MRC SL-4023SD Sound Level Meter 30-130dB+data logger Manual

TABLE OF CONTENTS

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

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

3. FRONT PANEL DESCRIPTION....................................................6

3-1 Display..............................................................................6

3-2 Power Button ( ESC, Backlight Button )................................6

3-3 Hold Button ( Next Button ).................................................6

3-4 REC Button ( Enter Button )...............................................6

3-5 Range Button ( Button, Time Check Button )...................

▲

3-6 A/C Button ( Button, Sampling check Button )..................

6

▼

6

3-7 Fast/Slow Button ( SET Button ).........................................6

3-8 Peak Hold Button ( Logger Button ).....................................6

3-9 Microphone........................................................................6

3-10 AC output terminal...........................................................6

3-11 Calibration VR..................................................................6

3-12 RS-232 output terminal.....................................................6

3-13 DC 9V adapter socket.......................................................6

3-14 Tripod Fix Nut..................................................................6

3-15 Battery Cover Screws........................................................6

3-16 Stand..............................................................................6

3-17 Battery compartment/Cover...............................................6

3-18 SD card socket.................................................................6

4. MEASURING PROCEDURE.........................................................7

5. DATALOGGER..........................................................................9

5-1 Preparation before execute datalogger function....................9

≧

10

5-3 Manual Datalogger ( Set sampling time = 0 second )............11

5-4 Check time information.......................................................12

5-5 Check sampling time information.........................................12

5-6 SD Card Data structure.......................................................12

6. Saving data from the SD card to the computer........................... 14

7. ADVANCED SETTING................................................................15

7-1 Set clock time ( Year/Month/Date, Hour/Minute/ Second )..... 16

7-2 Decimal point of SD card setting..........................................17

7-3 Auto power OFF management ............................................17

7-4 Set beeper Sound ON/OFF.................................................. 18

7-5 Set sampling time ..............................................................18

7-6 SD memory card format......................................................19

8. POWER SUPPLY from DC ADAPTER............................................19

9. BATTERY REPLACEMENT.......................................................... 19

10. RS232 PC serial interface........................................................ 20

11CALIBRATION .........................................................................21

12. FREQUENCY WEIGHTING CHARACTERISTICS

OF A & C NETWORKS.............................................................22

13. TIME WEIGHTING (FAST & SLOW)

CHARACTERISTICS................................................................ 22

14. PATENT.................................................................................23

1. FEATURES

* Main functions are designed to meet IEC 61672 class 2.

* 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.

* Available for external calibration adjustment.

* 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.

1

2. SPECIFICATIONS

Circuit

Display

Custom one-chip of microprocessor LSI circuit.

LCD size : 52 mm x 38 mm

LCD with green backlight ( ON/OFF ).

Measurement 30 - 130 dB.

Range

Resolution 0.1 dB.

Function

Accuracy

℃ dB ( A & C frequency weighting ),

Time weighting ( Fast, Slow ),

Peak hold, Data hold

Record ( Max., Min. ).

Characteristics of " A " frequency 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

Weighting

Network

Characteristics of A & C.

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 weighting

Fast - t= 200 ms

* "Fast" range is simulated the human ear

(Fast & Slow) response time weighting.

Slow - t = 500 ms

Data hold

Peak hold

Range selector

* "Slow" range is easy to get the average

values of vibration sound level.

To freeze the measurement value.

To keep the peak ( max. ) measurement value.

Auto range :

Manual range :

30 to 130 dB.

3 range, 30 to 80 dB, 50 to 100 dB,

80 to 130 dB, 50 dB on each step, with over & under range indicating.

31.5 to 8,000 Hz.

Frequency

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-941, optional ).

Calibrator

Datalogger

Sampling Time

Setting range

B & K (Bruel & kjaer), MULTIFUNCTION

ACOUSTIC CALIBRATOR 4226.

Auto 1 second to 3600 seconds

@ Sampling time can set to 1 second, 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, setting

Hour/Minute/ Second )

* Decimal point of SD card setting

* Auto power OFF management

* Set beep Sound ON/OFF

* Set sampling time

* SD memory card Format

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.

AC output

* 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 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

Temperature

Operating

Humidity

Power Supply

Less than 85% R.H.

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.

* AIf LCD backlight on, the power

Weight

Dimension

Accessories

consumption will increase approx.

30 mA.

489 g/1.08 LB.

245 x 68 x 45 mm.

( 9.6 x 2.7x 1.9 inch ).

