User Manual - EMF Detector
Contents
1. PeakHold mode for the same signal It might need several seconds or minutes of capture time in PeakHold mode to show the whole frequency spectrum of the WiFi WLAN or Bluetooth signals Fig 5 shows the Bluetooth frequency Hoping system frequency spectrum Fig 6 shows the spectrum for Microwave oven when it is ON which has very wide frequency spread The 2 4GHz band WiFi wireless LAN has frequency coverage from 2 400GHz to 2 485GHz The WiFi frequency band is divided into 14 channels Each channel is 22MHz wide There are also overlaps in between adjacent channels See below for the frequency used by each WiFi channel When ED15SA is in the Hold state and in the Channel display mode the signal level displayed is the Maximum value within each channel Since there are overlaps between adjacent channels the maximum value may spread around several adjacent channels Note Channel 1 Channel 6 and Channel 11 are not overlapped with each other and are used in typical WiFi Access points there are two notches in the ED15SA LCD display frequency axial to mark these three channels Next to the Maximum value of each channel Average signal level of each channel is displayed This can be used to see the distribution of signals in the WiFi frequency channels WiFi frequency spectrum captured by ED15SA can be used for WiFi WLAN installation and usage optimization Try to re assign the frequency channels used by the WiFi Access Point to avoid the conflicts b2. with hand or other objects 3 Measured RF field strength power density is shown on the digital LCD display with dBm and auto mw m uw m scale 4 8 LED lights With Red Yellow and Green color on the right hand side of LCD window is used for quick RF signal level Indications 3 Red LEDs are used to indicate the 3 safety range The power level of each LED can be found in the table on the ED15SA front panel The safety level standard of several countries can be found in the end of this manual as a reference 5 Histogram of previous 32 signal level readings are recorded and shown as vertical moving bar graph on the right of LCD display 6 Analog style Bar segment display can be used for relative signal strength indication 7 Toggle the 2 4 push button on off while in power meter mode can HOLD the reading of the LCD display 8 Most high frequency RF antenna such as Mobile phone base station is vertical polarized in vertical direction therefore the ED15SA is normally used in vertical direction Please rotate the ED15SA to find the maximum power reading direction to take care of high frequency RF wave reflections The ED15SA can also be used to find the signal source location by pointing the ED15SA RF sensor area toward the signal source and looking at the moving Histogram 9 Most of modern communication devices Mobile phone Wireless LAN Wi Fi etc use digital communication technology with burst RF signals Digital RF When m
3. April 1998 4 75Wim F 49 V m ONORM SU 6 33Wim Belgisch Staatsblad F 2001 1365 a ie 26 Deutsche Verordnung wah Decreto n 381 1998 switzerland Verordnung 1999 THN China Draft National Quality Technology 49 V m Monitoring Bureau 6 33W m 5 dBm up Safety range 3 Italy standard 0 1w m sq Caution RED2 10 dBm 0 058 wim Safety range 2 Swiss standard 0 04w m sq Caution Radio Radiation Protection 49 V m RED1 15 dBm 0 018 w m Safety range 1 Russian standard 0 02w m sq Caution Tanai Guidelines 1990 6 33Wim YELLOW3 T 20 dBm 0 0058 w m The 51 V m Netherlands Health Couneil 6 92W m 1850Mhz 59 V m 9 25W m 59 V m 9 25Wimn 61 V m 10 W m 30 V m 2 31 W m 59 V m 9 25 W m 83 V m 18W m 6 V m 0 1W m 68 V m 12W m 61 V m 10W m A sampling of international and national field strength limits for mobile communications YELLOW 30dBm 0 58 mw m frequencies GREEN3 35 dBm 0 18 mw m Wireless LAN WiFi typically in this range GREEN2 40 dBm down 0 06 mw m Some signal source around Table 1 Signal power strength power density conversion table Note Electromagnetic wave field strength power density decades very fast with distance distance square keep a good distance from the high frequency RF signal source can reduce the high frequency radiation effect Relocate the radiation source if possible Alumina foil or window sun reflector film silver color
