PCE Instruments PCE-NDL 10 Users guide

PCE Americas Inc.
711 Commerce Way
Suite 8
Jupiter
FL-33458
USA
From outside US: +1
Tel: [phone]
Fax: [phone]
[e-mail]

Sound Level Meter

PCE-NDL 10

Your purchase of this
Personal sound exposure

Noise Dosimeter

with SD CARD
DATALOGGER marks a
step forward for you
into the field of
precision measurement.
Although thi
a complex and delicate
instrument, its durable
structure will allow
many years of use if
proper operating
techniques are
developed. Please read
the following
instructions carefully
and always keep this
manual within easy
reach.

PCE Instruments UK Ltd.

Southpoint Business Park

Hampshire / Southampton

United Kingdom, SO31 4RF

From outside UK: +44

Tel: [phone]

Fax: [phone]

[e-mail]

www.pce-instruments.com/english

www.pce-instruments.com

s METER is

Units 12/13

Ensign way

OPERATION MANUAL

SD card real time datalogger, RS232/USB
Frequency weighting and Time weighting
meet IEC 61672 class 2 ,

Personal sound exposure meet IEC 61252

TABLE OF CONTENTS

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

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

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

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

4-1 Sound Pressure Level

Measurements (SPL).................................

4-2 Running the Dose Meter Noise Survey (DOSE %)…………………..

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

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

4-5 LCD Backlight ON/OFF…………………………………………………………………

5. DATALOGGER...................................................................................................................

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

1 second )........................................................

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

5-4 Check time and sampling time information................................................................................................................

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

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

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

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

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

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

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

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

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

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

DC ADAPTER........................................................................

9. SYSTEM RESET...........................................................................................

10. BATTERY REPLACEMENT...............................................................................................

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

12. FREQUENCY WEIGHTING CHARACTERISTICS

CALIBRATION ..............................................................................................................

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

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

5-2 Auto Datalogger ( Set sampling time

≧

8. POWER SUPPLY FROM

11. RS232 PC SERIAL INTERFACE

13. FREQUENCY WEIGHTING CHARACTERISTICS

14. TIME WEIGHTING (FAST & SLOW)

1
2
6
7
7
8
9
9
10
11
11
11
13
14
14
15
17
17
18
18
19
19
20
20
21
21
22
22
24

24

25

1. FEATURES

* Personal sound exposure meet IEC 61252
* Frequency and Time weighting are designed to meet IEC 61672 class 2.
* A & C weighting networks comply with standards.
* LCD is dot-matrix with backlight and easy reading.
* Combination Dose meter, Data-logger and Sound level meter.
* 0.5" standard microphone head.
* Time weighting (Fast & Slow) dynamic characteristic modes.
* Build External calibration VR.
* User-defined measurement configurations. Selectable Criterion Level,

* Exchange Rate, Threshold, Frequency Weighting, and Response Time setting.

* Condenser microphone for high accuracy & long-term stability.
* Memory function to store the Max. & Min. value.
* Hold functions.
* Real time Datalogger

Records device of internal memory device (EEPROM) and an external

memory device (SD memory card ) ,Real time 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 ).
* 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.
* Can default auto power off or manual power off.
* Noise Dose %，SPL measurements.
* Microcomputer circuit, high accuracy.
* Power by UM4/AAA ( 1.5 V ) x 6 batteries or DC 9V adapter.
* RS232/USB PC COMPUTER interface.
* Heavy duty & compact housing case.

1

2. SPECIFICATIONS

Circuit Custom one-chip of microprocessor LSI

circuit.

Display LCD size : 50 mm x 30 mm

LCD with green backlight ( ON/OFF ).
Measurement SPL : Sound pressure level
Type Dose

：：：：

test noise exprosure
Measurement SPL：Auto 30 - 130 dB.
Range Dose：70～130dB
Resolution 0.1 dB.

Function dB ( A & C frequency weighting ),

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

Accuracy Characteristics of " A " frequency weighting

℃

(23 ±5

) network meet IEC 61672 class 2.

Under 94 dB input signal, the accuracy
are :

31.5 Hz ±3.0 dB
63 Hz ±2.0 dB
125 Hz ±1.5 dB
250 Hz ±1.5 dB
500 Hz ±1.5 dB
1 K Hz ±1.0 dB
2 K Hz ±2.0 dB
4 K Hz ±3.0 dB
8 K Hz ±5.0 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.
Function selector

SPL Auto range

：30～

130dB.

