Besantek BST-SL2 User manual

SOUND LEVEL METER
BST-SL2
INSTRUCTION MANUAL

Index
1.Introduction .........................................
2.Specications.......................................
3.Instrument Layout................................
4.Operation.............................................
5.Frequency Weighting...........................
6.Battery Replacement...........................
7.Cleaning and Storage..........................
Page
1
2-3
4-5
6
7
8
8

-1-
1. Introduction
NOTE
This meter has been designed and tested according
to IEC651 TYPE2, ANSI S1.4 TYEP2 for noise
measurement.
● A and C frequency weighting selection.
● Fast and Slow detector-indicator charateristics.
● Max and Min hold indicator.
● Over range indicator.
● Bargraph display.
● AC signal output.

-2-
2. Specications
● Standard : IEC651 TYPE2, ANSI S1.4 TYPE2.
● Accuracy : 1.5dB (@94dB of 1kHz, @straight
direction).
● Frequency response : Refer to page 7.
● 3 Ranges : 30dB ~ 80dB
50dB ~ 100dB
80dB ~ 130dB
※Measurement range is from 30dB to 130dB.
● Frequency weighting characteristics : A , C.
Time weighting characteristics : F Fast
S Slow
Averaging time : F 125ms
S 1000ms
● Microphone : ¼ inch ECM.
● Display : 3½ digits with bargraph.
Sampling rate : 2 per second.
● Max. Hold
● Min. Hold
● Over range indicators : ◄: under
►: over
● dB output : AC signal, 1V full scale for every range;
output impedance is about 100Ω.
● Low battery indicator :
● Battery : 9V 006P, 6F22 or equivalent (alkaline).

-3-
● Battery life : about 70 hours.
● Temperature & Humidity :
0°C ~ 40°C, 90% RH Max. for using.
-10°C ~ 60°C, 75% RH Max. for storage.
● Dimensions : 240mm(L) x 62mm(W) x 39mm(D).
● Weight : Approx. 224g (battery included).
● Accessories : Instruction Manual
Battery
Carrying Bag
Wind Shield
Calibration screw driver.

-4-
(5)
(2)
(3)
(7)
(1)
(4)
(6)
3. Instrument Layout
(1) Wind Shied :
Reduce the noise from
wind blow.
(2) LCD
(3) ON / OFF Button :
Press ON or OFF power.
(4) MAX / MIN Button :
Press once for MAX to
read the MAX value, then
Press again for MIN to
read the MIN value.
Press again, cancel the
function.
(5) A / C :
Select A or C frequency
weighting characteristic.
(6) FAST / SLOW :
Select FAST or SLOW
function.
(7) Level :
Select 30 ~ 80dB
50 ~ 100dB
80 ~ 130dB
range

-5-
(8)
(10)
(9)
(11)
(8) Output : AC output 1 Vrms for full scale (50dB).
(9) Calibration Hole :
Use screw driver and Sound generator to calibrate
at 94dB, 1kHz on 50 ~ 100dB range.
(10) Battery cover.
(11) Clip.

-6-
4. Operation
(1) Press ON / OFF button to turn on power.
(2) Press LEVEL to select the range you want.
(3) Read the value directly from the LCD display.
(4) If under range, the ◄ symbol is blinking; and the
► symbol is blinking if over range. Please charge
the range for proper use.
(5) Select dBA for human hearing or select dBC for
mechanical noise.
(6) You can read MAX or MIN Value by pressing
MAX / MIN key. But if out of range, function will be
cancelled automatically.

-7-
5. Frequency Weighting
According to IEC 651, the meter should meet the
requirement as below :
Nominal
Frequency
(Hz)
A Weighting C Weighting
Tolerance
(IEC 651
Type 2)
31.5 -39.4dB -3.0dB ±2dB
50 -30.2dB -1.3dB ±2dB
80 -22.5dB -0.5dB ±2dB
125 -16.1dB -0.2dB ±1.5dB
200 -10.9dB 0 ±1.5dB
315 -6.6dB 0±1.5dB
500 -3.2dB 0±1.5dB
800 -0.8dB 0 ±1.5dB
1250 +0.6dB 0 ±1.5dB
2000 +1.2dB -0.2dB ±2dB
3150 +1.2dB -0.5dB ±2.5dB
5000 +0.5dB -1.3dB ±3.5dB
8000 +1.1dB -3.0dB ±5dB

-8-
6. Battery Replacement
When low battery indicator is showed. Use a
screwdriver to remove the battery cover.
Replace the old battery with one 9V 006P or
equivalent, then reinstate the battery cover.
7. Cleaning and Storage
Periodically, wipe the case with a damp cloth and
detergent; do not use abrasives or solvents.
If meter is not to be used for periods longer than 60
days, remove the batteries and store them separately.
Due to our policy of constant improvement and development, we
reserve the right to change specications without notice.
WARNING
To avoid electrical shock or damage to the meter,
do not get water inside the case.