NHT-310 User Manual
Contents
1. 6 2 a 474 3 0 n dB l Fig 6 5 1 Measurement unit By default the unit shows the parameter related to the connected probe V m for E probes uT for B probes A m for RF H probes and mT for static H probes Pressing the MODE UNIT key the user can sequentially change the default unit to the required alternative V m A m W m mW cm Using this function the instrument calculates the mathematical conversion applying specific algorithms This function is useful when for example the far field hypothesis applies to the place of measurement i e when the distance from the source is at least 2d A where d longest linear dimension of the antenna source and A wavelength of measured signal then it is possible to obtain magnetic field value H using an electric field E probe or vice versa 2 Environmental temperature Indicates the environmental temperature measured by the integrated sensor on the front part of the unit The temperature value shown is more reliable when the unit is operating on a tripod and not in the user s hand which may affect the accuracy ofthe measurements obtained 3 GPS coordinates Pressing GPS ON key enables the GPS integrated module after approximately 2 minutes in outdoor conditions it is possible to read the GPS coordinates identifying the test site The Longitude and Latitude coordinates alternate on the display 4 Dat2. Measurement probes Several measurement probes are available to be used in conjunction with NHT310 both for magnetic and electric field measurement from dc up to 40 GHz Each probe 1s automatically recognised by the NHT310 when inserted See paragraph 1 7 2 for a detailed list of the NHT310 available probes GPS module and temperature sensor The NHT 310 incorporates a GPS module which acquires geographic coordinates identifying the site where the measurements were registered In the case of outdoor activities it 1s always recommended that the user includes the GPS data related to the test site so they may be included in the final report This feature 1s particularly useful when evaluating EMF background around new radio base stations Environmental impact of transformer stations Exposure mapping of an extended geographical area No additional devices are required when carrying out these measurements as the NHT310 performs these tasks automatically It provides both the field measurement values and GPS coordinates of the site The MicroLink software allows the user with to display the coordinates on Google Maps In addition NHT310 incorporates a temperature sensor which acquires the temperature value during the measurement activity Since the sensor is installed in the front section of the instrument it is recommended that the temperature value be accepted only if the unit is installed on a tripod and not in the operato
3. 15 24 08 10 16 51 35 16 50 55 24 08 10 24 08 10 16 50 15 24 08 10 16 49 35 24 08 10 4 C Users Leonardo Documents ufficio prova uR 16 57 35 1A SA 15 S 24 08 10 24 08 10 16 55 35 16 54 55 24 08 10 24 08 10 16 54 15 24 08 10 TASTAR 24 08 10 24 08 10 24 08 10 24 08 10 NHT310 Fig 7 11 Note the numeric value related to the points under the pointer are indicated when the moving the mouse over the chart If the user wishes to highlight a specific portion of the screen and consequently the values associated with it he may do so by dragging the mouse while holding down the left button over the area of interest Fig 7 12 a 8 dae wai g a g86 ki if 10 0 emai id sj461s tf 180 Avg V m 30 3 The image export function is accessed by clicking on the export image Fig 7 12 icon Export image a window allows the user to make various choices see Fig 7 13 40 NHT310 7 MicroLink software Q Inverted Original w Apply kg Close Fig 7 13 The user can select the output file format BMP or JPG and choose to use the original chart colors or he may wish to invert the color set white on black rather than black on white to reduce the report printing costs 7 7 Exporting data to Microsoft Office Excel Export LI i v After downloading data the user can save it on a PC drive unit by c
4. 7 7 Using the Open command it is possible to recall previously saved data file uR extension After data has been downloaded or after a save file has been opened a window within the MicroLink programme opens and shows a panel featuring three selectable tabs SnapShots Monitoring Plot 35 NHT310 7 6 1 SnapShots are the measurements stored manually one by one single store a Snapshots MicroLink N File Meter Data Help TA 4ew 7 MicroLink software SnapShots Monitoring Plot N Record 12 432 Spatial Avg n a Nr Time Iso Avg Max T C Filter Probe Gps 1 09 01 00 5 33 46 0 00 V m 0 00 V m 0 00 V m 1801 003 V m Tavg 360s 2147 484 V m 5 25 AN e OIE 2 06 02 00 0 11 18 0 07 V m 0 00 V m 0 05V m 0 08V m 0 17 V m Tavg 360s 1 42 V m 0 08 53 0 28 1 Off 01E Of 3 06 02 00 0 34 25 0 07 V m 0 00 V m 0 04 V m 0 08 V m 0 35 V m Tavg 360s 1 42 V m 00 08 53 0 28 3 Off O1E Off 4 06 02 00 0 34 33 0 06V m 0 01 V m 0 05 V m 0 08 V m 0 35 V m Tavg 360s 1 42 V m 0 08 53 0 28 3 Off O1E Off 5 06 02 00 0 34 39 0 07 V m 0 00 V m 0 04 V m 0 08 V m 0 35 V m Tavg 360s 1 42 V m 0 08 53 0 28 4 Off __O1E Off 6 06 02 00 0 34 47 0 06 Vim 0 00 Vim 0 04 V m 0 08 V m 0 35 V m Tavg 36
5. LEGEND o ii iaia 12 eM E o cena 12 4 2 Connectorand Interface legend eii das 15 gt Pioparglio lorelai 17 Jal o A ER EAE 17 Di LOLS abo kit ki k e a success e a DS a e a D e a te eee RD Yen NE 17 So COMMS CUMS AV PWO DC file a kte ra oi n lai 17 JA AM POW TSDD geen nee eR a ed AO ios 18 PA OO 19 O A lille 19 O OPA 20 Gl A eee ba n e Pe RED 20 6 2 Mainscreen measurement display A n kk e l da n e a e a a a t kb ako ea 23 0 5 Recording measured Valles a aridi 25 Go Single yale Storni ii oo ae ai oto bi a ka dokt a ai a a a e ka ka e a etone den ee 25 6 3 2 Storing Multiple Values monitora cipria be piw ties al e ia ot ka k ets Det l la pe SR 26 64 Data tramster and display ke do tou ak tea ao ba ia tek bdl e nt bo on d k e desi de kb otan kk bk tek tan fi kes n de 28 6 93 palta A Ve ta ge Modes orli li oo a de io ae ek io kitan 28 GIO Alen leve L saj ka tet l ki ot te aka a tise A ee a n e De RED 28 Oni FICO TO TOU bab ta t a ki a aa ab a a a a n a n ke e e ka ao tata aaa ai 29 1 MictoEtnk SOFTWARE td s el ko needa kanse eet pepe a 30 al DESC PO Mie ba ki di pi cu a e e e ese ide it 30 2 Solwarcanstallanon s silicio 30 Lo AN MA SOHC carat A A A A 31 Tet Te VNC TIONS oeil in e ik a e a a ak A kak a az 32 7 5 Configuring parameters on NHT310 unit Settings 33 7 6 Downloading data from NHT310 unit Download 35 A OO SON falena leone 36 POZ onio
