MRC SL-4035SD, SL-4023SD Operation Manual

Sound Level Meter

SL-4035SD

Operation Manual

PLEASE READ THIS MANUAL CAREFULLY BEFORE OPERATION

Hagavish st. Israel 58817 Tel: [phone], Fax: [phone] [e-mail]

MRC.8.16

TABLE OF CONTENTS

1. FEATURES................................................................................ 1

2. SPECIFICATIONS..................................................................... 2

3. FRONT PANEL DESCRIPTION................................................

.

6

4. MEASURING PROCEDURE.....................................................

.

7

4-1 Sound Pressure Measurements (SPL)....................................... 7

4-2 Integrating Sound Level Meter Measurements (Leq).................

.

8

4-3 Data Hold.................................................................................... 10

4-4 Data Record ( Max., Min. reading )............................................. 11

5. DATALOGGER.......................................................................... 12

5-1 Preparation before execute datalogger function......................... 12

5-2 Auto Datalogger ( Set sampling time ≧ 1 second )..................

.

12

5-3 Manual Datalogger ( Set sampling time = 0 second )................ 14

5-4 Check time and sampleing time information............................... 14

5-5 SD Card Data structure..............................................................

.

15

6. Saving data from the SD card to the computer.......................... 16

7. ADVANCED SETTING..............................................................

.

18

7-1 Set clock time ( Year/Month/Date, Hour/Minute/ Second )......... 18

7-2 Set sampling time ......................................................................

.

19

7-3 Auto power OFF management ..................................................

.

19

7-4 Set beeper Sound ON/OFF........................................................

.

20

7-5 Decimal point of SD card setting................................................

.

20

7-6 SD memory card format.............................................................. 21

7-7 Frequency weighting to A or C setting..................................... 21

8. POWER SUPPLY from DC ADAPTER...................................... 22

9. BATTERY REPLACEMENT......................................................

.

23

10. RS232 PC serial interface........................................................ 23

11 CALIBRATION .........................................................................

.

25

12. FREQUENCY WEIGHTING CHARACTERISTICS

OF A & C NETWORKS............................................................

25

13. TIME WEIGHTING (FAST & SLOW)

CHARACTERISTICS...............................................................

26

14. PATENT................................................................................... 26

1. FEATURES

* Frequency and Time weighting are designed to meet IEC 61672 class 2.
* The meter with programmable integrating time provides precise linearity

over a wide range (100dB) and displays Leq and SPL measurements.

* A & C weighting networks comply with standards.
* 0.5" standard microphone head.
* Time weighting (Fast & Slow) dynamic characteristic modes.
* Build External calibration VR.
* Auto range & Manual range selection.
* Condenser microphone for high accuracy & long-term stability.
* Memory function to store the Max. & Min. value.
* Hold and Peak Hold functions.
*

Real time SD memory card Datalogger, it Built-in Clock
and Calendar, real time data recorder, sampling time set
from 1 second to 3600 seconds.

* Manual datalogger is available ( set the sampling

time to 0 second ), during execute the manual datalogger
function, it can set the different position ( location ) No.
( position 1 to position 99 ).

* Innovation and easy operation, computer is not need to

setup extra software, after execute datalogger, just take
away the SD card from the meter and plug in the SD card
into the computer, it can download the all the measured
value with the time information ( year/month/date/
hour/minute/second ) to the Excel directly, then user can
make the further data or graphic analysis by themselves.

* SD card capacity : 1 GB to 16 GB.
* LCD with green light backlight, easy reading.
* Can default auto power off or manual power off.
* Data hold, record max. and min. reading.
* Microcomputer circuit, high accuracy.
* Power by UM3/AA ( 1.5 V ) x 6 batteries or DC 9V adapter.
* RS232/USB PC COMPUTER interface.
* Heavy duty & compact housing case.

Leq, SEL, SPL, MAX-L, and MIN-L measurements.

1

2. SPECIFICATIONS

Circuit Custom one-chip of microprocessor LSI

circuit.

Display LCD size : 52 mm x 32 mm

LCD with green backlight ( ON/OFF ).

Measurement

SPL : Sound pressure level

Type

Leq : Equivalent Continuous Noise Level

Measurement 30 - 130 dB.
Range
Resolution 0.1 dB.
Function dB ( A & C frequency weighting ),

Time weighting ( Fast, Slow ),
Peak hold, Data hold
Record ( Max., Min. ).

Accuracy Characteristics of " A " frequency
(23 ±5 ℃)

weighting network meet IEC 61672
class 2

Under 94 dB input signal, the accuracy
are :

31.5 Hz ±3.5 dB
63 Hz ±2.5 dB
125 Hz ±2.0 dB
250 Hz ±1.9 dB
500 Hz ±1.9 dB
1 K Hz ±1.4 dB
2 K Hz ±2.6 dB
4 K Hz ±3.6 dB
8 K Hz ±5.6 dB

Remark :
The above spec. are tested under the
environment RF Field Strength less
than 3 V/M & frequency less than 30
MHz only.

2

Frequency Characteristics of A & C.
Weighting
Network A weighting :

The characteristic is simulated as "Human
Ear Listing" response. Typical, if making
the environmental sound level
measurement, always select to A
weighting.

C weighting
The characteristic is near the "FLAT"
response. Typical, it is suitable for
checking the noise of machinery (Q.C.
check) & knowing the sound pressure

level of the tested equipment.
Time Fast - t = 125 ms
weighting * "Fast" range is simulated the human ear
(Fast & Slow) response time weighting.