DOSE Threshold Level(Thr)：70～90dB in 1dB steps.

Criterion Level(Crit)：80、84、85、90dB.

Exchange Rate

：

3, 4, 5 or 6 dB
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.

Memory device internal memory device :

EEPROM can be record 16,000 items.

ternal memory device ( AC Adapter only ) :

ex

SD memory card. 1 GB to 16 GB.
Data error no.

≦

0.1% no. of total saved data typically.

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.

4

Power off Auto shut off saves battery life or

* AC/DC power adapter is optional.

* AC/DC power adapter is optional.

* AC/DC power adapter is optional.

*

Instruction manual.........................................

*

Soft carrying case, CA-05A…………………………....

*

Micophone with clip…………………………....

Hanging unit ( with sticker ).............................

*

*

*

*

*

*

*

*

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 battery
( UM4, AAA ) x 6 PCs, or equivalent.
DC 9V adapter input. ( AC/DC power
adapter is optional ).

Power Current Normal operation ( w/o SD card save

data and LCD Backlight is OFF) :

Approx. DC 16 mA.

When " SD " save the data but and

LCD Backlight is OFF) :

Approx. DC 35 mA.
If LCD backlight on, the power
consumption will increase approx.
DC 8 mA.

Weight 250 g/ 0.55 LB. (without battery)
Dimension 132 x 80 x 32 mm.

( 5.2 x 3.1 x 1.3 inch ).
Accessories
Included

*

Optional
Accessories

Sound calibrator ( 94 dB ), SC-941.
Sound calibrator ( 94/114 dB ), SC-942.
Sound wind shield ball, SB-01
SD Card ( 4 GB )
USB cable, USB-01.
RS232 cable, UPCB-02.
Data Acquisition software,
SW-E2005.
AC to DC 9V adapter.

1 PC
1 PC
1 PC
1 PC

5

3. FRONT PANEL DESCRIPTION

Fig. 1

3-1 Display. 3-11 Microphone input jack
3-2 Power Button( Backlight Button ) 3-12 External 94dB CAL. VR
3-3 ▲ Button ( Hold only for SPL
3-4 RUN Button ( REC only for SPL) 3-14 RS232 Output
3-5 TIME Button (Set) 3-15 SD card socket
3-6 ▼ Button 3-16 Hanging holes
3-7 ENTER Button (Fast / Slow) 3-17 Stand
3-8 Microphone 3-18 Battery compartment and
3-9 Microphone plug
3-10 DC 9V adapter socket. 3-19 Hanging unit ( with sticker)

)

6

3-13 Reset Switch.

Screw of the battery cover

4. MEASURING PROCEDURE

4-1 Sound Pressure Measurements (SPL)

b. The characteristic of A weighting is simulated as

the " Human Ear Listening " response.

Typically always select the A weighting module 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

In SPL mode the display shows readings of

the sound pressure level.

1) Power ON the meter by pressing and holding the " Power
Button " ( 3-2, Fig. 1 )for at least 1.5 seconds,
the meter's default function is " A"( frequency weighting) ,
" Fast"( time weighting) " Auto range ". The
LCD display will show the Symbol " A, FAST , xx.x dB , 0 ".

2) Frequency weighting select
How to select the frequency weighting ( A or C), the
procedures please refer to chapter 7-7 page 20 .

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

ref. page 24.

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) According to various measuring sound source, select the
Time Weighting ( Fast or Slow ) by pressing " ENTER
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 ".

7

4-2 Running the Dose Meter Noise Survey

1) In " SPL" mode to select the " Dose " mode by
pressing and holding the" RUN button" ( 3-4 Fig 1 )
into the DOSE mode .

2) In "DOSE" mode, display will show DUR(duration) ,

0.00(cumulative dose) , 00 : 00 :00(current time) ,
0(record sampling time counter) , %DOSE(Dose mode) ,
FAST(Time weighting).

3) In Dose mode , Pressing and holding the " Time Button "
into setting , SET" DATE→SP-T→POFF→BEEP→DEC

→

SD-F→A→Crit→Thr→ER→CLRM→DATE".

Note :

a:Crit(Criterion Level) : 80

、84、85、

90dB.
b:Thr(Threshold Level) : 70 to 90dB in 1 dB steps.
c:ER(Exchange Rate) : 3, 4, 5, or 6 db.
d:pressing the " Power Button" to leave the set mode.
e:Factory default settings : Crit→90 , Thr→70 , ER→3.

