Certificate of Calibration

Transcription

1 Certificate of Caibration We hereby certify that this product has been caibrated and found to be in accordance with the appicabe SPECIFICATIONS and STANDARDS. Accuracies of the standard equipment used in this caibration are traceabe to the Nationa Standards. MECO METERS PVT. LTD. Pot No. EL-60, MIDC Eectronic Zone, TTC Industria Area, Mahape, Navi Mumbai (INDIA) Te : , (Board) Fax : , E-mai : saes@mecoinst.com Web : SR. NO. : CHECKED BY : DATE : MODEL NO. : ELECTROSMOG METER MODEL : 9720 USER MANUAL Contents 1. Safety Information Introduction Fundamentas 2.2 Appication 2.3 Features 3. Specifications Genera Specifications 3.2 Eectrica Specifications 4. Operations Front pane contro description 4.2 LCD dispay description 4.3 Use E-fied sensor 4.4 Expanatory notes 4.5 Setting the meter 4.6 Making measurements 4.7 Manua data memory storeing individua measured vaues 5. Measurement preparation 5.1 Battery oading 5.2 Battery repacement 2 SAFETY INFORMATION CAUTION Before making a measurement, check if the ow battery symbo ( ) is shown on the dispay as soon as the meter is switched on. Change the battery if the symbo is dispayed. In the case of proonged storage, it is preferabe to remove the battery from the meter. Avoid shaking the meter, particuary in the measurement mode. The accuracy and function of the meter may be adversey affected by the specified imits outside and improper handing. DANGER In some cases, work in the vicinity of powerfu radiation sources can be a risk of your ife. Be aware that persons with eectronic impants(e.g. cardiac pacemakers) are subject to particuar dangers in some cases, Observe the oca safety reguations of the faciity operation. Observe the operating instructions for equipment which is used to generate, conduct or consumer eectromagnetic energy. Be aware that secondary radiators (e.g. refective objects such as a metaic fence) can cause a oca ampification of the fied. Be aware that the fied strength in the near vicinity of radiators increases proportionay to the inverse cube of the distance. This means that enormous fied strengths can resut in the immediate vicinity of sma radiation sources (e.g. eak in waveguides, inductive ovens). Fied strength measuring device can underrate pused 3

2 signas. Particuary with radar signas, significant measurement errors can arise. A fied strength measuring devices have a imited specified frequency range. Fieds with spectra components outside of this frequency range are generay incorrecty evauated and tend to be underrated. Before using fied strength measuring devices, you shoud thus be certain that a fied components to be measured ie in the specified frequency range of the measuring device. 2. INTRODUCTION 2-1 Fundamentas Eectromagnetic poution : This Meter used to indicate eectromagnetic poution generated artificiay. Wherever there is a votage or a current, the eectric (E) and magnetic (H) fieds arise. A types of radio broadcasting and TV transmitters produce eectromagnetic fieds, and they aso arise in industry, business and the home, where they affect us even if our sense organs perceive nothing. Eectric fied strength (E) : A fied vector quantity that represents the force (F) on an infinitesima unit positive test charge (q) at a point divided by that charge. Eectric fied strength is expressed in units of vots per meter (V/m). Use the units of eectric fied strength for measurements in the foowing situations : In the near-fied area of the source. Where the nature of the eectromagnetic fied is unknown. Magnetic fied strength (H) : A fied vector that is equa to the magnetic fux density divided by the permeabiity of the medium, Magnetic fied strength is expressed in units of amperes per meter (A/m). The meter uses of magnetic fied strength for measurements ony in the far-fied area of the source. Power density (S) : Power per unit area norma to the direction of propagation, usuay expressed in units of watts per square meter W/m 2 ) or, for convenience, units such as miiwatts per square centimeter (mw/cm 2 ). 