6. Standard reset of time average AVG SHIFT enabled reset of MAX value measured ALARM key e Fnables and disables acoustic alarm which is triggered ALARM when exposure threshold has been exceeded FILTER key a Enables and disables a filter dedicated to low frequency probes Tab 4 1 Keyboard legend NHT310 4 Basic Unit Legend 4 2 Connector and Interface legend The tables below refer to the connectors and interfaces available on the back and at the top of the base unit Fig 4 2 SMA connectors for analogue signal outputs from the three measurement axes X Y Z to be connected and analyzed using an external oscilloscope not included ANALOGUE OUTPUTS OPTICAL SERIAL PC 1 Fibre optic cable interface for connection to a remote Tab 4 2 Connectors Interfaces on the rear part of NHT310 NHT310 4 Basic Unit Legend Fig 4 3 Tab 4 3 Connectors Interfaces on the upper side Fig 4 3 LEMO Input connector for measurement probe BARREL JACK _ Battery charger input NHT310 5 Preparation for use S PREPARATION FOR USE 5 1 5 2 5 3 Unpacking As soon as the instrument arrives at destination please carefully check the packages to verify possible damages caused by shipment If any damage 1s found inform Microrad immediately It is recommended to keep the original packages for a future shipment due to for i
7. final report Operating modes 1 3 1 Single EMF measurements Main application of NHT310 is to execute single EMF wideband measurements The system can utilise a number of different probes depending on the physical parameter being measured magnetic induction magnetic field and electric field and frequency band required The LCD screen displays the following information Immediate isotropic value ISO of measured field level Time Average isotropic value AVG of measured field level Spatial Average isotropic value SPT of measured field level Maximum isotropic value MAX of measured field level Alarm threshold ALM Geographic coordinates GPS Environmental temperature Date and time NHT310 1 General information The instrument can be used in standard mode operating directly through its keyboard located on the front of the device The acquisition of single measurement values is always made by the user command STORE SINGLE Every single value 1s stored in a specific memory partition reserved for single measurements total 432 values in conjunction with general information regarding date time GPS coordinates environmental temperature and single axis X Y Z levels 1 3 2 Long term monitoring The NHT310 allows the user to perform up to 8 data acquisition sequences for long term monitoring of wideband electromagnetic fields This operating mode can be useful when conducting low freque
8. on the screen providing the square average value calculated using on all the N single instantaneous values stored This function is of particular use when the user wishes to quickly obtain the average of two or more values acquired in different spatial points ISU Uzm IHL Hi J HGE SPT 8 02524 Fig 6 11 Note that the SPT average value is also displayed in standard mode and the user may switch between this reading to the ALM alarm threshold Moreover the SPT average value is not cleared when the instrument is power down it remains in memory it is cleared only when the user enters the spatial average mode Alert level 28 NHT310 7 MicroLink software The NHT310 features a function which warns the user by way of an acoustic signal that the field being measured exceeds a threshold level which has been assigned by the user through the MicroLink software this alert function is enabled by pressing the ALARM ON key In addition to this function which is configured by the user the NHT 310 alerts the user when the measured field exceeds the 95 of the range of the probe This is accomplished by displaying both an E character Fig 6 9 and by the use of acoustic signals The E character always appears near the isotropic value and also near the axis which has exceeded 95 of range limit of the probe being used 24 35_ C 41 E364 113 GPS Off Yi 1108 2715 16 49 13 2 17 6856 4 Fig 6 12 Finally when the field stren
9. 0s 1 42 V m 0 08 53 0 28 4 Off 01 OF 7 06 02 00 0 34 59 0 06 Vim 0 01 Vim 0 05 Vim 0 08 V m 0 35 V m Tavg 360s 1 42 V m 0 08 53 0 28 4 Off oe of 8 24 08 10 16 48 06 0 04 V m 0 01 Vim 0 06 V m 0 07 V m _ n a 0 25 V m 05 00 04 0 30 7 Off 01 Lock 9 24 08 10 16 48 13 0 05 V m 0 01 V m 0 06 V m 0 08 vim n a 0 25 V m 05 00 04 0 30 8 Off 01E J Lok 10 24 08 10 16 48 18 0 04 V m 0 00 V m 0 06 V m 0 08 V m n a 0 25 V m 5 00 04 0 30 8 Off 01 Jl Lock 11 24 08 10 16 48 27 0 05 V m 0 00 V m 0 07 V m 0 08 V m n a 0 25 V m 05 00 04 0 30 8 Off Q1E Lock 12 24 08 10 16 48 32 0 05V m 0 00 V m 0 06 V m 0 08 V m n a 0 25 V m 5 00 04 0 30 9 Off O1E Lock C Users Leonardo Documents ufficio prova uR NHT310 Fig 7 8 Each measurement which corresponds to a table row includes the following data e Univocal progressive number up to 432 e Date and clock time e X axis Y axis Z axis instantaneous field value e Immediate Instantaneous Isotropic value ISO e AVG value available only if the minimum interval time configured for time average calculation has elapsed e MAX isotropic value e Temperature e ON OFF filter only for low frequency measurements e Measurement Probe information by clicking on the specific field a windows appears with data pertaining to the probe utilised during the measurement e GPS Lock Off if the GPS is active and
10. 155 Apply A Close Fig 7 4 Alarm Settings Alarm Threshold Level High Frequency Probe A m mWicm mT Low Frequency Electric Probe 5000 15 Apply LA Close Fig 7 5 Meter Clock Settings Date and Time Alarm Settings Configuration of the alarm threshold for strong field level High Frequency Probe level and measurement unit when high frequency electric E and magnetic H probes are applied Low Frequency Magnetic Probe level and measurement unit when low frequency B probe is applied Low Frequency Electric Probe level and measurement unit when low frequency E probe is applied Meter Clock Settings Configuration of date and clock time on NHT310 unit 34 NHT310 7 6 7 MicroLink software Downloading data from NHT310 unit Download After connecting NHT310 to the PC through the fibre optic cable and adapter click the icon Download The download starts and a progress bar appears during the download Fig 7 7 At the end of the download process it is possible to save measurement data on a PC drive unit This action is not mandatory since it can be done also later clicking on the icon Save This activity allows the user system to clear the NHT310 unit s memory bank tes MicroLink File Meter Data Help iH JA ON Fur ea MICR RAD No File Loaded NHT310 Fig