4. CORNET Microsystems ED15SA Quick user s manual 9 12 2008 CORNET EDISSA Electrosmog meter with build in Spectrum Analyzer for 2 4GHz band is a pocket size affordable tool for quick measurement of High frequency RF Radio wave field strength 100MHz 3GHz power density and frequency spectrum of 2 4GHz band wireless applications It is designed for RF radiation safety level measurement and general wireless applications such as Mobile phone radiation safety level Base station antenna power level GSM WiMAX CDMA DECT phone WiFi WLAN Bluetooth cordless phone Zigbee microwave oven leakage wireless home audio video radio transceivers and other RF applications signals ED15 SA has two operation modes RF power meter mode and Spectrum Analyzer mode It has high sensitivity wide dynamic range and easy to read graphic LCD to display the frequency and signal strength of the RF signals It is excellent for individual or company with Electromagnetic wave safety concerns It is also an excellent tool for field measurement installation aid and analysis of WiFi wireless LAN or any other wireless communications applications in the 2 4GHz frequency band Features Power meter mode Frequency range 100MHz to 3GHz useful detection range High Dynamic range 60 dB High sensitivity 55dBm to 0dBm 25mv m to 14 8V m Peak power density measurement 1 5uw m to 0 58w m auto scale LCD digital power level and power density level
5. asured with Gauss meters such as CORNET ED25G RF LF meter 2 Spectrum Analyzer modes 1 There are two Spectrum Analyzer modes Normal Spectrum mode and PeakHold spectrum mode The RF signal strength and Frequency Spectrum is shown on the graphics LCD display with level in dBm and frequency in GHz 2 Two modes of spectrum analyzer operations a Normal Spectrum mode the ED15SA displays the real time frequency spectrum b PeakHold Spectrum mode the ED15SA hold and displays the peak value of the measured signal level for each frequency PeakHold mode is good for monitoring fast changing RF signals such as burst RF or Digital RF signals A PeakHold indicator P will be shown on the top right corner of the LCD display in this mode See Fig 1 You can change the operation modes by toggling the Mode cursor button which is the first button below the power switch The Mode cursor button will cycle through 1 Power meter mode 2 Normal spectrum mode 3 PeakHold spectrum mode 3 Max Signal Level of the entire 2 4GHz band In Normal mode or PeakHold mode the LCD will display the Maximum signal level measured for the entire 2 4GHz band in the top of the display This is good for applications such as Radiation Safety Level measurements maximum level detections The ED15SA updates the Max Signal Level dBm readout for every scan of the entire 2 4GHz band For Radiation Safety applications signal power level to power den
6. can be used as an effective and cheap shielding material for most of RF radiations The power density table is for RF radiation evaluation and reference only Official RF safety radiation measurement procedure is complicate and should be handled by trained technical person with lab instruments Safety range standard are listed here as a reference only ED15SA is not a medical instrument Please do not use it in medical legal or other related applications 2007 CORNET Microsystems Inc 1400 Coleman Ave C28 Santa Clara CA 95050 USA Tel 408 9690205 www cornetmicro com V 09 12 2008
7. display Moving Histogram display and Analog style Bar Segment signal level display 8 high brightness LED to display power density level with 3 safety range indications Continues wave AM FM and high speed burst RF GSM TDMA PCS CDMA Wi Fi WiMAX Super fast response time with easy reading color LED segment display Spectrum Analyzer mode Frequency range Standard 2 4GHz frequency band 2 4GHz 2 485GHz Wide Dynamic range 90 dB High sensitivity 106dBm to 12dBm Frequency resolution up to 333 KHz and 1 MHz Amplitude resolution 0 5dBm Signals Analog RF AM FM and Digital RF WiFi Bluetooth DECT Spread spectrum Display Graphics LCD frequency spectrum and signal level display Operation mode Spectrum PeakHold Hold cursor frequenccy level display General LCD back light 10 seconds auto off with manual on off control Size Small compact handheld design 65mmx130mmx25mm Battery operated 9V DC alkaline battery recommended not included in the package Applications High frequency RF Electromagnetic wave field strength measurement Mobile phone and Base station antenna radiation power density measurement Wireless communication applications AM FM TDMA GSM DECT CDMA WiFi WiMAX 2 4GHz band Wireless network frequency spectrum and signal level measurement Bluetooth device and RF wireless remote control device detection testing and setup Spy camera wireless bug fi
