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Related Manuals for Microrad NHT-310
Summary of Contents for Microrad NHT-310
- Page 1 NHT-310 User Manual...
- Page 2 Design development and manufacturing MICRORAD P.zza delle Azalee 13/14 05019 Orvieto (TR) – ITALIA Tel +39 0763393291 Fax +39 0763394423 email info@microrad.it www.microrad.it Release 2.5 June 2017...
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Page 3: Table Of Contents
INDEX GENERAL INFORMATION ....................1 Application ........................1 About the instrument ..................... 1 Operating modes ......................1 1.3.1 Single EMF measurement ..................1 1.3.2 Long-term Monitoring ................... 2 1.3.3 NHT310 remote control through MicroLink software ..........2 1.3.4 Downloading data to PC ..................2 Measurement probes .................... - Page 4 MICROLINK SOFTWARE ....................28 Description ........................28 Software installation ....................28 Software main screen ....................28 Functions ........................29 NHT310 parameters setting (Settings) ................ 30 Download data from NHT310 (Download) ..............32 7.6.1 SnapShots panel ....................33 7.6.2 Monitoring panel ....................34 7.6.3 Monitoring data graphic format ................
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Page 5: General Information
1.2 About the instrument NHT310 is the new Microrad solution for the measurement of electromagnetic fields. Besides being handy and compact, the instrument operates in the widest frequency band possible for a handheld instrument. -
Page 6: Long-Term Monitoring
NHT310 1. General information measurements (for a total of 432 measurements) along with the information regarding date and time, GPS coordinates, and ambient temperature. 1.3.2 Long-term Monitoring NHT310 can perform up to 8 data acquisition sequences for long-term monitoring of broadband electromagnetic fields. This mode is particularly useful for low frequency magnetic induction measurements, since it is possible to follow the possible fluctuation of field values depending on the daily variation of the current flow in the electric lines or in the transformation cabins... -
Page 7: Measurement Probes
NHT310 1. General information Data export in tabular format (Excel compatible) and graphics, jpeg or bitmap format, is also possible. Using MicroLink software, the user can send configuration data to the device in order to set the threshold for a high field acoustic alarm, set the sampling interval between an acquisition and the next in long-term monitoring, set the time interval to calculate the moving average with high frequency probes (default value is 6 minutes as per international regulations), set the date and... -
Page 8: Equipment Configuration
Battery charger Rechargeable batteries Sturdy carrying case with IP67 protection class MicroLink software and user manual (available on www.microrad.it) ISO 9001:2008 calibration certificates In order to work correctly, the NHT310 meter must be connected to a measurement probe from those available for this model. -
Page 9: Nht310 Technical Specifications
NHT310 1. General information 1.7 NHT310 technical specifications 1.7.1 NHT310 base unit PROBE TYPE Frequency range From DC to 18GHz using several B, E, H probes DISPLAY Type Transflective LCD monochrome COG (chip on glass) Size 7 cm , 128x64 dots Backlight Electroluminescent screen 10s/continuous selectable MEASUREMENT FUNCTIONS... -
Page 10: Measurement Probes
NHT310 1. General information 1.7.2 Measurement probes Radio-frequency probes P/N Probe Frequency range 100 kHz - 6.5 GHz 400 kHz - 30 MHz 300 kHz - 30MHz 100k Hz - 18GHz 3 MHz - 40GHz Frequency Response Flat Flat Flat Flat Flat Measurement range... -
Page 11: Standard Compliance
NHT310 1. General information 1.8 Standard compliance Electrical equipment for measurement, control and laboratory use. EMC requirements: radiating emission, ESD e EMC CEI EN 61326 radiating immunity in radio frequency, electrostatic discharge. Safety requirements for electrical equipment for measurement, control and laboratory use – General SAFETY CEI EN 61010 requirements. -
Page 12: Safety Instructions
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. -
Page 13: Certification And Warranty
3.1 Certification Microrad certifies that this product met its published specifications at the time of shipment from the factory. Microrad also certifies that each probe for the NHT310 instrument has been calibrated according to DIN EN ISO 9001: 2008. On request, SIT certification is available, covering magnetic and electric field strength and high frequency electromagnetic power density, and OKD certification for magnetic induction intensity and low frequency electric field. -
Page 14: Unit Description
UNIT DESCRIPTION 4.1 Front panel legend The following table refers to Figure 4.1 which shows the keyboard and the main parts on the NHT310 base unit front panel. Some keys have a second function, indicated in blue, which can be enabled by pushing the middle button SHIFT in advance. - Page 15 NHT310 4. Unit description Item Name Function GPS Antenna Probes Input connector Battery charge input Backlit display Temperature sensor MODE key UNIT: changes the field measurement unit. Pressing the button for 10 seconds it is possible to change the temperature unit from ° C to ° F and vice versa.
