Lutron Electronics EMF-831SD User manual

SD card real time datalogger, RS232/USB

RF EMF Strength Meter

Model : EMF-831SD

Your purchase of this

Personal RF EMF

Strength Meter

with SD CARD

DATALOGGER marks a

step forward for you

into the field of

precision measurement.

Although this METER is

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.

OPERATION MANUAL

TABLE OF CONTENTS

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

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

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

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

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

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

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

4-1 RF EMF Strength Function selection and measurement

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

4-2 Data Hold..........................................................

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

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

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

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

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

5-2 Auto Datalogger ( Set sampling time ≧ 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 Set mesurement value gain .................................................

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

7-8 Set the alarm value .................................................................................

..........

7-9 Select the alarm function yes or no .................................................

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

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

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

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

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

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

11. PATENT.................................................................................................................................................

1. FEATURES

* For electromagnetic field strength measurement including mobile

phone base station antenna radiation, RF power measurement for

transmitters, wireless LAN (Wi-Fi) detection/installation, wireless

communication applications (CW, TDMA, GSM, DECT) and

microwave leakage

* Measurement optimized for 900MHz, 1800MHz, 2.7GHz, and 3.5GHz

* Non-directional (isotropic) measurement with three-channel

(triaxial) measurement probe

* Microcomputer circuit provides intelligent function and high accuracy.

* 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 down load 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.

* 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.

2. SPECIFICATIONS

2-1 General Specifications

Circuit Custom one-chip of microprocessor LSI

circuit.

Display LCD size : 52 mm x 30 mm

Measurement Digital, triaxial measurement.

method

Sensor type Electrical-field sensors

resolution 0.1mV/m, 0.1uA/m, 0.1uW/m^2, 0.001uW/cm^2

Range autorange

Datalogger Auto 2 to 3600 seconds

Sampling Time

Setting range @ 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.

Data error no. ≦ 0.1 ％ no. of total saved data typically.

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

Advanced * Set clock time ( Year/Month/Date,

setting Hour/Minute/ Second )

* Set sampling time

* Auto power OFF management

* Set beep Sound ON/OFF

* Decimal point of SD card setting

* SD memory card Format

*Set temperature unit to ℃ or ℉

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.

Power off Auto shut off saves battery life or

manual off by push button.

Operating -20 ~ 50 ℃

Temperature

Operating Less than 85% R.H.

Humidity

Power Supply * Batteries( UM3, AA ) x 6 PCs, or equivalent.

* AC/DC power adapter .

(adapter is optional ).

Power Current Normal operation ( w/o SD card save data) :

Approx. DC 24 mA.

When SD card save the data :

Approx. DC 50 mA.

Weight 244 g/0.54 LB ( meter only ).

Dimension 177 x 68 x 45 mm

(7.0 x 2.7x 1.8 inch)

Accessories *

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

1 PCS

Included

Optional * SD Card ( 4 GB )

Accessories * USB cable, USB-01.

* RS232 cable, UPCB-02.

* Data Acquisition software,

* SW-U801-WIN., SW-E802.

AC to DC 9V adapter.

* Hard carrying case, CA-06.

* Soft carrying case, CA-05A.

2-2 Electrical Specifications (23±5

℃

, 25% ~ 75 % RH)

Frequency range: 900MHz, 1800MHz, 2.7GHz,

3.5GHz

Specified measurement range: 20 mV/m to 25.0 V/m

CW signal (f > 900MHz): 53 uA/m2 to 66.3mA/m

1 uW/m2 to 7.15W/m2

0 uW/cm2 to 0.715mW/cm2

Units mV/m, V/m, µA/m, mA/m, µW/m2,

mW/m2, W/m2, µW/cm2, mW/cm2

Display resolution: 0.1mV/m, 0.1uA/m, 0.1uW/m^2, 

0.001uW/cm^2 , 0.001W/cm2

Dynamic range Typically 75dB

Absolute error 1.0dB

at 1 V/m & 900 MHz

Frequency response 1.0dB (50MHz to 1.9GHz)

Sensor (with typical CAL factors) 2.4dB (1.9GHz to 3.5GHz)

Isotropy deviation Typically 1.0dB (f>900MHz)

Overload limit 1.32mW/cm2 (25V/m)

Thermal response (0 to 50°) 0.5dB

Above specification tests under the environment RF Field Strength

less than 3 V/M & frequency less than 30 MHz only.

