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.

2
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

3
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

4
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

5
DC 9V
OUTPUT
CAL
18
12
13
14
15
16
17
 Windscreen
 LCD
SYMBOL FUNCTION
LCD 4 digits
MAX Maximum hold
MIN Minimum hold

6
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

7
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

8
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

9
‘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.

10
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