11. Available space for single measured value 432 measurements Available space for monitoring sequence 21 504 measurements 6 3 1 Single value storing Each time the user wishes to save preliminary values and to immediately record acquire what the display shows he just has to press the STORE SINGLE key This action stores the instantaneous measurement value together with related display data ISO X Y Z values time 25 NHT310 7 MicroLink software date GPS coordinates when active temperature MAX value AVG value when available probe data During this storing process the display shows the message as shown in Fig 6 8 it informs the user about the actual number of stored values vs total available DATA STORED IH MEMORY 5 432 Fig 6 8 6 3 2 Storing Multiple Values monitoring The instrument can execute a time continuous monitoring activity recording measured values from a START time to a STOP time which is user defined The sampling time for this function defaults to 5 seconds but it can be easily changed through the MicroLink software One sample is essentially a tern of X Y Z field value Temperature and the initial GPS position when available are stored Note that GPS and backlight should be switched off when monitoring starts in order to conserve the life of the battery The instrument allows the user to store up to 8 different monitoring sequences However the sum of all the samples from all the sequen
12. C to 50 C Non operating transport 20 C to 70 C Humidit 5 to 95 non condensino Size h x wx dl 160 x 98 x 30 mm without probe Weight approx 400 g including batteries without probe Accessories included Hard case AC charger rechargeable batteries PC software e eee fiber optic 10m USB Optical Converter operating manual probe s calibration certificate Note technical specifications are subject to change without prior notice 8 NHT310 1 General information 1 7 2 Measurement probes Radiofrequency field probes Frequency range 100 KHz 6 5 GHz 400 KHz 30 MHz 300 KHz 30MHz 100 kHz 18GHz 3 MHz 40GHz Measurement range 0 5 350 V m Rec calibration interval 24 months Low frequency field probes IA NB 20B i00om 30B 100 om Type of freq Response Flat Measurement range 0 3 ul 16 mT Directly stri Rec calibration interval 24 months Operating temperature 0 C 50 C Static field probes PN Probe A A O Frequency range DC 1 KHz Type of freq response Flat Measurement range 200 uT 600 mT Directivity Isotropic Rec calibration interval 24 months Operating temperature 0 C 50 C Note technical specifications are subject to change without any prior notice 1 8 Standards compliance Electrical equipment for measurement control and laboratory use EMC requirements a pa a pr I CEI EN 61326 emission radiating immunity in radio frequency electrostatic discharge Safe
13. IT LEGEND 4 1 Keyboard legend The following table refers to Figure 4 1 which shows the numeric and function keys on the front panel of the base unit Some keys have a second function indicated in blue and can be enabled by pressing the SHIFT key located in the middle of the keypad before pressing the required function key The following table makes reference to Fig 4 1 showing function keys on the front panel of basic unit 1 gt 2 d i a i n 5 4 9 12 6 7 13 8 9 14 10 11 15 NHT310 4 Basic Unit Legend atea Probe comector Battery changer input E A Display and Backlight e Temperature sensor MODE key Standard changes measurement unit SHIFT enabled shows single axes X Y Z STORE key Standard stores a single value SHIFT enabled starts monitoring LIGHT key Standard temporary back light of display SHIFT enabled continuous back light of display SHIFT key Enables all blue defined functions POWER key Switches on and off the instrument GPS key Enables and Disables GPS module jw jw GPS BATTERY a CHARGING Blue LED of battery charging in progress n N ka NHT310 4 Basic Unit Legend RESET key
14. NHT 310 User Manual n gt attese A PI E b l MICR 6 RAD Design Development and Manufacturing MICRORAD P zza delle Azalee 13 14 05019 Orvieto TR ITALIA Tel 39 0763393291 Fax 39 0763394423 email microrad libero it web www microrad it MICR 6 RAD Release 2 3 February 2014 II CONTENTS E FAN WO MMA AA r aaa a a ei 4 lil APP NAT NON eae caveat EE T e pe a ad bo be e pak ee in 4 L gt Abourthe TAS AAA CAN ka e ke e a kn a a fe ke a sue e aol ak i 4 1E Operin MOUCH sibi zi ke dent ka ad eta kt a be ot e a kl e l a n a ba ant e e tela 4 kok tiple ME measure mens tia 4 k32 a AE ie 5 1 3 3 NHT310 remote control using MicroLink software 5 1 3 4 Downloading data from NHT310 to PC using MicroLink software 5 1 4 Measurement Pros iene 6 1 5 GPS module and temperature sensor ir 6 J 6 MCAS ime A es lon son ere 7 1 Fechniicalspee Mea O NS ida 8 EE NHI Ount SPESCHICITONS elitt as ont ga vite eke Ge ie gani ESEE ate sa ane Si RO eni 8 TZ Measurement PWO D S kit oka aa oi pi e kn ot 9 LS Standards COM PI NAN GE lt liana ii ire 9 Dm SUSINO eee a kan eine ie a ob Dora tate seal n denon on n e ko bk a RA bi e boo ni atake 10 kl fonica 10 22 RAE 10 di Cerlinceanon and Wat A A 11 A ta ai oun RR II O 11 32 Wilde Se De on e ree es 11 3 97 AAA tono WV atl A V koko a en kk ads a a a a n l n n to e a ieri 11 4 BASIG it
15. ation of the unit A complete recharging cycle requires approximately 4 hours e WARNING Never connect the battery charger if dry batteries are installed This procedure may result in significant damages to the instrument Disregarding the above rules causes the warranty expires Battery charge status is always indicated in upper right corner of the display in each operating mode ISU Wt GPS Off 12 42 56 During the recharging cycle a blue led indicator appears in the top right hand corner of the display BATTERY CHARGING NHT 310 NHT310 5 Preparation for use 5 4 1 Operating time The operating time of the standard batteries provided with the system when fully charged is in excess of 72 hours of continual use backlighting off Dry battery operating times may exceed those of rechargeable batteries WARNING Never use rechargeable batteries which are different to those supplied with the instrument Note use of battery chargers different to that supplied may result in damage to both batteries and instrument 5 4 1 Replacing the batteries The battery compartment is located under the rear panel of the instrument see Fig 5 4 Fig 5 4 1 Switch off the instrument and disconnect it from all other devices AC Charger USB adapter 2 Open the battery compartment at the back of the instrument using the appropriate screwdriver 3 Remove old batteries and dispose of them according