- Page 16 NHT310 4. Unit description POWER key ON / OFF: Switching the device on / off. GPS key ON / OFF: enables / disables the GPS receiver. Blue LED indicating battery recharge. RESET key AVG: reset of time average value. If pressed for more than 10 seconds performs a reset of the instrument, reinitializing...
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Page 17: Connectors And Interfaces Legend
NHT310 4. Unit description 4.2 Connectors and interfaces legend The tables below refer to connectors and interfaces available on the back and at the top of the base unit. Fig. 4.2 – Rear View Item Name Function Fiber optic cable interface for connection to a FIBER remote PC/Tablet Tab. - Page 18 NHT310 4. Unit description Fig. 4.3 – Top view Item Name Function BARREL JACK Battery charge input LEMO Probes Input connector GPS Antenna Tab. 4.3 – Top interfaces...
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Page 19: Preparation For Use
As soon as the instrument arrives at its destination, please carefully check the packages to verify possible damages caused by shipment. If any damage is found, inform Microrad immediately. It is recommended to keep the original packages for a future return shipment due to, for instance, repairing or resetting. -
Page 20: Power Supply
NHT310 5. Preparation for use 5.4 Power supply NHT310 operates both with NiMh rechargeable batteries (supplied) and with alkaline dry batteries (4 x AA stylus). The battery charger delivered with the instrument can be used to charge the rechargeable batteries supplied. During the battery recharge cycle, the instrument can not be used for measurements. -
Page 21: Battery Autonomy
NHT310 5. Preparation for use 5.4.1 Battery autonomy The battery discharge time is longer than 72 hours of continuous operation (with backlight turned off and no active GPS). The discharge time of alkaline dry batteries may also be longer than that of rechargeable batteries. -
Page 22: Operation
OPERATION 6.1 Base unit switching on Press [POWER ON] key (Tab. 4.1). The instrument starts an auto test tool and simultaneously displays instrument information. Fig. 6.1 shows the first screen displayed at power up and reports the identification data of the instrument for a few seconds. Fig. - Page 23 NHT310 6. Operation 5 – Snaps. number of single measurements stored in the NHT310 memory. 6 – Monit. Residual recording time for the monitoring function, calculated taking into account the current sampling interval set (Tsamp). 7 – Tsamp. sampling interval used during monitoring. 8 –...
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Page 24: Main Measuring Display Screen
NHT310 6. Operation Fig. 6.4 6.2 Main measuring display screen After the power on operation and probe detection and calibration is completed, the main measure screen appears together with all the other report elements which are also highlighted as shown in figure 6.5. Fig. - Page 25 NHT310 6. Operation 2 – Environmental temperature measured by the integrated sensor on the front part of the unit. The temperature value shown is surely reliable when the unit is working on a tripod and not in the user’s hand. 3 –...
- Page 26 NHT310 6. Operation second order low pass filter (40 dB / decade) with 1kHz cutting frequency is enabled. Its use is useful for analyzing 50Hz sources with their main harmonics, cutting off the influence of higher frequency sources. Figure 6.6 shows the typical filter response diagram.
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Page 27: Recording Measured Value
NHT310 6. Operation 6.3 Recording measured value The user can record the measured values using two different methods: • Manual storing of the single measured value (single storing) • Automatic storing of a measurement sequence (monitoring). The instrument reserves two different memory spaces for the two recording modes. -
Page 28: Monitoring
NHT310 6. Operation 6.3.2 Monitoring The instrument is able to carry out continuous tracking activity over time: practically it performs a sequence of single stores, all spaced from the same time delay. The time interval between a sample storing and the next (sampling step) is by default 5 seconds but it can be reconfigured by the user using the MicroLink software. -
Page 29: Measurement Download And Display
NHT310 6. Operation Fig. 6.10 The measurement unit and the instantaneous isotropic value of the field (ISO) are always displayed underneath the bar. To stop the monitoring before the memory space is exhausted, simply press any key on the instrument. When there are 8 monitoring sequences or 21’504 samples already stored in the NHT310, if a new acquisition sequence is attempted, the display shows a full memory warning (MEMORY FULL) and the monitoring is aborted. -
Page 30: Alert Levels
NHT310 6. Operation This function can be useful to quickly obtain an average value in space when two or more values are captured in different spatial points. Fig. 6.11 Note that the SPT value is also displayed in the standard operating mode, alternating with the ALM alarm threshold display. -
Page 31: Factory Reset
NHT310 6. Operation In the case where the field is so strong that it surpassed the probe range, then the message OVER-RANGE (Fig. 6.13) appears on the screen in place of the isotropic value; the message is always coupled with an acoustic signal. Fig. -
Page 32: Microlink Software
MicroLink software is compatible with Windows XP, Vista, 7, 8, 10 operating systems, both 32 and 64 bits. The installation file can be downloaded from the Microrad website (www.microrad.it) within the software download page. Together with the application, the Optical / USB adapter driver is also installed, enabling automatic adapter recognition each time it is connected to the PC. -
Page 33: Functions
NHT310 7. MicroLink software The program functions can be opened from the upper toolbar menu as follows: File - [Open] [Save] [Properties] [Exit] Meter - [Download] [Settings] [Remoting] [Fw Update] Data - [Export] [Units] [Print] Help - [Contents] [About] For simplicity, all the functions listed above can be accessed directly via the icons located immediately under the menu bar (except the Fw Update and Exit functions). -
Page 34: Nht310 Parameters Setting (Settings)
NHT310 7. MicroLink software Remoting – Remote management of the NHT310 from PC via fiber optic connection. Export – Exports in tabular format (Excel compatible) all the acquisition data. Units – Selecting the default measurement unit for the electric and magnetic fields, and for temperature. Print –... - Page 35 NHT310 7. MicroLink software Fig. 7.2 The possible settings from this panel are illustrated below. RMS Settings User can set the time interval to calculate the AVG (time average) value in the range from 1 second to 192 minutes. Default value is 6 minutes as per international regulations.