8. easuring this type of RF signals several LED lights will blink at the same time this is normal and can be used as an indication of Digital RF signals The rapid on off of RF signals used by Digital RF can be seen in the moving Histogram too For Analog RF continues waves AM FM signals the LED light will be stable ED15SA measures the peak power density of signal with very quick response time It is more accurate than the needle style of readout which is slow response and only shown the average value of signal power most of the time The Mobile phone GSM handset will contact the Base station every several minutes with very short burst of signals It can be seen in the ED15SA Histogram and power level indications RF radio wave signal level 1 2007 CORNET Microsystems Inc 1400 Coleman Ave C28 Santa Clara CA 95050 USA Tel 408 9690205 www cornetmicro com changes with the environment temperature weather nearby objects and Reflections Therefore relative comparison using Histogram to find the Maximum level area is suggested 10 ED15SA is a broadband High frequency RF type of Electrical field measuring device It is used for applications such as Mobile phone base station antenna radiation Microwave oven Cellular cordless phone Radio transmitters and WiFi wireless LAN installation aid Itis not for low frequency magnetic field measurement AC power line transformer high voltage power transmission line motor which should be me
9. etween each other Data traffic information for each frequency and channel can be estimated by the frequency channel spectrum too MAM 29dEmE iMAe bDdEoG 1 NAKS 20dBm MAH 50dEra 24G 4142 43 4445 4614 Z4GHI42 43 4445 496 14E 24G4I42 43 4445 46 414E ZAG AINE 43 4445 46 114E Fig 2 Analog RF Fig 3 Digital RF w o peakhold Fig 4 Digital RF with peakhold Fig 5 Bluetooth CH I1 MAX 10dBm 15dEm WekeiG 60dEm CH1 2345678 SII E4GHIHE 43 4445 465146 FHGAIHE 43 SYMS ME ATME Fig 6 Microwave oven Fig 7 Hold freq cursor Fig 8 Hold channel cursor WiFi Channel assignment in GHZ TAOT Ch1 2 424 2426 Che 2 448 2 451 Chit 24T 2 456 Chi2 2 47 The European Community provided general guidelines in its Council Recommendation of July 1999 ICNIRP published similar guidelines in April 1998 Table I gives a sampling of the international and national field strength limit values for the general public and 2 80 Cho 2 426 2 431 Ch tasi FLAW Ch 24 2436 Che 24538 24Et Chia 2 86 2421 Chf 2 443 2446 Chid 2 48 F Siaa RF radiation safety EDI5SA can be used to monitor the RF radiation level for safety purpose Many 2 4GHz band applications have high RF transmit power For WiFi WLAN the maximum transmitter power output is 100mw which is 20dBm For several WiFi device operated at the same time in the same location area it is possible that the RF radiatio
10. le in Hold state 6 Cursors The cursor in the Hold state can be used to measure the Signal level for the specific frequency or channel in the Frequency Cursor or Channel Cursor location Use the Mode cursor button 1 push button to move the Cursor Pushing and hold the Mode cursor button a little bit longer time will move the cursor quicker along the horizontal axial The Cursor will wrap around when it reaches the end of the screen NOTE the level displayed in the Channel Cursor is the peak value within each channel The Average value within the 22MHz channel bandwidth of each Channel is shown next to the Peak value There are overlaps in adjacent WiFi channels The cursor is used in the Hold state only 3 LCD backlit auto off control and Battery low indication LCD backlit will ON when the _ EDIS5SA is power up It will auto off after 10 seconds to save the battery power To turn on off the LCD backlit manually go to power meter mode get into HOLD state then toggle the 1 push button to tum on off the backlit manually If the 9V battery is below the 5V threshold the BAT Low indication will ON in the initial LCD screen when the ED15SA is power up The ED15SA continues working until the battery dies When the BAT low is on there will be no LCD backlit Please replace the battery when BAT low is on to make sure the ED15SA is working properly Spectrum Analysis tips There a
11. n level will exceed the maximum safety level standard The WiFi Access Point location is important since it is busy most of the time and transmits a lot of RF power Try to move the Access Point to the location that is far from where the people stay most of the time The 2 4 GHz DECT cordless phone base unit is also could be a problem DECT phone base unit will poll all the satellite units hand set all the time to make sure it can communicate to each other It will transmit RF signal all the time Therefore Do Not places the DECT cordless phone base unit on the night stand next to your bed ED15SA can be used to measure the RF radiation level for each frequency radiated from the device in the 2 4GHz band Or broadband in 100MHz to 3GHz range Microwave oven leakage can be monitored too Table 1 shows the conversion table for power level dBm measured by ED15SA to power density level w m which is used for maximum radiation safety standard The Three RED color area is the National safety standard used by three different country Try not to exceed these radiation levels if possible Relocate the device use shielding etc th power density table Power level Power density Field stren reference only Indication YELLOW2 1 8 mw m continuous exposure 950Mhz Intemational Council Recommendation 42 Vim 1999 519 EC 4 75Wim ee 42 Vim ICNIRP Guidelines