16. avg Time parameter at the moment set for the processing of the mobile window average function Once the power on information sequence has terminated and a probe has been inserted into the instrument the following information will be displayed see fig 6 3 The same information is displayed each time a probe is connected to the instrument this information remains visible on the screen for a few seconds PROBE DATA 9 gt P Hi B 10 SHE A 11 gt Ped 1 i 12 gt Lal 13 gt Tue GHZ 21 NHT310 7 MicroLink software 9 P N Probe Part Number 10 S N Probe Serial Number 11 Prd Probe production date 12 Cal Probe calibration date 13 Typ Probe frequency interval In the case where there is no probe inserted in the device then the following message 1s displayed on the screen Fig 6 4 RETI ki HU PROBE 25 1 C AUG GPS Off MAK 13 02 46 ALM 22 NHT310 6 2 7 MicroLink software Main screen measurement display After the power on operation and probe connection a probe warm up phase commences and the time taken for this process is dependent on the specific probe being used during the warm up phase the display shows zero blinking values finally the main screen measurement appears Fig 6 5 10 11 v v gt ISU Le m SHIFT C 5
17. ces cannot exceed 21 504 samples The monitoring recording sequence begins after pressing STORE MONIT Then the instrument starts a countdown defaults to 15 seconds but user can change it using MicroLink software before beginning the storing sequence allowing the user to distance himself from the unit and avoiding creating undesired EM disturbances during the measurement process During the countdown the number of the monitoring sequence 1 8 is displayed Fig 6 9 If needs be it 1s possible to abort the countdown sequence by pressing any key 26 NHT310 7 MicroLink software MONITORING 3 pi dad Fig 6 9 During recording the screen shows the current monitoring sequence number 1 8 the sampling time the elapsed time from when the recording commenced and a dynamic indicator bar which proportionally increases in length according to the number of samples stored in memory and remaining space available Fig 6 10 An empty bar indicates that no samples have been acquired No monitoring has taken place Full memory corresponds to 21 504 samples n MONITORING 3 Ts amr le 5s Gih 24m 37s Fig 6 10 The device will continue monitoring until the memory bank is full 1 e the bar is full or the user wishes to stop or interrupt the monitoring process which he may do by pressing any key If the unit memory already contains 8 monitoring sequences or 21 504 sample and the user attempts to start a new re
18. con the user can access a configuration window Fig 7 2 which contains a number of NHT310 modifiable parameters These parameters include e RMS Average time interval for AVG calculation e Monitoring start stop time and store sampling time e Alarm Level threshold level for acoustic alarm e Date amp Time date and time on NHT310 unit Meter Settings 1 RMS Average Monitoring Alarm Level Date 8 Clock e L3 Close Fig 7 2 The user may modify the parameters from the control panel as follows RMS Settings RMS Average Period Min ela e gt Apply Ls Close Fig 7 3 RMS Settings Configuration of the time interval for the AVG calculation time average The default value is 6 minutes according with International laws and guidelines This configuration is important for high frequency measurements 33 NHT310 Monitoring Settings de Y Monitoring Parameters Sampling Time Start Delay Start Time day month year 31 Dec v 2010 Stop Time Stop after 42 os w from start 7 MicroLink software Monitoring Settings Configuration of e time interval between one acquisition and the following Sampling time from 1 up to 30s e delay time from start Start Delay e time programmed monitoring Enable e date and time of monitoring start Start Time e date and time of monitoring stop Stop Time
19. cording sequence a message MEMORY FULL appears on the screen and the monitoring is cancelled In order to restore the monitoring capability the user must download to the PC and then clean all the data using the MicroLink software or perform a hard reset as shown at paragraph 6 7 Alternatively the user may start and or stop a monitoring sequence using the programmed time function set within the MicroLink software this function allows the user to set the monitoring start and stop time Activation of this function is shown on the screen by a blinking character positioned near the ISO value just recorded 27 NHT310 6 4 6 5 6 6 7 MicroLink software Data transfer and display In order to show the recorded data the data must first be transferred to a PC through the fiber optic cable the Fibre USB adapter and the MicroLink software included in the standard package See chapter 7 MicroLink software for the detailed procedure Spatial Average Mode By pressing the STORE SINGLE key holding it down for about 4 seconds the user can enter the Spatial Average Mode the same operation can be repeated to return to the standard mode When this special mode 1s enabled the message MODE SPATIAL AVERAGE appears in the location which is usually reserved for temperature GPS date and time Fig 6 11 It is now possible to save single values by pressing STORE SINGLE as described in chapter 6 3 1 and an SPT indicator is displayed
20. e UserStop indicates that a manual monitoring stop command has occurred e g the user may have accidentally touched the instrument s keypad As a result the last data reading may be compromised due to the proximity of the user Other means of halting the monitoring process are by a by remote control b allowing the instrument s memory bank to fill to capacity FilterStat reports the low frequency filter status during monitoring The Avg24h control allows the user to enable the 24h moving average in the Avg column by setting Tavg 24 hour In this case there is a requirement for a monitoring sequence longer than 24 hours The Time slot considered for the processing of the time average Tavg performed by the MicroLink software Minimum Min and Maximum Max instantaneous isotropic values from the data sequence Maximum of the average values AvgMax Median index Note that the max average AvgMax index is displayed only when monitoring is performed using radiofrequency field probes vice versa Median index is calculated only when using low frequency or static field probes 38 NHT310 7 MicroLink software Data regarding the probe and the GPS position related to the selected monitoring sequence are accessible through the icons shown below Fig 7 10 GPS time and space coordinates refer to the place and the time at which the monitoring commenced r t Monitoring Probe n Mo