Slow - t = 1 s

* "Slow" range is easy to get the average

values of vibration sound level.
Data hold To freeze the measurement value.
Peak hold To keep the peak ( max. ) measurement

value.
Range selecto

r

Auto range : 30 to 130 dB.

Manual range :

2 range, 30 to 80 dB,
80 to 130 dB, 50 dB on each step,

with over & under range indicating.
Frequency 31.5 to 8,000 Hz.
Microphone Electric condenser microphone.
type
Microphone Out size, 12.7 mm DIA. ( 1/2 inch).
size

3

Calibration VR Build in external calibration VR, easy to

calibrate on 94 dB level by screw driver.

*

Calibrated via external SOUND

CALIBRATOR ( SC-942, optional ).
Calibrator B & K (Bruel & kjaer), MULTIFUNCTION

ACOUSTIC CALIBRATOR Type 4226.
Datalogger Auto 1 second to 3600 seconds
Sampling Time

@ Sampling time can set to 1 second,

Setting range but memory data may loss.

Manual Push the data logger button

once will save data one time.

@ Set the sampling time to

0 second.

@ Manual mode, can also select the

1 to 99 position ( Location ) no.

Memory Card SD memory card. 1 GB to 16 GB.
Advanced

*

Set clock time ( Year/Month/Date,Hour/Minute/ Second )

setting

*

Set sampling time

*

Auto power OFF management

*

Set beep Sound ON/OFF

*

Decimal point of SD card setting

*

SD memory card Format

*

Frequency weighting to A or C setting

Over Indication Show " - - - - ".
Data Hold Freeze the display reading.
Memory Recall Maximum & Minimum value.
Sampling Time Approx. 1 second.
of Display
Data Output RS 232/USB PC computer interface.

* Connect the optional RS232 cable

UPCB-02 will get the RS232 plug.

* Connect the optional USB cable

USB-01 will get the USB plug.

AC output AC 0.5 Vrms corresponding to each

range step.

* Output impedance : 600 ohm.

4

Power off Auto shut off saves battery life or

manual off by push button.
Operating

0 to 50 ℃.
Temperature

Operating Less than 85% R.H.
Humidity
Power Supply

*

Alkaline or heavy duty DC 1.5 V batter

y

( UM3, AA ) x 6 PCs, or equivalent.

*

DC 9V adapter input. ( AC/DC powe

r

adapter is optional ).

Power Current Normal operation ( w/o SD card save

data and LCD Backlight is OFF) :

Approx. DC 12 mA.

When SD card save the data but and

LCD Backlight is OFF) :

Approx. DC 51 mA.

*

If LCD backlight on, the powe

r

consumption will increase approx.
30 mA.

Weight 489 g/1.08 LB.
Dimension 245 x 68 x 45 mm.

( 9.6 x 2.7x 1.9 inch ).
Accessories

*

Instruction manual........................................ 1 PC

Included

*

Hard carrying case, CA-06........................... 1 PC

Optional

*

Sound calibrator ( 94 dB ), SC-941.

Accessories

*

Sound calibrator ( 94/114 dB ), SC-942.

*

Sound wind shield ball, SB-01

*

SD Card ( 2 GB )

*

USB cable, USB-01.

*

RS232 cable, UPCB-02.

*

Data Acquisition software,
SW-U801-WIN.

*

AC to DC 9V adapter.

*

Soft carrying case, CA-05A.

5

3. FRONT PANEL DESCRIPTION

Fig. 1

3-1 Display. 3-11 Calibration VR
3-2 Power Button ( ESC, Backlight Button 3-12 RS-232 output terminal
3-3 Hold Button 3-13 DC 9V adapter socket.
3-4 REC Button 3-14 Tripod Fix Nut
3-5 Range Button ( ▲ Button )

3-15 Battery Cover Screws

3-6 Fast/Slow Button/ Peak ( ▼ Button )

3-16 Stand
3-6 SET Button ( Time Button ) 3-17 Battery compartment/Cover
3-8 ENTER Button ( Logger Button ) 3-18 SD card socket
3-9 Microphone 3-19 Button
3-10 AC output terminal 3-20 Integ Time Button

6

4. MEASURING PROCEDURE

4-1 Sound Pressure Measurements (SPL

)

In SPL mode the display shows readings of

the sound pressure level.

1) Power ON the meter by pressing and holding the " Powe

r

Button " ( 3-2, Fig. 1 )for at least 1.5 seconds,
the meter's default function is " A frequency weighting ,
" SPL " " & " Fast time weighting "&" Auto range ". The
LCD display will show the Symbol " A.SPL, Fast , Auto ".

2)

Frequency weighting select
How to select the frequency weighting ( A or C), the
procedures please refer to chapter 7-7 page 21 .

Note :
a.

The characteristic table of A,C weighting, pleas

e

ref. page 25.

b.

The characteristic of A weighting is simulated as the

" Human Ear Listening " response.

Typically always select the A weighting when make

s

environmental sound level measurement.

c. The C weighting characteristic is near the " FLAT

"

response. Typically it is suitable for checking the
noise of machinery ( Q.C. check ) & knowing the
real sound level of the tested equipment.

3)

Determine proper measuring range by pressing and holding
the " Range Button " ( 3-5, Fig. 1 ) for at least 1.5 seconds.
until the desired range is shown (AUTO , 30 - 80 , 80 - 130db ,
AUTO) reading in the center of the range. If dashes appear
on the display select a new range , After power on the default
range is " Auto range " In the same time the LCD display
will show the text of " Auto " Under the auto range.

7