second.
MAX/MIN button: Maximum and Minimum

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hold
Press this button for one time to enter MAX/MIN
measurement, ‘MAX’ will appear on LCD,
maximum sound level will be captured and held
until higher sound level is captured. Press the
button again, ‘MIN’ will appear on LCD and
minimum sound level will be captured and held
until new lower sound level is captured. Press
the button one more time to exit MAX/MIN
measurement.
 LEVEL button: Level range selection
Each time you press “LEVEL” button, the
level range will change between ‘Lo’ level,
‘Med’ level, ‘Hi’ level and ‘Auto’ level in the
circular.
Backlight button
80Turn the backlight on/off
81DATALOGGER response
setting;
press the button continuously
until‘INT’symbol appears after the meter turn
on, press‘LEVEL’to set up the data memory
response, then press‘HOLD’to keep the setting.

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Frequency weighting select button
AA-Weighting
CC-Weighting
HOLD button:
Press “HOLD” button, The hold function freezes
the reading in the display.
Power button
Turn the meter power ON/OFF
External DC 9V power supply terminal
For connection with DC 9V power supply.
Aperture size: external diameter: 3.5mm,
internal diameter: 1.35mm
USB interface
USB signal output is a 9600 bps serial
interface.
 AC/DC signal output earphone outlet
OUTPUT
GROUND
OUTPUT
AC
DC
ACOutput voltage1Vrms corresponding to
each range step.
Output impedance 100Ω

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DCOutput voltage10mv/dB
Output impedance 1KΩ
Calibration potentiometerCALL
For external standard level calibration
adjustments.
 Tripod mounting screw
 Battery cover
 Microphone
1/2 inch Electret Condenser microphone
5. CALIBRATION PROCEDURES
 Make the following switch
settings:
Frequency weighting: A-weighting
Time weighting: FAST
Level range: 50 ~100dB
Insert the microphone housing carefully
into the 1/2 inch insertion hole of the
calibrator94dB @ 1KHZ.
Turn on the switch of calibrator and
adjust the CALL potentiometer of the
unit 94.0dB is displayed.
NOTE: All products are well calibrated
before shipment. Recommended
recalibration cycle: 1 year.

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AcousticCalibrat or
REC
FAST
A/C
DC9V
OUTPUT
CAL
6. MEASUREMENT PREPARATION
 Remove the battery cover on the back
and put in one 9V battery.
 Recover the back cover.
 When battery voltage drops below the
operating voltage or battery aging, this
symbol will appear on LCD. Replace
the 9V battery.
When the AC adapter is used, insert the
plug of the adapter 3.5φ into the DC
9V connector on the side panel.
7. OPERATING PROCEDURE
1 Power on the meter.
2 Press ‘LEVEL’ button to select desired level,
base on ‘UNDER’ or ‘OVER’ do not appear on
LCD.
3 Select ‘dBA’ for general noise sound level and
‘dBC’ for measuring sound level of acoustic
material.
4 Select ‘FAST’ for instant sound and ‘SLOW’ for
average sound level.
5 Select ‘MAX/MIN’ button for measuring

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maximum and minimum noise level.
6 When time setting is needed, press and hold
‘SETUP’ button and then power on the meter.
Release ‘SETUP’ button after ‘TIME’ appears
on LCD. Adjust minute when ‘F’ appears and
adjust hour when ‘S’ appears. Press third time
to initialize the time chip. After replacing battery
for the new meter, it’s necessary to initialize the
time chip first. Then press ‘SEVEL’ button to
adjust time and press ‘HOLD’ to store the new
data.
7 Hold the instrument comfortable in hand or fix
on tripod and measure sound level at a
distance of 1~1.5 meter.
8. NOTICE
i. Do not store or operate the instrument
at high temperature and high humidity
environment.
ii. When not in use for long time, please
take out the battery to avoid battery
liquid leakage and cautery on the
instrument.
iii. When using the instrument in the
presence of wind, it is a must to
mount the windscreen to not pick up
undesirable signals.
iv. Keep microphone dry and avoid
severe vibration.

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9. accessories:
 installation CD
 USB interface cable
 screwdriver
 tripod
 windscreen
 DC 9V power supply.
10. Installing the software
1.0 Start windows
1.1 Insert the CD into the CD-drive.
1.2 Run SETUP.EXE installation
program in file DISK1, install it to the
referred directory
1.3 install CP2102 drive software
Connecting the meter with the computer
by USB interface, install CP2102 drive
software in my computer
property:\hardware\facility management\
COM CP210X USB.
USB Drive Installation
1. Copy the CP2101WIN Drivers to a certain directory,
usb_driver.
2. Connect the USB to the computer, the Windows
system will show finding a new hardware.
Choose specific directory C:\ usb_driver
according to the instruction.

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3. After Driver installation, a new COM port will be
added to the Ports in the Device Manager. Port
number will be ranged following the primary
COM ports, such as: COM3 or COM4.
4. Entry IR365 Application and choose the correct
COM port. Communication can be start after
pressing ON-LINE.
1.4 Once the drive software is installed, start the
application software, connect the meter to the
computer by USB, then search for the COMX port
occupied by CP210X press
buttonthe‘ ’ symbol will not appear on the
displaywhich indicate the meter is transmitting
data to the computer.
1.5 Enter the menu REAL TIME\‘SETUP’to set the
monitoring data(data volume, response, monitoring
time)

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1.6
DATALOGGER menu:
The computer read the memory data in the meter
when REC not appear on the display and the
connection is in order.