4 5 The characteristic of eectromagnetic fieds Eectromagnetic fieds propagate as waves and trave at the speed of ight (c). The waveength is proportiona to the frequency. c (speed of ight) (waveength) = f (frequency) If the distance to the fied source is ess than three waveength, then we are usuay in the near-fied. If the distance is more than three wave ength, the far-fied conditions usuay hod. In the near-fied, the ratio of eectric fied strength (E) and magnetic fied strength (H) is not constant, so we have to measure each separatey. In the far-fied, however, It is enough to just measure one fied quantity, then the other coud be computed accordingy. 2-2 Appication Quite often routine operation, maintenance and service work has to be done in areas where active eectromagnetic fieds are present, e.g. in broadcasting stations, etc. Additionay, other empoyees may be exposed to eectromagnetic radiation. In such cases, it is essentia that personne are not exposed to dangerous eves of eectromagnetic radiation, such as : High frequency (RF) eectromagnetic wave fied strength measurement. Mobi phone base station antenna radiation power density measurement. Wireess communication appications (CW, TDMA, GSM, DECT). RF power measurement for transmitters. Wireess LAN (Wi-F) detection, instaation. Spy camera, wireess bug finder. Ceuar/Cordess phone radiation safety eve. Microwave oven eakage detection. Persona iving environment EMF safety. 2.3 Features The meter is a broadband device for monitoring highfrequency radiation in the range from 50MHz to 3.5GHz. The non-directiona eectric fied and high sensitivity aso aow measurements of eectric fied strength in TEM ces and absorber rooms. The unit of measurement and the measurement types have been seected to expressed in units of eectrica and magnetic fied strength and power density. At high frequencies, the power density is of particuar significance. It provides a measure of the power absorbed by a person exposed to the fied. This power eve must be kept as ow as possibe at high frequencies. The meter can be set to dispay the instantaneous vaue, the maximum vaue measured or the average vaue. Instantaneous and maximum vaue measurements are usefu for orientation, e.g. when first entering an exposed area. 50MHz to 3.5GHz Frequency range. For isotropic measurements of eectromagnetic fieds. Non-directiona (isotropic) measurement with threechanne measurement sensor. High dynamic range due to three-channe digita resuts processing. Configurabe aarm threshod and memory function. Easy & safety to use. 6 7

3 3. SPECIFICATIONS 3-1 Genera Specifications Measurement method : Digita, triaxia measurement. Directiona characteristic : Isotropic, triaxia. Measurement range seection : One continuous range. Dispay resoution : 0.1mV/m, 0.1mA/m, 0.1mW/m 2, 0.001m W/cm 2 Setting time : Typicay 1s (0 to 90% of measurement vaue). Dispay refresh rate : Typicay 0.5 seconds Dispay type : Liquid-crysta (LCD), 4 digit. Audibe aarm : Buzzer, Units : mv/m, V/m, ma/m, ma/m, mw/m 2, mw/m 2, W/m 2, mw/cm 2, mw/cm 2 Dispay vaue : Instantaneous measured vaue, maximum vaue, or maximum average vaue. Aarm function : Adjustabe threshod with ON/OFF. Caibration factor CAL : Adjustabe. Manua data memory and read storage : 99 data sets. Dry batteries : 9V NEDA 1604/1604A Battery ife : > 15 hours Auto power off : 15 minutes Operating temperature range : 0 C to +50 C Operating humidity range : 25% to 75%RH Storage temperature range : -10 C to +60 C Storage humidity range : 0% to 80%RH Dimensions : 60 x 60 x 237 mm (approx.) Weight : 200gms incuding battery (approx.) 