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

Included

Optional

Accessories

* A

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

* A

adapter is optional ).

* Sound calibrator ( 94 dB ), SC-941.

* 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.

* Hard carrying case, CA-06.

5

3. FRONT PANEL DESCRIPTION

3-1 Display.

3-2 Power Button ( ESC, Backlight Button )

3-3 Hold Button ( Next Button )

3-4 REC Button ( Enter Button )

▼

3-7 Fast/Slow Button ( SET Button )

3-8 Peak Hold Button ( Logger Button )

3-9 Microphone

3-10 AC output terminal

3-11 Calibration VR

3-12 RS-232 output terminal

3-13 DC 9V adapter socket.

3-14 Tripod Fix Nut

3-15 Battery Cover Screws

3-16 Stand

3-17 Battery compartment/Cover

3-18 SD card socket

6

Fig. 1

4. MEASURING PROCEDURE

4-1 Sound level meter

1) Power on by pressing the " Power On/Off Button " ( 3-2,

Fig. 1 ) , the meter's default function is " Auto range ",

" A frequency weighting " & " Fast time weighting ". The

LCD display will show the unit " A. Fast Auto ".

2) Select " A " or " C " frequency weighting by pressing the

" A/C Button " ( 3-6, Fig. 1 ) .

Note : a. The characteristic table of A, C weighting, please ref. page 22.

b. The characteristic of A weighting is simulated as the " Human Ear Listening " response.

Typically always select the A weighting when makes

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 the

" Range Button " ( 3-5, Fig. 1 ).

After power on the default range is " Auto range ".

In the same time the lower right display will show the text of " Auto ".

Under the auto range, press the " Range Button " ( 3-5,

Fig. 1 ) once step by step will enter to the manual range ( range 1, range 2, range 3 ) and auto range in sequence. There are still 3 manual ranges for your choice :

7

*

*

*

Manual range 1 , 30 - 80 dB range :

Display will show the unit of " 30 - 80 ".

Manual range 2 , 50 - 100 dB range :

Display will show the unit of " 50 - 100 ".

Manual range 3 , 80 - 130 dB range :

Display will show the unit of " 80 - 130 ".

4)

According to various measuring sound source, select the

Time Weighting ( Fast or Slow ) by pressing the " Time

Weighting Button " ( 3-7, Fig. 1 ).

Note : a. If select the function of " Fast " time weighting, the display will show the unit of " FAST".

b. If select the function of " Slow " time weighting, the display will show the unit of " SLOW ".

4-2 Data Hold

During the measurement, press the " Hold Button " ( 3-3,

Fig. 1 ) once will hold the measured value & the LCD will display a " HOLD " symbol.

Press the " Hold Button " once again will release the data hold function.

4-3 Data Record ( Max., Min. reading )

1)The data record function records the maximum and minimum readings. Press the " REC Button " ( 3-4, Fig.

1 ) once to start the Data Record function and there will be a " REC " symbol on the display.

2)With the " REC " symbol on the display : a) Press the " REC Button " ( 3-4, Fig. 1 ) once, the

" REC MAX " symbol along with the maximum value will appear on the display.

If intend to delete the maximum value, just press the " Hold Button " ( 3-3, Fig. 1 ) once, the display will show the " REC " symbol only & execute the memory function continuously.

8

b)Press the " REC Button " ( 3-4, Fig. 1 ) again, the

" REC MIN " symbol along with the minimum value will appear on the display.

If intend to delete the minimum value, just press the

" Hold Button " ( 3-3, Fig. 1 ) once, the display will show the " REC " symbol only & execute the memory function continuously.

c) To exit the memory record function, just press the

" REC " button > 2 seconds at least. The display will revert to the current reading.

4-4 LCD Backlight ON/OFF

After power ON, the " LCD Backlight " will light automatically. During the measurement, press the

" Backlight Button " ( 3-2, Fig. 1 ) once will turn OFF the

" LCD Backlight ".

Press the " Backlight Button " once again will turn ON the

" LCD Backlight " again.

5. DATALOGGER

5-1 Preparation before execute datalogger function

a. Insert the SD card

Prepare a " SD memory card " ( 1 GB to 16 GB, optional ), insert the SD card into the " SD card socket " ( 3-18, Fig. 1).

The front panel of the SD card should face against the the down case.

b. SD card Format

If SD card just the first time use into the meter, it recommend to make the " SD card Format " at first. , please refer chapter 7-6 ( page 19 ).