4) According to various measuring sound source, select the
Time Weighting ( Fast or Slow ) by pressing the "ENTER
Button " ( 3-7, Fig. 1 ).

5) In DOSE mode , pressing and holding the ▼ button ,
display is shown and DUR , xx : xx : xx(h : m : s) ,
pressing the ▲ or ▼ button adjustment measurement
time, pressing Enter button to save the satting and leave setting .

24 Hr 12 Hr 10 Hr 8 Hr 4 Hr
2 Hr 1 Hr 30 minutes 15 minutes 10 minutes
5 minutes 1 minutes

6) In DOSE mode ,Setting current date or current time surely.

(please refer to chapter 7-1 page 17)

8

pressing and holding the ▲ button , display is shown
and the BEG , x.xx , xx - xx : xx(date - hr : min) and then
pressing and holding the ▼ button , display is shown
and the BEG , xx - xx : xx(dd - h : m) and END
xx - xx : xx(dd - h : m) , pressing ▲ or ▼ button to set
the BEG(begin time) , pressing TIME button to setting next vaule
, pressing ENTER button to save the setting and leave the
setting , pressing ▲ button once to check the set state.
If user wants to record %dose every day.Please use the ▼ button
to select R BEG , then press RUN button,
If user wants to rerun %dose Function .Please use the ▲ button
and ▼ button > 2 sec. to reset dose value and time.
If user wants to change RUN or Pause Function.Please press the

▼

button and Enter button to release KEY LOCK.

4-3 Data Hold

During the SPL measurement, press the " ▲ 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 leave the data
hold function.

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

1) The data record function records the maximum and
minimum readings. Press the " RUN Button " ( 3-4, Fig.1 )
once to start the Data Record function and display
is shown the" REC " symbol .

9

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

" REC MAX " symbol along with the maximum value
will appear on the display. Press the " RUN Button"
again the " REC MIN " symbol along with the minimum
value will appear on the display. Press the " RUN Button"
again will show the " REC " symbol only & execute the
memory function continuously.

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

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

4-5 LCD Backlight ON/OFF

After power ON, the " LCD Backlight " will light
automatically. During the measurement, press the
" POWER Button " ( 3-2, Fig. 1 ) once will turn off the
" LCD Backlight ".
Press the " POWER Button " once again will turn ON the
" LCD Backlight " again.

10

5. DATALOGGER

5-1 Preparation before execute datalogger function

The dose meter measured data first be stored into the meter internal
built EEPROM, can be stored total of 16,000 sets of data, when stored
> 16000 sets , datalogger will be stop and display will show FULL.

Remark :

How to send the storage of information, you have two choices.

1) If select data send to SD card , please use AC adapter . refer to
Chapter 5-2 d.--a,b,c. page 12,13.

2) If select the logger data send to RS232 , please press the
power button > 2 sec. refer to Chapter 5-2 d.---c. page 13.

a. Time setting
If the meter is used at first time, it should to adjust the
clock time exactly, please refer chapter 7-1 ( page 17 ).
b. 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
7-5, page 19.

5-2 Auto Datalogger ( Set sampling time

a. Start the datalogger

Pressing and holding the " ENTER Button "( 3-7, Fig. 1 ) once ,
display is shown " LOGGER " , the " LOGGER " will flashing
at the same time the measuring data along the time information
will be saved into the memory circuit(EEPROM).
and the top right will record items.

11

≧≧≧≧

1 second )

Remark :
How to set the sampling time, refer to Chapter 7-2, page 18.
In Dose mode please start datalogger , then run Dose Function.

b. Pause the datalogger

During execute the Datalogger function , if press the
" ENTER Button " ( 3-7, Fig. 1 ) once will pause the
Datalogger function ( stop to save the measuring data
into the memory circuit temporality ). In the same time
the text of " LOGGER " will stop flashing.

Remark :
If press the " ENTER Button " ( 3-7, Fig. 1 ) once again
will execute the Datalogger again, the text of " LOGGER " will
flashing .

c. Finish the Datalogger

Press the " ENTER Button "( 3-7, Fig. 1) continuously at
least two seconds, the " LOGGER " 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 maybe disable.

d. EEPROM Datalogger data send to SD card or RS232.

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 " ( 3-15, Fig. 1).
The front panel of the SD card should face against the
down case.

≦

* It recommend use memory card

4 GB.

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 20 ).
* It recommend strongly, do not use memory cards that

have been formatted by other meter or by other installation ( such
as camera…) Reformat the memory card with your meter.