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Page 36: Download Data From Nht310 (Download)
NHT310 7. MicroLink software Alarm Settings Allows the user to configure the alarm threshold for high field. • High Frequency Probe: level and measurement unit for use with high frequency electric (E) or magnetic (H) probe; • Low Frequency Magnetic Probe: level and measurement unit for use with static or low frequency magnetic probe;... -
Page 37: Snapshots Panel
NHT310 7. MicroLink software Fig. 7.7 Data saved to files (.uR extension) can also be recalled via the [Open] command. After download or after opening a file, a screen is displayed that allows selection between SnapShots, Monitoring, Plot. 7.6.1 SnapShots panel SnapShots are measures taken in punctual mode. -
Page 38: Monitoring Panel
NHT310 7. MicroLink software Each single measurement (snapshot) is represented by a line in a table which contains the following information: • Progressive number (from 1 to 432). • Date and time. • X, Y, Z instantaneous component values for the field. •... - Page 39 NHT310 7. MicroLink software Fig. 7.9 Eight separate monitoring sequences can be stored, that can be selected by control on top left corner, under the #Monitoring tag. The maximum number of measurements and then lines in the table is 21’504. For each one the following information are displayed: •...
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Page 40: Monitoring Data Graphic Format
NHT310 7. MicroLink software the last data may be disturbed by the operator proximity. As an alternative to manual shutdown, it is possible to stop monitoring by remote control, setting a scheduled stop, or stop for memory depletion. • FilterStart indicator, returns the On / Off status of the instrument low frequency filter during monitoring. - Page 41 NHT310 7. MicroLink software value of 0 dB is assigned to the maximum value of the isometric field; then each point assumes a decibel value according to the relation: E(dB) = 20 Log ( E / E isomax • Tracks: allows the viewing of the [ISO] instant field values, of the individual axes [X], [Y], [Z], of the r.m.s.
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Page 42: Microsoft Excel™ Data Export
NHT310 7. MicroLink software As far as exporting graphics images is concerned, by clicking on the specific icon user can access the image save window as illustrated in Fig.7.13. Fig. 7.13 User can select the .BMP or .JPG file type and choose inverted colors in order to save with a white background for a better print economy. -
Page 43: Nht310 Remote Control
NHT310 7. MicroLink software 7.8 NHT310 remote control After switching on the NHT310 and connecting it to the PC, user can remotely control it by clicking on the [Remoting] command. A double window on the PC monitor will be displayed: on the left the frontal image of the instrument is faithfully reproduced;... - Page 44 NHT310 7. MicroLink software Google Maps which indicates the positions from which the measurements were taken. This is done by establishing a connection between the PC and the internet and then clicking on the [Maps] button which appears in the window as shown in Fig.
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Page 45: Nht310 Firmware Update
The file containing the new firmware version is recognizable through the extension .rom and may be downloaded from the manufacturer website: www.microrad.it To carry out an update the following procedure is used: • Make sure the NHT310 device is switched off before connecting it to the PC via the optical cable supplied with the kit. -
Page 46: Appendix Acommunication Protocol
FTDIChip; the driver allows the software to see the USB line as a normal serial port and establish communication with UART protocol. Driver installation is not required if a PC where Microrad MicroLink software is already present is used. In any case, operator should verify that the VCP option is enabled: Device Manager (Gestione dispositivi) →... - Page 47 NHT310 APPENDIX A. Communication protocol software application, data serial communication mode and VCP option of the driver must be disabled. WARNING! In serial communication mode, the instrument optical transmitter (Class I LED) remains active even if the fiber optic cable is not inserted; although class I optical sources are considered safe for vision, it is advisable however to avoid direct exposure of the eyes to the emitted light.
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