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c. Time setting

If the meter is used at first time, it should to adjust the clock time exactly, please refer chapter 7-1 ( page 16 ).

d. Decimal format setting

The numerical data structure of SD card is default used the " . " as the decimal, for example "20.6" "1000.53" . But in certain countries ( Europe ...) is used the " , " as the decimal point, for example " 20, 6 "

"1000,53". Under such situation, it should change the Decimal character at first, details of setting the Decimal point, refer to Chapter

7-2, page 17.

a. Start the datalogger

Press the " REC Button ( 3-4, Fig. 1 ) once , the LCD will show the text " REC ", then press the " Logger Button "

( 3-8, Fig. 1 ), the " REC " will flashing, at the same time the measuring data along the time information will be saved into the memory circuit.

The Display will show also show text " LOGGER " when the data save into the memory circuit.

Remark :

How to set the sampling time, refer to Chapter 7-5, page 18.

10

b. Pause the datalogger

During execute the Datalogger function , if press the

" Logger Button " ( 3-8, Fig. 1 ) once will pause the

Datalogger function ( stop to save the measuring data into the memory circuit temporally ). In the same time the text of " REC " will stop flashing.

Remark :

If press the " Logger Button " ( 3-8, Fig. 1 ) once again will execute the Datalogger again, the text of " REC " will flashing .

c. Finish the Datalogger

During pause the Datalogger, press the " REC Button "

( 3-4, Fig. 1) continuously at least two seconds, the " REC " indicator will be disappeared and finish the Datalogger.

Remark :

When the battery is under the low battery condition

( show the low battery indicator ), the Datalogger function is disable.

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

a. Set sampling time is to 0 second

Press the " REC Button ( 3-4, Fig. 1 ) once , the LCD will show the text " REC ", then press the " Logger Button "

( 3-8, Fig. 1 ) once, the " REC " will flashing once , at the same time the measuring data along the time information and the Position no. will be saved into the memory circuit.

11

Remark :

* Lower Display will show the Position/Location no.

( P1, P2... P99 ) .

* During execute the Manual Datalogger, press the " SET Button " ( 3-7, Fig. 1 ) once, then use the " Button " ( 3-5, Fig. 1) or " Button " ( 3-6,

Fig. 1 ) to set the measuring position ( 1 to 99, for example room 1 to room 99 ) to identify the measurement location. After finish the adjustment location no., press the " Enter Button " to entry.

b. Finish the Datalogger

Press the " REC Button " ( 3-4, Fig. 1) continuously at least two seconds, the " REC " indication will be disappeared and finish the Datalogger.

5-4 Check time information

During the measurement if press " Time check Button "

( 3-5, Fig. 1 ) > 2 seconds, the lower LCD display will present the time information of Year/Month, Date/Hour,

Minute/Second.

5-5 Check sampling time information

During the measurement , If press " Sampling Check

Button " ( 3-6, Fig. 1 ) > 2 seconds, the lower LCD display will present the Sampling time information in second unit.

5-6 SD Card Data structure

1) When the SD card is used into the meter, the SD card

When the first time, the SD card is used into the meter, the SD card will generate a folder :

SLA01

12

2)If the first time to execute the Datalogger, under the route SLA01\, will generate a new file name SLA01001.XLS.

After exist the Datalogger, then execute again, the data will save to the SLA01001.XLS until

Data column reach to 30,000 columns, then will generate a new file, for example SLA01002.XLS

3)Under the folder SLA01\, if the total files more than 99 files, will generate anew route, such as

SLA02\ ........

4)The file's route structure :

SLA01\

SLA01001.XLS

SLA01002.XLS

.....................

SLA01099.XLS

SLA02\

SLA02001.XLS

SLA02002.XLS

.....................

SLA02099.XLS

SLAXX\

.....................

.....................

Remark : XX : Max. value is 10.

13

6. Saving data from the SD card

to the computer ( EXCEL software )

1)After execute the Data Logger function, take away the

SD card out from the " SD card socket " ( 3-18, Fig. 1 ).

2)Plug in the SD card into the Computer's SD card slot

( if your computer build in this installation ) or insert the SD card into the " SD card adapter ". then connect the " SD card adapter " into the computer.

3)Power ON the computer and run the " EXCEL software ".

Down load the saving data file ( for example the file name : SLA01001.XLS, SLA01002.XLS ) from the SD card to the computer. The saving data will present into the EXCEL software screen ( for example as following

EXCEL data screens ) , then user can use those EXCEL data to make the further Data or Graphic analysis usefully.