* If the sd memory card exist the trouble during

format by the meter , use the Computer to
reformat again can fix the problem .

c. EEPROM data send to SD card or RS232 select
EEPROM data send to SD card or RS232 select , press "▲ + RUN "
Button continuously at least two seconds , the " SEND TO SD and
RS232 " text will be appeared , use "▲ or ▼ "Button to select SD or
RS232 , then press " ENTER " , then press " RUN " to send the data,
display will show the send data counts.

Remark :

If select data send to SD card , please use AC adapter .
If want to pause send the logger data , please press the run button
ones, press the run button ones again will be resume the send
logger data.
If stop send the logger data , please press the power button > 2 sec.

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

a. Set sampling time is to 0 second

Pressing and holding the " ENTER Button ( 3-7, Fig. 1 ) once ,
the LCD will show the text " LOGGER ", then press the
" ENTER Button "( 3-7, Fig. 1 ) once, the " LOGGER " will flashing
at the same time the measuring data along the time information will
be saved into the memory circuit.

b. Finish the Datalogger

Press the " Enter Button " ( 3-7, Fig. 1) continuously at least two
seconds, the " LOGGER " indication will be
disappeared and finish the Datalogger.

13

5-4 Check time and sampling time information

1)

2)

3)

4)

During the measurement if press " TIME Button "
( 3-5, Fig. 1 ) ones, the LCD display will
present the time and sampling time information of Year/Month/
Date , Hour/ Minute/Second, and sampling time informationin
in second unit.

5-5 SD Card Data structure

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

SLD01

If the first time to execute the Datalogger,
under the route SLD01\, will generate a new
file name SLD01001.XLS.
After exist the Datalogger, then execute again,
the data will save to the SLD01001.XLS until
Data column reach to 30,000 columns, then
will generate a new file, for example SLD01002.XLS
Under the folder SLD01\, if the total files more
than 99 files, will generate anew route, such as

SLD02\ ........

The file's route structure :
SLD01\

SLD01001.XLS
SLD01002.XLS

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

SLD01099.XLS

SLD02\

SLD02001.XLS
SLD02002.XLS

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

SLD02099.XLS

SLDXX\

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

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

Remark : XX : Max. value is 10.

14

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 " ( 3-15, 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 : SLD01001.XLS, SLD01002.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 )

15

EXCEL graphic screen ( for example )

16

7. ADVANCED SETTING

Under do not execute the Datalogger function,

Crit ….….

ER …..…..

press the " TIME Button " ( 3-5, Fig. 1 ) continuously at
least 1.5 seconds will enter the " Advanced Setting " mode.
then press the "TIME Button " (3-5, Fig. 1 ) once a while
in sequence to select the eleven main function, the lower
display will show :

DATE…… Set clock time ( Year/Month/Date, Hour/Minute/

Second )

SP-T......... Set sampling time ( 0-3600 Seconds )

POFF....... Auto power OFF management

BEEP....... Set beeper sound ON/OFF

DEC......... Set SD card Decimal character

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

A ……… Select the Frequency weighting to A or C

Set Criterion level in dB

Thr …….. Set Threshold in dB

Set Exchange rate in dB

CLRM …….. Set Clear Memory

During execute the " Advanced Setting " function,
if press " Enter Button " ( 3-7, Fig. 1 ) will into main function.
if press " POWER 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) Use the " ▲ Button " ( 3-3, 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 " ( 3-7, 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 ).

17

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

Minute, Second ),
the screen will jump to " Set sampling time 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 ).

7-2 Set sampling time ( seconds )

When the lower display show " SP-T "

▲

1) Use the "

Button " ( 3-3, Fig. 1 ) or " ▼ Button " (

3-6, Fig. 1 ) to adjust the value ( 0 ~ 3600 sec.)

if press " RUN button " the adjust value will be x 10 increase.

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 " ( 3-7, 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 " ( 3-3, Fig. 1 ) or " ▼ Button "

( 3-6, Fig. 1 ) to select the upper text 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 " ( 3-7, Fig. 1 ) will save the setting
function with default.

18

7-4 Set beeper sound ON/OFF

When the lower display show " BEEP "

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

( 3-6, Fig. 1 ) to select the upper text 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 " ( 3-7, 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 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 "

▲

1) Use the "

Button " ( 3-3, Fig. 1 ) or " ▼ Button "
( 3-6, Fig. 1 ) to select the upper text to " USA " or
" EURO ".