21. e and time Date and time alternate on the display 5 Charge status This icon refers to the charge status of batteries 23 NHT310 7 MicroLink software 6 Measured value It is the immediate isotropic measured field value 7 AVG value This indicator displays the square mean value average in a mobile time slot To reset this value press RESET AVG The default time slot for this AVG value is 6 minutes This value can be changed through the MicroLink software The AVG value remains empty until the configured AVG time has elapsed since power on or since the last AVG reset As soon as it becomes available the AVG value is continuously updated mobile average with new measured samples being added to the calculation and old ones deleted This allows for the calculation of a dynamic average of a fixed number of samples 8 MAX value Displays the maximum value which has occurred since the device has been switched on or since its last reset This value is updated only if a higher value occurs To reset this value press RESET MAX 9 ALM level or SPT value Pressing the ALARM ON key the threshold value for activating a warning acoustic alarm appears This threshold can be configured through the MicroLink software The user may alternate between alarm level and space average value SPT values which are indicated in the same physical space in the display 10 LPF filter By pressing the FILTER ON key when a low frequ
22. ency probe i e probe such as the 10B 11E is plugged into the device the message LPF is shown A second order Low Pass Filter 40dB dec with cutoff frequency at 1K Hz is enabled This may be useful for example when measuring 50Hz sources with some related harmonics thus cutting out higher frequency sources Below the filter diagram Fig 6 6 100 Freq Hz Fig 6 6 24 NHT310 7 MicroLink software In the case of static field probes 1 e 20H 30H the filter acts as a first order High Pass Filter 20 dB dec with cut off frequency around 1 5Hz filter activation is highlighted by the HPF message on the display Essentially the filter cuts the DC component out of the signal thus allowing the user to discriminate between static components and higher frequency magnetic fields 11 SHIFT This indicator appears after pressing the SHIFT key meaning that all the blue functions on the keyboard are selectable 12 X Y Z this values represent the X Y Z field components Fig 6 7 They take the place of the AVG MAX and ALM values after pressing the MODE AXES key ISO mT 474 35 C GPS Off 16 69 13 12 6 3 Recording measured values The user can record the measured values using two different ways e Manual storing of the single measured value e Automatic storing of a measurement sequence monitoring The instrument reserves two different memory spaces for the two recording modes
23. ertifies that this product met its published specifications at the time of shipment from the factory Microrad further certifies that each probe of NHT310 instrument has been calibrated according to DIN EN ISO 9001 2008 rules On request is also available a calibration certificate traceable on 17025 standard concerning electric and magnetic field strength and electromagnetic power density for the high frequency range Warranty This Microrad product is warranted against defects in material and workmanship for a period of 24 months basic unit and probes Accessories are warranted for a period of 6 months During the warranty period Microrad will at its option either repair or replace products that prove to be defective For warranty service or repair this product must be returned to Microrad User shall prepay shipping charges to Microrad and Microrad shall pay shipping charges to return the product to User Microrad warrants that software and firmware designed by Microrad for the instrument use will execute its programming instruction when properly installed on that instrument Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by User User supplied software or interfacing unauthorized modification or misuse operation outside the environmental specifications for the product or improper site preparation or maintenance NHT310 4 Basic Unit Legend 4 BASIC UN
24. g 360s 30 5 85 24 08 10 16 55 55 _ 0 05 0 00 0 05 0 07 0 08 Tavg 360s cal L 86 24 08 10 16 56 00 0 05 0 00 0 04 0 06 0 07 Tavg 360s sel 87 24 08 10 16 56 05 0 05 0 00 0 05 0 07 0 07 Tavg 360s 30 4 88 24 08 10 16 56 10 L 0 05 0 00 l 0 05 0 07 0 07 Tavg 360s sd 89 24 08 10 16 56 15 0 04 0 00 0 05 0 07 0 07 Tavg 360s 30 4 90 24 08 10 16 56 20 0 05 0 00 0 04 0 07 0 07 Tavg 360s cala 91 24 08 10 16 56 25 0 04 0 00 0 05 0 07 0 07 Tavg 360s 30 4 C Users Leonardo Documents ufficio prova uR NHT310 Fig 7 9 37 NHT310 7 MicroLink software It is possible to store and keep in memory up to 8 monitoring sequences which may be selectable using the control on the top left corner below the Monitoring label The maximum quantity of rows 1s 21 504 considering all the sequences For each row sample the following information are available Progressive numbers starting from 1 up to 21504 until memory bank is completely filled Date and time X axis Y axis Z axis instantaneous field value Instantaneous Isotropic value ISO AVG value in this case processed by the MicroLink software considers utilises the Tavg parameter value at the time of the monitoring start Temperature Data included by the report table headers provide some very useful data Monitoring Start and Stop date and time Sampling time Tsample Number of acquired samples Nsampl
25. gth exceeds 100 of the range of the probe a message indicating OVER RANGE Fig 6 10 appears on the screen in place of the isotropic value this message is always accompanied by an acoustic signal ISO mi OVER RANGE 24 3 C AUG 248 558 GPS Off MRasar9 364 17336527 ALM Uff Fig 6 13 6 7 Factory reset To perform a factory reset on NHT310 unit press the RESET AVG key and hold for 10 seconds This action will erase all measurement data and will restore all NHT310 parameters to factory default 29 NHT310 7 MicroLink software 7 MICROLINK SOFTWARE 7 1 Description The Microlink software included in the standard package has three main functions The first is to allow the user to configure the instrument s parameters which control average value processing monitoring function alert threshold and clock time The second function is to allow downloading storing and displaying of data on a PC utilising tables and charts for final report generation This data can be exported using Microsoft Excel format The third function allows the user to remotely manage the NHT310 unit from an external PC connected through the fibre optic cable This mode is useful if the user needs to perform measurements e g safety measurements EMC test in anechoic chamber when the unit is installed on a tripod and the user is required to check the measurement progress from a distance in order to avoid potential EM disturbance