12. nder WiFi wireless LAN setup installation detection exploration and optimization Wireless security system maintenance Radio transceivers power output level measurement Cordless phone DECT phone radiation safety level measurement Microwave oven leakage detection Wireless Home audio video devices video sender baby monitor Short range wireless devices Zigbee Wireless USB Wireless keyboard mouse etc Personal living environment EMF safety evaluation Signal power level scale in dBm GdBm ta 100dBm each step is SdBm akHald mode alor Cursor far frequen sig power level in Hold state only Frequency Spectrum Frequency scale 2 400GHz to 2 484GHz or Channel number CH 1 to CHEIA Power switch mode curso h e key RF power ievel to power density leva table Fig 1 Usage guide There are two modes of operations of ED15SA power meter mode and Spectrum Analyzer mode Push the first button below the power switch will change the ED15SA operation modes in 1 Power meter mode 2 PeakHold spectrum mode and 3 Normal spectrum mode in sequence 1 Power meter mode 1 Put the 9V battery in the ED15SA Handle the ED15SA with right hand in vertical direction and push the power switch button The ED15SA will come up with Field strength Power meter mode first 2 The RF sensor is located in the left hand side of the ED15SA Please do not cover the RF sensor area
13. re two types of RF signals used in today s wireless communication systems i e Analog RF and Digital RF signals The traditional AM FM Analog RF signals are continues wave signals The frequency spectrum of this type of signal is stable and easy to capture AM FM radio analog cordless phone wireless spy camera remote control and Radio transceivers are some examples of Analog RF signals Typical Analog RF spectrum is shown in Fig 2 Both Normal spectrum mode and PeakHold mode can be used for Analog RF signal Digital RF signal is burst type signals it is used in digital communications such as Mobile Phone GSM WiMAX WiFi wireless LAN Bluetooth Zigbee DECT phone and most of the new wireless Home audio video devices This type of signal is transmitted very fast in short bursts to share the frequency bandwidth between several different devices In order to capture the frequency spectrum of Digital RF signals tracking of the RF bursts are necessary If the spectrum analyzer is out of sync with Digital RF burst signal or the burst ON time is short only short spike of spectrum will be shown The typical Digital RF signal frequency spectrum in Normal Spectrum mode is shown in Fig 3 In order to show the full spectrum of Digital RF signal the PeakHold mode can be used In PeakHold mode the spectrum analyzer will overlap the PeakHolded signals captured several times to reassemble the whole frequency spectrum of the signal See Fig 4 for the spectrum in
14. sity conversion reference table is in the lower left hand side of the EDI5SA front enclosure See RF radiation safety section for details The EDISSA Spectrum Analyzer mode is a narrow band design the signal indicated is for the specific frequency For wide band RF signals such as WiFi wireless LAN each channel bandwidth is 22MHz wide you need to integrate all the signal levels in the 22MHz bandwidth to get the total signal power of it The EDISSA power meter mode is a broad band design it shows the total power level measured in the bandwidth 4 Mode Cursor button The 1 push button below the Power Switch is used to change the operation mode of the ED15SA in between RF power meter mode Normal Spectrum mode and PeakHold Spectrum mode It is also used to move the Frequency Cursor or Channel Cursor while in Hold state 5 Hold button The 2 push button is used to get a snapshot or to Hold the scanning of the frequency spectrum Once in the Hold state the spectrum scan will freeze and the LCD will display the signal level and frequency in the Frequency Cursor location Push the Hold button again it will display the Average signal levels Push the Hold button again it will show the signal levels of 14 WiFi channels in Channel Cursor location Push the Hold button again to get out of the Hold state and start the spectrum scanning again Use the Mode Cursor button 1 push button to move the cursors whi
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