3-2 Eectrica Scecifications Accessories : Instruction manua x 1, 9V battery (instaed) x 1, carrying case x Uness otherwise stated, the foowing specifications hod under the foowing conditions : The meter is ocated in the far-fied of a source, the sensor head is pointed towards the source. Ambient temperature : C±3 0 C Reative air humidity : 25% to 75% Sensor type : Eectrica fied (E) Frequency range : 50MHz to 3.5GHz Specified measurement range : CW signa (f> 50MHz) : 20mV/m to 108.0V/m, 53mA/m to 286.4mA/m, 1mW/m 2 to 30.93W/m 2 Dynamic range : Typicay 75dB 0mW/cm 2 to 3.093mW/cm 2 Absoute error at 1 V/m and 50 MHz : ±1.0dB Frequency response : Sensor taking into account the typica CAL factor : ±1.0dB (50MHz to 1.9GHz) ±2.4dB (1.9GHz to 3.5GHz) Isotropy deviation : Typicay ±1.0dB (f>5omhz) Overoad imit : 10.61mW/cm2 (200V/m) Therma response (0 to 50 C) : ±0.2dB 4 OPERATION (4) ALARM MODE key : 4-1 Front pane contros description 1. Press this key to change sensor axis seector: A axis X axis Y axis Z axis. 2. Press and hod this key whie turning the meter on to switch the device to the aarm setting mode Press this key for 2 seconds to switch the aarm function on or off. (5) Unit key : 1. Press this key to change units seector : mv/m or V/m ma/m or ma/m mw/m 2, mw/m 2 or W/m 2 mw/cm 2 or mw/cm 2 2. Press this key for 2 seconds to turn the backight on. 2 The backight turns off automaticay in 15 seconds ater. 3. Press and hod this key and turn on the meter again to 3 5 disabe the backight auto off function. 4 (6) key : Press this key to turn the meter on or off. 6 (7) MEM key : 1. Press this key momentariy to store one data set to 7 8 memory. 2. Press and hod this key whie turning the meter on to (1) E-fied sensor. enter the cear manuay recorded data mode. 3. In the manua data reading mode, press this key to (2) LCD dispay. read the next stored data. (3) MAX-AVG Keys : 4. In the aarm setting mode, press this key to increase 1. Press this key to change sequentia Instantaneous the setting vaue. Max. instantaneous Average Max. (8) READ key : average. 1. Press this key to switch to the manua data reading 2. In the read mode, press this key to exit. mode. 2. Press and hod this key whie turning the meter on to 3. In the aarm setting mode, press this key to store the disabe the auto power off function. setting vaue. 3. In the manua data reading mode, press this key to 4. Press and hod this key whie turning the meter on to read the previous stored data. disabe the audibe sound. Then the symbo wi 4. In the aarm setting mode, press this key to decrease 10 disappear. the setting vaue. 11

4 4-2 LCD dispay description (1) Auto power off function on / off. (2) Dispayed : Audibe sound function on / off. (3) MAX : Maximum measured vaue dispayed. MAX AVG : Maximum average vaue dispayed. (4) AVG : Average measured vaue dispayed. (11) ALM : Aarm function on /off or aarm setting indication. (12) : When the aarm function is on the instantaneous measured vaue exceeds the imit vaue indication. (13) : Anaog bargraph of each axis (X,Y or Z) measured dynamic range indication for observing trends. (14) X : X axis measured vaue dispayed. (15) Y : Y axis measured vaue dispayed. (16) Z : Z axis measured vaue dispayed. 4-3 Use E-fied sensor The actua 3-channe sensor is ocated in the head part of the meter. The three votages generated by the sensor are fed back to the meter. In far-fieds, an E-fied sensor is preferabe due to the greater bandwidth. The E-fied sensor for frequencies is from 50MHz to 3.5GHz. The meter is a sma portabe instrument that measures the eectric fied presented in the atmosphere of the measurement sensor surroundings. The measurement of the fied is done by moving the aeria Of the sensor in the desired measured environment. (5) : Low battery indication. (6) Units : mv/m and V/m : Eectric fied strength. You obtain a direct wide band measurement of the fied that μa/m and ma/m : Magnetic fied strength. the measurement sensor is subjected to. To find the vaue μw/m 2, mw/m 2, W/m 2, μw/cm 2 and mw/cm 2 : Power of the fied emitted by a source of interference, simpy point density the aeria towards it and get as cose as possibe (the vaue (7) : Measured vaue dispayed as per seected of the fied is inversey proportiona to the distance of the mode and seected units. sensor/emission source). The operator must take care not to be between the source of disturbance and the zone (8) : Manua data memory mode indication. to be