26. licking on Save icon in addition it 1s possible to export the data in Microsoft Excel compatible format by clicking on the Export icon A window Fig 7 14 enables the user to choose the characteristics of the data he wishes to export for both types of measurement output SnapShot and Monitoring The user may choose from the following All data Selection None The user can then save the file as an xls file Export Data SnapShot Data Monitoring Data All Selection Selection None None Y Apply Es Close Fig 7 14 41 NHT310 7 8 7 9 7 MicroLink software Remote control of NHT310 unit Remoting y After powering on the NHT310 unit and connecting it to a PC the user can now remotely manage all NHT 310 device functions by clicking on the Remoting icon This activates a double window on the PC monitor in one window the software replicates the entire front side of the instrument in the opposite window a real time chart is shown The NHT310 unit is easily controlled by way of a mouse which the operator uses to select the required functions on the virtual NHT310 keyboard which is reproduced on the PC screen p Real Time Plot Mi Scale ISO Lem BATTERY CHARGING 12 40 18 12 40 31 12 40 44 12 40 57 12 41 10 12 41 23 16 09 13 16 09 13 16 09 13 16 09 13 16 09 13 16 09 Fig 7 15 It is important to remember that the real time chart is not automatically saved i
27. locked during the measurement the text Lock appears By clicking on it a window with the related coordinates appears In addition there is a Map icon that allows the user to view the GPS coordinates on Google Maps this function requires that the PC be connected to the Internet 36 NHT310 7 MicroLink software In this screen it is also possible to obtain a spatial average value Spatial AVG by simply highlighting with a mouse at least 2 or more measurements and the Microlink software then calculates the Spatial Average using the AVG value already available This function is useful for instance when the NHT310 unit is placed on a tripod and stores measurements at different heights from the ground at the same site as many technical guidelines suggest The software allows the user to choose the values from which he wishes to calculate the spatial average by highlighting the values of interest and clicking on them while pressing the PC Control key CTRL The spatial average value will appear in the space just above the measurements list in the Spatial Avg field Note that there is a difference between the spatial average performed by the NHT310 using the spatial average mode par 6 5 and the one calculated by the MicroLink software the first takes the instantaneous field value as input the latter uses the time average value AVG already processed by the NHT310 7 6 2 Monitoring The table Fig 7 9 reports all the measured values sto
28. munications with the unit or when the MicroLink application is opened a communications window opens and informs the user that communication between the devices has has not been successful In the lower left corner of the screen the message No File Loaded is displayed until such time as a measurement file has been opened or saved on the PC After recalling a file its name and path are shown in the lower left corner of the screen 31 NHT310 7 MicroLink software 7 4 Functions Open Opens measurement files already stored on a PC storage units MT gr Save Saves a measurement file on a PC storage unit Properties Displays connected NHT310 unit information e E Download Downloads measurement values from NHT310 unit Ss Settings Sets NHT310 parameters Mo Remoting Remotely connects PC to NHT310 unit through fiber optic link for control purposes P Export Exports measurement data to Microsoft Office Excel compatible format 1 Units Sets Default unit selection for EMF and temperature Print Prints requested output Contents Opens this user manual About Regards software release information 32 NHT310 7 MicroLink software 7 5 Configuring parameters on NHT310 unit Settings z By clicking on Settings i
29. n remoting mode For every acquisition single store or monitoring sequence the user must execute the STORE SINGLE or STORE MONIT as previously described GPS and Google Maps If the GPS function is switched on during outdoor measurements and the position locked onto all of the downloaded data on the PC snapshots and monitoring will be associated with that GPS information time and coordinates The user can then display this information using Google Maps To visualise the GPS data on Google Maps the user must verify that the computer is connected to Internet then click on the Maps button in the window below Fig 7 16 42 NHT310 7 MicroLink software Monitoring 4174954 145 12 28 35 624 24 08 10 UTC 14 49 00 UTC Fig 7 16 The default system browser automatically opens the Google Maps webpage showing the position on the map of the site being tested measurement point erca sulle mappe Mostra opzioni di ricerca Google maps Monitoring 41 831707 12 476562 Indicazioni stradali Le mie mappe Stampa Invia es Link TCA ao s ES N fg y db d By Monitoring 5 ee Wo a gt Indicazioni stradali Cerca nelle vicinanze Salva e Seti i Wa Pi in Altrov poy vay i fi G A x a Ror x i J s a I x a W w Map data 62010 Tele Al s Y Fig 7 17 43 NHT310 7 MicroLink software 7 10 Firmware update of NHT310 unit Fw Upda
30. ncy B measurements since it allows the user to track the daily fluctuation of B field values based on the flux in the electrical lines or transformer stations field sources To start the acquisition sequence the user simply presses the key SHIFT first and then MONIT key The monitoring lasts until the specific memory partition or bank is full up to 21 500 values or until the user presses any key to interrupt the activity 1 3 3 NHT310 remote control using MicroLink software This operational mode is recommended in situations where the user is conducting electric field analysis and wishes to avoid any interference that may occur from other sources e g the user s own magnetic field which may have an influence on the field being measured or when there is a request to install the measuring system in a screened and controlled space such as an anechoic chamber for EMC testing In such a situation it is strongly recommended that a wooden tripod with variable height optional accessory be used The NHT 310 can be managed in remote mode through a fiber optic connection transparent non conductive material which is connected to an external PC Tablet running the MicroLink software provided as standard on the PC Microlink software installed on the PC Tablet allows the user total remote control of the NHT 310 unit replicating its screen and keyboard on the PC monitor This feature makes the entire system very easy to use The software proce