3. FRONT PANEL DESCRIPTION

Fig. 1

3-1 Display. 3-15 Battery compartment/Cover

3-2 Power Button 3-16 Tripod Fix Nut

3-3 Hold Button 3-17 RF EMF detect seneor

3-4 REC Button

3-5 ▲ Button ( UNIT Button)

3-6 ▼ Button ( X,Y,Z,XYZ Function Button )

3-7 Time Button (SET Button )

3-8 Enter Button ( Logger Button)

3-9 SD card socket

3-10 RS-232 output terminal

3-11 Reset Button

3-12 DC 9V adapter socket

3-13 Stand

3-14 Battery Cover Screws

4. MEASURING PROCEDURE

E-field sensors

The 3-channel sensor is located at the top of the meter. The three voltages

generated by the sensor are fed back to the meter.

The measurement of the field is done by moving the aerial of the sensor in

the desired measured environment. A direct wide band

measurement is obtained of the field that the measurement sensor is

subjected to. To find the value of the field emitted by a source of interference,

simply point the aerial towards it and get as close as possible (the value of the

field is inversely proportional to the distance of the sensor/emission source).

The operator must take care not to be between the source of disturbance and

the zone to be checked. The human body shields electromagnetic fields.

4-1 RF EMF Strength Function selection and measurement

1) Turn on the meter by pressing the " Power Button "

( 3-2, Fig. 1 ) > 1.5 seconds continuously.

*Pressing the " Power Button " ( 3-2, Fig. 1 )

continuously and > 1.5 seconds again will turn off the

meter.

2) measurement Function select

pressing and hold the " Function Button "( 3-6, Fig. 1 ),

to select X axis,Y axis, Z axis, and XYZ axis measurement Function.

3) measurement UNIT select

pressing and hold the " UNIT Button "( 3-5, Fig. 1 ),

to select …

1mV/m, When Test values > 999.9 ,the unit auto chang to V/m unit ,

2µA/m, When Test values > 999.9 ,the unit auto chang to mA/m unit ,

3µW/m^2, When Test values > 999.9 ,the unit auto chang to mW/m^2 unit ,

mW/m^2, When Test values > 999.9 ,the unit auto chang to W/m^2 unit ,

4µW/cm^2, When Test values > 999.9 ,the unit auto chang to mW/cm^2 unit ,

4) measurement Procedure

1. Hold the meter at arm’s length.

2. Make several measurements at various locations around the work place

or the interested areas as described above. This is particularly important

if the field conditions are unknown.

3. Pay special attention to measuring the neighboring vicinity for possible

radiation sources. Apart from active sources, those components connected

to a source may also act as radiators. For example, the cables used in

diathermy equipment may also radiate electromagnetic energy. Note

that metallic objects within the field may locally concentrate or amplify the

field from a distant source.

4-2 Data Hold

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

Fig. 1 ) once will hold the measured value & the " HOLD " symbole

will be light, Press the " Hold Button " once again will release the data

hold function , ( 3-20, Fig. 1) HOLD symbole will be quenched

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 indicator "

will be light.

2) With the " REC " Symbol is light on the display :

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

REC and MAX Symbol indicator will be light ,

and the maximum value will appear on the display.

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

" REC and MIN " Symbol indicator will be light ,

and the minimum value will appear on the display.

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

" REC " button for 1.5 seconds at least. The display will

revert to the current reading, red led indicator will be quenched

5. DATALOGGER

5-1 Preparation before execute datalogger function

a. Insert the SD card

Prepare a " SD memory card " ( 1 G to 16 G, optional ),

insert the SD card into the " SD card socket " ( 3-9, Fig. 1).

The front panel of the SD card should face against the

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 16 ) .

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. Time setting

If the meter is used at first time, it should to adjust the

clock time exactly, please refer chapter 7-1 ( page 14 ).

d. Decimal for 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 16.

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