EXCEL data screen ( for example )

14

EXCEL graphic screen ( for example )

7. ADVANCED SETTING

Under do not execute the Datalogger function, press the " SET Button " ( 3-7, Fig. 1 ) continuously at least two seconds will enter the " Advanced Setting " mode.

then press the " Next Button " (3-3, Fig. 1 ) once a while in sequence to select the six main function, the lower display will show :

dAtE......Set clock time ( Year/Month/Date, Hour/Minute/

Second )

dEC.......Set SD card Decimal character

PoFF..... Auto power OFF management

bEEP.....Set beeper sound ON/OFF

SP-t...... Set sampling time

Sd-F..... SD memory card Format

15

Remark :

During execute the " Advanced Setting " function, if press " ESC Button " ( 3-2, Fig. 1 ) once will exit the " Advanced Setting " function, the LCD will return to normal screen.

7-1 Set clock time ( Year/Month/Date,

Hour/Minute/ Second )

When the lower display show " dAtE "

1)Press the " Enter Button " ( 3-4, Fig. 1 ) once,

Use the " Button " ( 3-5, Fig. 1 ) or " Button "

( 3-6, Fig. 1 ) to adjust the value ( Setting start from

Year value ). After the desired value is set, press the

" Enter Button " ( 3-4, Fig. 1 ) once will going to next value adjustment ( for example, first setting value is Year then next to adjust Month, Date, Hour,

Minute, Second value ).

2)After set all the time value ( Year, Month, Date, Hour,

Minute, Second ), the screen will jump to " SD card Decimal character " setting screen ( Chapter 7-2 ).

Remark :

After the time value is setting, the internal clock will run precisely even Power is off ( The battery is under normal condition, no low battery condition ).

16

7-2 Decimal point of SD card setting

The numerical data structure of SD card is default used the " . " as the decimal, for example "20.6" "1000.53" .

But in certain countries ( Europe ...) is used the " , " as the decimal point, for example " 20,6 " "1000,53".

Under such situation, it should change the Decimal character at first.

When the lower display show " dEC "

▲

( 3-6, Fig. 1 ) to select the upper value to " bASIC " or

" Euro ".

bASIC - Use " . " as the Decimal point with default.

Euro - Use " , " as the Decimal point with default.

2)After select the upper text to " bASIC " or " Euro ", press the " Enter Button " ( 3-4, Fig. 1 ) will save the setting function with default.

7-3 Auto power OFF management

When the lower display show " PoFF "

1)Use the " Button " ( 3-5, Fig. 1 ) or " Button "

( 3-6, Fig. 1 ) to select the upper value to " yES " or

" no ".

yES - Auto Power Off management will enable.

no - Auto Power Off management will disable.

2)After select the upper text to " yES " or " no ", press the

" Enter Button " ( 3-4, Fig. 1 ) will save the setting function with default.

17

7-4 Set beeper sound ON/OFF

When the lower display show " bEEP "

1)Use the " Button " ( 3-5, Fig. 1 ) or " Button "

( 3-6, Fig. 1 ) to select the upper value to " yES " or

" no ".

yES - Meter's beep sound will be ON with default.

no - Meter's beep sound will be OFF with default.

2)After select the upper text to " yES " or " no ", press the

" Enter Button " ( 3-4, Fig. 1 ) will save the setting function with default.

Remark :

After execute the datalogger function, the buzzer sound will off automatically to prevent any interference of the measurement.

7-5 Set sampling time ( seconds )

When the lower display show " SP-t "

1)Use the " Button " ( 3-5, Fig. 1 ) or " Button " (

3-6, Fig. 1 ) to adjust the value ( 0, 1, 2, 5, 10, 30,60,

120, 300, 600, 1800,3600 seconds ).

Remark :

If select the sampling time to " 0 second ", it is ready for manual Datalogger.

2)After the Sampling value is selected, press the

" Enter Button " ( 3-4, Fig. 1 ) will save the setting function with default.

18

7-6 SD memory card Format

When the lower display show " Sd F "

1)Use the " Button " ( 3-5, Fig. 1 ) or " Button " (

3-6, Fig. 1 ) to select the upper value to " yES " or

" no ".

yES - Intend to format the SD memory card no - Not execute the SD memory card format

2)If select the upper to " yES ", press the " Enter Button

" ( 3-4, Fig. 1 ) once again, the Display will show text

" yES Ent " to confirm again, if make sure to do the

SD memory card format, then press " Enter Button " once will format the SD memory clear all the existing data that already saving into the SD card.