31. nitoring Probe Data Gps Data PIN DIE ki gt A 4954 145 SIN A10 F002 PATATE Prd 21 07 10 i Long 12 28 35 624 Cat 2W0710 Date 24 08 10 UTC Typ Electric Field HF 14 49 00 UTC r Fra 100KHz 6 5GHZ Fig 7 10 7 6 3 Plot section This section allows access to a chart Fig 7 11 related to the sequence selected in the monitoring data section below the Monitoring label Here the controls are placed on the left vertical bar e Y Scale this function allows the user to pass from a linear Lin field value scale to a logarithmic Log one except for temperature always displayed using linear scale in case of logarithmic scale the 0 dB value is dynamically assigned to the maximum value of the instantaneous isotropic field then every field value follows the formula E dB 20 Logio E Eisomax e Tracks curves related to the ISO A VG X Y Z and temperature T e Marker horizontal markers for maximum Max and minimum Min value for every enabled track e Tools time zoom in time zoom out and Export image functions Export image saves the chart as a bitmap or jpeg image file 39 NHT310 ki Microlink 7 MicroLink software le Meter Data Help uid owe Y MF CE gt snapshots Monitoring Plot Y Scale un 109 Vim Tracks El AvG Mx My val a M Max E Min 10018 16 52 55 24 08 10 16 52
32. nno esr ili iolanda eas at al ee iii e ea 37 03 Plot O E A E 39 7 7 Exporting data to Microsoft Office Excel Export 41 7 Remote controlor NHT IO unit Remote aa A ET 42 e GPS ANG FOU Ole MADS ataia aa a ab ao O aa ai 42 7 10 Firmware update of NHT310 unit Fw Update 44 III NHT310 1 1 1 1 2 1 3 1 General information GENERAL INFORMATION Applications Human exposure to electromagnetic fields not ionizing radiation is nowadays a critical subject that all countries must address Technical and normative bodies work alongside government institutions to enact new guidelines and norms regarding maximum permitted exposure levels for populations and workers Measurement equipment for this type of analysis must comply with the technical requirements from industry guidelines and must provide the user with appropriate indications for comparison with legally required thresholds About the instrument The NHT 310 is a new Microrad solution for the measurement and analysis of of electromagnetic field EMF safety applications This portable and compact instrument operates in the widest possible frequency bands for a handheld unit The NHT 310 1s user friendly and provides very reliable measurements it also provides the user with the temperature reading of the surrounding environment as well as the GPS coordinates of the site being measured both of which can be included in the user s
33. nstance repairing or setting Storage After the material contained in the packages has been inspected and verified for damages it should be kept stored in its original packing until the time of installation The storage deposit must be well protected and free from humidity Avoid keeping the material in storage for a long time since this may cause some failures during the initial period of utilisation If the instrument should be kept in storage for a long time it is advisable to insert hygroscopic substances such as silicon gel salts in the package Connecting the probe The probe is equipped with a LEMO Push Pull connector To connect it to the NHT310 unit push the probe plug straight down into the probe socket until it clicks into place the red mark on the probe plug must point towards the red mark on the unit socket To disconnect the probe slide the sleeve on the probe plug upwards and pull the probe upwards to remove it Probe Sleeve NHT310 5 4 5 Preparation for use Power supply NHT310 can operate both powered by NiMh rechargeable batteries included as standard and alkaline dry batteries 4 x AA The battery charger must be used to recharge the rechargeable batteries provided as standard During the recharging cycle the system cannot be powered up and therefore cannot be used for measuring Batteries are normally delivered fully charged but may require a complete charge before first time oper
34. r s hand The shell of the meter is made from magnesium and may therefore conduct heat from the user s hand thus influencing the temperature value being measured NHT310 1 General information 1 6 Items included The standard NHT310 unit 1s delivered with the following components NHT310 basic unit for measuring storing and display field data Fiber optic cable 10 meters length Fiber USB adapter to link fiber optic to PC USB A B adapter cable Battery charger Rechargeable battery 4xAA MicroLink software available from www microrad it In order to function correctly the NHT310 meter must be connected to a measurement probe from the Microrad range NHT310 1 General information 1 7 Technical specifications 1 7 1 NHT310 unit specifications PROBE TYPES a nn DO to 40GHz with different E and BIH probes DISPLAY spay o Display size MEASUREMENT FUNCTIONS S From 0 0001 up to 999999 depending on probe and selected unit Actual ACT Maximum MAX Average AVG Median o Ban moving average processed by PC sofware storage Move INTERFACES 21 504 8 monitoring sequences 432 snapshots Optical interface Serial full duplex Probe interface Plug and play auto detection LEMO connector Analogue interfaces 3 separate outputs X Y Z SMA connectors GENERAL SPECIFICATIONS I Approx 72 hours backlight off Charging time 4 hours 100 66 33 lt 10 Temperature range Operating 10
35. red using the monitoring function Each row contains a stored value te MicroLink File Meter Data Help it g ew SnapShots Monitoring plot e280 Start 16 48 55 24 08 10 Tsample 5s UserStop Yes Avg2 h Min 0 05V m Median n a 0 Stop 16 59 30 24 08 10 Nsample 128 FilterStat Off Tava 360s Max 1 18 Vim AvaMax 0 31 V m Nr Time X V m Y V m Z V m Iso V m Avg V m Temp C 73 24 08 10 16 54 55 0 07 0 01 0 05 009 0 13 Tavg 360s 30 6 a 74 24 08 10 16 55 00 0 06 0 00 0 04 0 07 0 13 Tavg 360s 30 6 75 24 08 10 16 55 05 0 05 0 00 0 04 0 06 0 13 Tavg 360s 30 6 76 24 08 10 16 55 10 0 04 0 00 0 05 0 07 0 13 Tavg 360s 30 6 77 24 08 10 16 55 15 0 05 0 00 0 04 0 07 0 13 Tavg 360s Si od 78 24 08 10 16 55 20 0 05 0 00 0 05 0 06 0 12 Tavg 360s 30 5 79 24 08 10 16 55 25 0 05 0 00 0 04 0 06 0 08 Tavg 360s 30 5 80 24 08 10 16 55 30 0 05 0 00 0 05 0 07 0 08 Tavg 360s 30 5 81 24 08 10 16 55 35 0 04 L 0 00 0 05 L 0 06 0 08 Tavg 360s 30 5 82 24 08 10 16 55 40 0 04 0 00 0 06 0 08 0 08 Tavg 360s 30 5 83 24 08 10 16 55 45 0 05 0 01 0 05 0 07 _0 08 Tavg 360s i 30 5 84 24 08 10 16 55 50 0 05 L 0 01 0 05 0 07 0 08 Tav