USA - Use " . " as the Decimal point with default.
EURO - Use " , " as the Decimal point with default.

19

2) After select the upper text to " USA " or " EURO ",
press the " ENTER Button " ( 3-7, Fig. 1 ) will save the
setting function with default.

7-6 SD memory card Format

When the lower display show " SD-F "

1) Use the " ▲ Button " ( 3-3, Fig. 1 ) or " ▼ Button " (
3-6, Fig. 1 ) to select the upper text 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
" ( 3-7, Fig. 1 ) once again, the Display will show text
" YES ENTER " 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.

7-7 Frequency weighting to A or C setting

When the display show " A "

1) Pressing and hold the " TIME Button " ( 3-5, Fig. 1 ) ,
into Advanced setting , to set A or C weighting,

▲

push

or ▼ select the "A " or " C ".And then push
" ENTER Button " set completely. Pushing the " POWER
Button " to relieve the Advanced setting.

A - A Frequency weighting selection.
C - C Frequency weighting selection.

20

8. POWER SUPPLY from DC ADAPTER

9. SYSTEM RESET

Note :

a. The characteristic table of A, C weighting, please

ref. page 24.

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.

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 "
( 3-10, Fig. 1 ). The meter will permanent power ON
when use the DC ADAPTER power supply ( The power
Button function is disable ).

If the meter happen the troubles such as :

CPU system is hold ( for example, the key button can
not be operated... ).

Then make the system RESET will fix the problem.
The system RESET procedures will be either following
method :

During the power on, use a pin to press the " Reset
Button " ( 3-13, Fig. 1 ) once a while will reset the
circuit system.

21

10. BATTERY REPLACEMENT

11. RS232 PC SERIAL INTERFACE

Center Pin............................................

Ground/shield...........................................

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.

2) Loose the " Battery Cover Screws " ( 3-18, Fig. 1 )
and take away the " Battery Cover " ( 3-18, Fig. 1 )
from the instrument and remove the battery.

3) Replace with DC 1.5 V battery ( UM4, AAA,
Alkaline/heavy duty ) x 6 PCs, and reinstate the cover.

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

The instrument has RS232 PC serial interface via a 3.5
mm terminal ( 3-14, Fig. 1 ).
The data output is a 16 digit stream which can be
utilized for user's specific application.

Remark:

* When power use AC to DC adapter, the RS-232 signal will output

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

Meter PC

(9W 'D" Connector)

Pin 4

(3.5 mm jack plug)

Pin 2

Pin 5

2.2 K
resistor

22

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

Each digit indicates the following status :

D15 Start Word
D14 4
D13 When send the SPL display data = 1

When send the DOSE display data = 2

D12, D11 Annunciator for Display

dB = 17 % = 03

D10 Polarity

0 = Positive 1 = Negative

D9 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

D0 End Word

RS232 FORMAT : 9600, N, 8, 1

Baud rate 9600
Parity No parity
Data bit no. 8 Data bits
Stop bit 1 Stop bit

23

12. CALIBRATION

13. FREQUENCY WEIGHTING

CHARACTERISTICS OF A & C

NETWORKS

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 ( 3-8, Fig. 1 ) of the
Sound Level meter.

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

3) Select " A " weighting.

4) Adjust the " Calibration VR " ( 3-12, Fig. 1 ) carefully
with a " - " screw driver until the display reading value
within " 94 +/- 0.2 " dB.

Frequency A Weighting C Weighting Tolerance

Charac. Charac. ( IEC 61672

Class 2 )

31.5 Hz -39.4 dB -3 dB ±3.0 dB
63 Hz -26.2 dB -0.8 dB ±2.0 dB
125 Hz -16.1 dB -0.2 dB ±1.5 dB
250 Hz -8.6 dB 0 dB ±1.5 dB
500 Hz -3.2 dB 0 dB ±1.5 dB
1 KHz 0 dB 0 dB ±1.0 dB
2 KHz +1.2 dB -0.2 dB ±2.0 dB
4 KHz +1 dB -0.8 dB ±3.0 dB
8 KHz -1.1 dB -3 dB ±5.0 dB

24

14. TIME WEIGHTING ( F/S )

CHARACTERISTICS

` Max. response Tolerance
Charac. ref. continuous ( IEC 61672 Class 2 )

signal
F ( Fast ) - 1.0 dB + 1.0 dB , - 2.0 dB
S ( Slow ) - 4.1 dB ±2.0 dB

* Test under signal on 1,000 Hz/94 dB.