checked : the human body shieds eectromagnetic (9) : Manua data memory address number (1 ~ 99) : The manua data memory cear mode. fieds. The E-fied sensor is isotropic, it does not require specia handing. Its sensitive part measures the fied according to 3 axes without the aeria having to be moved in the 3 panes. Simpy point it at the target to make the (10) : Stored measured vaue to memory indication. measurement Expanatory notes Units of measurement The meter measures the eectrica component of the fied, the defaut units are those of eectrica fied strength (mv/m, V/m). The meter converts the measurement vaues to the other units of measurement, i.e. the corresponding magnetic fied strength units (μa/m, ma/m) and power density units (μw/m 2, mw/m 2, W/m 2, μw/cm 2 and mw/cm 2 ) using the standard far-fied formuate for eectromagnetic radiation. The conversion is invaid for near-fied measurements, as there is no generay vaid reationship between eectrica and magnetic fied strength in this situation. Aways use the defaut units of the sensor when making near-fied measurements Resut modes The bar graph dispay aways shows each axis (X, Y or Z) the instantaneous measured dynamic range vaue. The digit dispay shows the instantaneous or resut according to one of four modes which can be seected Instantaneous : The dispay shows the ast vaue measured by the sensor, no symbo is dispayed. Maximum instantaneous (MAX) : The digita dispay shows the highest instantaneous vaue measured, the MAX symbo is dispayed. Average (AVG) : The digita dispay shows the average vaue measured, the AVG symbo is dispayed. Maximum average (MAX AVG) : The digita dispay shows the highest average vaue measured, the MAX AVG symbo is dispayed. Fied strength Caibration factor (CAL) The caibration factor CAL serves to caibrate the resut dispay. The fied strength vaue measured internay is mutipied by the vaue of CAL that has been entered and the resuting vaue is dispayed. The CAL setting range is from 0.20 to The CAL factor is often used as a means of entering the sensitivity of the fied sensor in terms of its frequency response in order to improve measurement accuracy. Frequency-dependent sensor caibration factors are provided for this appication, In many cases, the measurement accuracy wi be sufficient even if the frequency response of sensor caibration factor is ignored. CAL can be set to 1.00 in such cases

5 E-Fied typicay caibration data : Frequency CAL 50MHz MHz MHz MHz MHz Mhz MHz MHz MHz MHz GHz GHz GHz GHz GHz GHz GHz GHz Aarm imit vaue (ALM) The aarm imit vaue is used to monitor the dispay vaue automaticay. It contros the aarm indication function. The aarm imit vaue can be edited in the dispayed V/m unit. The smaest vaue that can be set to 0.05V/m. Aarm imit function is ony used for tota three axia vaue comparator. 4-5 Setting the meter Setting the units of measurement With the UNIT key as foows. (a) Eectric fied strength (V/m), (b) Computed magnetic fied strength (ma/m). (c) Computed power density (mw/m 2 ). (d) Computed power density (mw/cm 2 ) Setting the resut mode Instantaneous resut mode is automaticay set when the meter is turned on. With the MAX-AVG key as foowings : Setting the aarm imit vaue (ALM) Setting the caibration factor (CAL) 1. Press key turn off the meter. 2. Press and hod down MEM- and READ- keys, then press key to turn on the meter, the dispay then shows CA (The Caibration factor setting mode). There are four digits fashing which can be changed. 3. Press MEM- or READ- key to increase or decrease the vaue. 4. Press MAX-AVG key to store the new setting vaue and exit Switching the aarm function on or off 1. Press ALARM-MODE key for 2 seconds to switch the aarm function on or off. The ALM and symbos in the dispay indicates that the aarm function is on. 2. When the aarm function is on, the dispay wi show 1. Press key to turn off the meter. if the instantaneous measured vaue exceed the 2. Press and hod on ALARM-MODE key, then press key to turn on the meter. (The Aarm setting mode). The units and four digits fashing which can be changed. imit vaue Setting the audibe sound function off 3, Press MEM- or READ- key to increase or decrease the vaue. 4. Press MAX-AVG key to store the new setting vaue and exit