36. s to the field being tested In remoting mode it is possible to configure several parameters 7 2 Software installation MicroLink runs on Windows XP Windows Vista Windows 7 Windows 8 32 e 64 bit This software is available for download from www microrad it Clicking on the exe setup file the software is installed on the PC During the installation process the drivers for USB Optical adapter are also installed to enable the recognition of the USB Optical adapter each time it is connected to the PC The installation process takes a few minutes At the end of the installation a new MicroLink icon will automatically be created on the desktop and Window menu 30 NHT310 7 3 7 MicroLink software Main screen MicroLink File Meter Data Help TA ben Fur eo MICR RAD No File Loaded No Device Fig 7 1 The program functions are included in the menu bar located on the upper part of the screen as follows File Open Save Properties Exit Meter Download Settings Remoting Fw Update Data Export Units Print Help Contents About All mentioned functions are also easily accessible through the icons located just under the menu bar except for the Fw Update and Exit functions When the NHT310 unit is not connected to the PC a No Device message appears in the lower right corner of the screen When connecting to the NHT310 and trying to establish com
37. sses the measured values in real time and simultaneously shows in graphic form the Amplitude vs Time curve of the field being analysed In remote mode it is possible to store single values or to start and stop monitoring sequence events 1 34 Downloading data from NHT310 to PC using MicroLink software All measurements taken recorded both as a single stored acquisitions punctual and as a long term monitoring event must be downloaded to an external PC through fibre optic cable and MicroLink software in order to be viewed and analysed The software allows the user to view the acquired data in numeric and tabular format and presents the information graphically in a signal vs time context which can utilise a zoom function for obtaining more detailed information of the area of interest NHT310 1 4 1 5 1 General information The data tables can be saved in MS Excel format while the data charts can be saved in jpeg or bitmap format files In addition it is possible to send configuring parameters to NHT310 unit for setting the acoustic alarm level setting the sampling time in long term monitoring setting the time interval for calculating the AVG value with high frequency probes 6 minutes as default value in accordance with International Laws setting date and time Furthermore MicroLink software enables the processing of a 24h moving average for this kind of processing the monitoring sequence must obviously exceed a one day period
38. te The NHT 310 firmware can be upgrade simply by using the MicroLink software to install the upgrade which can be downloaded from the microrad website NHT 310 customers are informed via e mail when the latest firmware updates are released The file including a new firmware release has a suffix rom and it can be received by email or downloaded from manufacturer s website www microrad it The following steps are necessary to start the update NHT310 unit preparation e connect the NHT310 unit which is powered down to the PC through fibre optic cable Press the RESET AVG key and while holding it down then press the ON OFF POWER ON key e Release the ON OFF POWER ON key while holding down the RESET AVG key until the following message appears on the screen FIRMWARE UPGRADE MODE Release the RESET AVG key e MicroLink Software after configuring the unit in update mode and starting the MicroLink programme click on Meter and Fw Update e A window opens and the unit is ready to load the updated file this file rom must be stored on a PC driver unit in advance e Click on the update file rom and automatically starts the update procedure it should last approximately 30 seconds When the procedure is completed a MicroLink message informs the user that the update of the NHT310 is complete and the unit automatically reboots 44
39. to the waste disposal ordinances applicable in your country 4 Insert new batteries Make sure they are inserted correctly following the instructions in the diagram located within the battery compartment 5 Securely close the battery compartment 19 NHT310 7 MicroLink software 6 OPERATION 6 1 Switching on Press POWER ON key Tab 4 1 The instrument starts an auto test cycle and displays partial device data Fig 6 1 shows the first screen displayed at power on reporting the identification data of the instrument gt PzH HT 516H 2hL SH Man yr 3 gt Pra 1090 15 Fig 6 1 1 P N NHT310 Part Number 2 S N NHT310 Serial Number 3 Prd NHT310 production date 4 Fw Firmware version running on the instrument Fig 6 2 shows the second screen displayed after the power on reporting memory status information and the setting of some parameters 20 NHT310 7 MicroLink software 5 gt Snaps Hsy45iz eo Monit 29192 hk 7 gt Tsame JE so gt Tau abs Fig 6 2 5 Snaps Number of single measurements stored in the NHT310 internal memory 6 Monit Residual recording time for the monitoring function updated according to the monitoring sample time parameter Tsamp 7 Tsamp Sample time parameter at the moment set for the monitoring function 8 T
40. ty requirements for electrical equipment for measurement control and laboratory use CEI EN 61010 General requirements NHT310 1 General information 2 SAFETY SUMMARY 2 1 2 2 Foreword The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions or with specific WARNINGS elsewhere in this manual may impair the protection provided by the equipment Such noncompliance would also violate safety standards of design manufacture and intended use of the instrument Correct use e Keep away from live circuits Operators must not remove instrument covers Component replacement and internal adjustments must be made by qualified maintenance personnel Do not replace components with the power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power and discharge circuits before touching them e DO NOT substitute parts or modify instrument To avoid the danger of introducing additional hazards do not install substitute parts or perform unauthorized modifications to the instrument Return the instrument to Microrad Service Center for service and repair to ensure that safety features are maintained in operational condition NHT310 1 General information 3 CERTIFICATION AND WARRANTY 3 1 3 2 3 3 Certification Microrad c
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