8. POWER SUPPLY from DC

ADAPTER

The meter also can supply the power supply from the

DC 9V Power Adapter ( optional ). Insert the plug of

Power Adapter into " DC 9V Power Adapter Input Socket "

( 3-13, Fig. 1 ). The meter will permanent power ON when use the DC ADAPTER power supply ( The power

Button function is disable ).

9. BATTERY REPLACEMENT

1)When the left corner of LCD display show " ", it is necessary to replace the battery. However, in-spec.

measurement may still be made for several hours after low battery indicator appears before the instrument become inaccurate.

19

2)Loose the " Battery Cover Screws " ( 3-15, Fig. 1 ) and take away the " Battery Cover " ( 3-17, Fig. 1 ) from the instrument and remove the battery.

3)Replace with DC 1.5 V battery ( UM3, AA,

Alkaline/heavy duty ) x 6 PCs, and reinstate the cover.

4)Make sure the battery cover is secured after changing the battery.

10. RS232 PC SERIAL INTERFACE

The instrument has RS232 PC serial interface via a 3.5

mm terminal ( 3-12, Fig. 1 ).

The data output is a 16 digit stream which can be utilized for user's specific application.

A RS232 lead with the following connection will be required to link the instrument with the PC serial port.

Meter PC

(9W 'D" Connector)

Center Pin..........................Pin 4

(3.5 mm jack plug)

Ground/shield.......................Pin 2

2.2 K resistor

Pin 5

The 16 digits data stream will be displayed in the following format :

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

20

Each digit indicates the following status :

D15

D14

Start Word

4

D13 When send the upper display data = 1

When send the lower display data = 2

D12, D11 Annunciator for Display dB = 17

D10

D9

D0

Polarity

0 = Positive 1 = Negative

Decimal Point(DP), position from right to the left

0 = No DP, 1= 1 DP, 2 = 2 DP, 3 = 3 DP

D8 to D1 Display reading, D1 = LSD, D8 = MSD

For example :

If the display reading is 1234, then D8 to

D1 is : 00001234

End Word

RS232 FORMAT : 9600, N, 8, 1

Baud rate

Parity

Data bit no.

Stop bit

9600

No parity

8 Data bits

1 Stop bit

11. CALIBRATION

1)Prepare the optional " SOUND CALIBRATOR ", such as

" SC-941 " or " SC-942 " ( set range to 94.0 dB ). Power on the Sound Calibrator & plug calibrator output socket into the " Microphone " head ( 3-9, Fig. 1 ) of the

Sound Level meter.

2)Select manual range to " 50 - 100 dB ".

3)Select " Time Weighting " at " Fast " position.

21

4)Select " A " weighting.

5)Adjust the " Calibration VR " ( 3-11, Fig. 1 ) carefully with a " - " screw driver until the display reading value within " 94 +/- 0.2 " dB.

12. FREQUENCY WEIGHTING

CHARACTERISTICS OF

A & C NETWORKS

Frequency A Weighting C Weighting Tolerance

Hz Charac.

Charac.

(IEC 61672 class 2)

31.5

63

-39.4 dB

-26.2 dB

-3 dB

-0.8 dB

± 3.5 dB

± 2.5 dB

125

250

500

1 K

2 K

-16.1 dB

-8.6 dB

-3.2 dB

0 dB

+1.2 dB

-0.2 dB

0 dB

0 dB

0 dB

-0.2 dB

± 2.0 dB

± 1.9 dB

± 1.9 dB

± 1.4 dB

± 2.6 dB

4 K

8 K

+1 dB

-1.1 dB

-0.8 dB

-3 dB

± 3.6 dB

± 5.6 dB

13. TIME WEIGHTING (FAST &

SLOW) CHARACTERISTICS

Time Weighting Max. response

Charac.

ref. continuous signal

Tolerance

(IEC 61672 class 2)

F ( Fast ) - 1.0 dB + 1 dB

- 2 dB

S ( Slow ) - 4.1 dB ± 2 dB

22

14. PATENT

The meter ( SD card structure ) already get patent or patent pending in following countries :

Germany Nr. 20 2008 016 337.4

JAPAN 3151214

TAIWAN M 358970

M 359043

CHINA ZL 2008 2 0189918.5

ZL 2008 2 0189917.0

USA Patent pending

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