6 When the meter is normay turned on, the audibe sound function is on. 1. Press key to turn off the meter. 2. Press and hod MAX-AVG key and turn on the meter again to disabe the audibe sound, then the symbo wi disappear from the dispay Setting the auto power off function off When the meter is normay turned on, the auto power off function is on. 1. Press key to turn off the meter. 2. Press and hod READ key and turn on the meter again to disabe the auto power off function, the symbo wi disappear from the dispay Setting the backight auto off function off Short-term measurements Appication : Use either the Instantaneous or the Max. instantaneous mode, if the characteristics and orientation of the fied are unknown when entering an area exposed to eectromagnetic radiation. Procedure 1. Hod the meter at arm s ength. 2. Make severa measurements at various ocations around your work pace or the interested areas as described above. This is particuary important if the fied conditions are unknown. 3. Pay specia attention to measuring the vicinity of possibe radiation sources. Apart from active sources, those components connected to a source may aso act as radiators. For exampe, the cabes used in diathermy equipment may aso radiate eectromagnetic energy. Note that metaic objects within the fied may ocay concentrate or ampify the fied from a distant source Long-term exposure measurements Location Pace the meter between yoursef and the suspected source of radiation. Make measurements at those points where parts of your body are nearest to the source of radiation. Note : Use the Average or Max average modes ony when the instantaneous measurement vaues are fuctuating greaty. You may fix the meter to a wooden or pastic tripod Aarm function Use this feature in the Instantaneous, Max. instantaneous, Average or Max. average modes. When the instantaneous measured vaue exceeds the imit 1. Press key to turn off the meter. 2. Press and hod UNIT key and turn on the meter again to disabe the backight auto off function. 4-6 Making measurements 20 Important : The foowing effect wi be noted with a fied strength meters If move the sensor quicky, excessive fied strength vaues wi be dispayed which do not refect the actua fied conditions. This effect is caused by eectrostatic charges. Recommendation : Hod the meter steady during the measurement. vaue, a sequence of warning beeps sounded Manua data memory storing individua measured vaues The meter incudes a non-voatie manua data memory function which can store a maximum of 99 measured vaues Storing individua measured vaues The current memory ocation number appears in the ower right sma dispay. Once you press the MEM key, it wi store a dispayed vaue and pus one for the memory ocation number. Each fash of the M symbo dispay indicates one storage. The memory ocation number shows 99, to indicate the manua datamemory is fu, then you must cear the entire contents of the manua data memory before you store any new vaues Reading individua measured vaues 1. Press READ key, the dispay shows R (reading mode). 2. Press MEM- and READ- key to seect the desired memory ocation. 3. Press UNIT key to seect the desired reading units. 4. Press MODE key to seect the desired sensor axis reading. 5. Press MAX-AVG key to exit Deeting manua data memory measured vaues Once the memory is fu, you can cear the entire contents of the manua data memory. 1. Press to turn off the meter. 2. Press and hod MEM and turn on the meter again, the dispay then shows M and 3. Press READ- to seect to cear memory. 4. Press MEM- to cear memory. 5. MEASUREMENT PREPARATION 5-1 Battery Loading Remove the battery cover on the back and put a 9V battery inside. 5-2 Battery Repacement When the battery votage drops beow the operating votage, the mark appears and fashes, If it appears, the battery shoud be repaced with a new one