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ETS-Lindgren HI-3627, User Manual

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ETS-Lindgren HI-3627 User Manual Download Page 33

 

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Calibration

 

33 

 

8.0   Calibration 

The HI-3627 is calibrated using a one meter diameter Helmholtz coil. 
Each axis is individually calibrated. Calibration is performed at 60 Hz at 
levels of 100 mG, 1 G, and 10 G. All calibrations are traceable to NIST. 
The frequency response of each axis is checked in all meters.  

The recommended recalibration interval is one year. ETS-Lindgren 
offers complete recalibration services which comply with MIL-STD 
45662A. 

 

 

 

Summary of Contents for HI-3627

Page 1: ...ets lindgren com Introduction 1 HI 3627 ELF Magnetic Field Meter User Manual ...

Page 2: ...nor the rights of others All trademarks are the property of their respective owners Copyright 1992 2016 by ETS Lindgren Inc All Rights Reserved No part of this document may be copied by any means without written permission from ETS Lindgren Inc Trademarks used in this document The ETS Lindgren logo is a registered trademark of ETS Lindgren Inc Revision Record HI 3627 MANUAL Elf Magnetic Field Mete...

Page 3: ... and Connectors 17 Recorder Output 18 Low Battery Indication 20 Recharging 20 5 0 Making Measurements 21 6 0 Example Applications of the HI 3627 23 Mapping Power Lines 23 Locating and Mapping Underground Cables 24 Residential Measurements Surveys 24 Residential Ground Currents 26 Ground Faults 26 Pipe Inspections 26 7 0 Principle of Operation 29 Probe 29 Input Signal Conditioning 29 Filter Section...

Page 4: ...4 Introduction ets lindgren com 9 0 References 35 Appendix A Warranty 37 Duration of Warranties 37 Appendix B EC Declaration of Conformity 39 ...

Page 5: ...ets lindgren com Introduction 5 This page intentionally left blank ...

Page 6: ... text gives proper procedures Note See the ETS Lindgren Product Information Bulletin for safety regulatory and other product marking information Safety Information Refer to Manual When product is marked with this symbol see the instruction manual for additional information If the instruction manual has been misplaced download it from www ets lindgren com or contact ETS Lindgren Customer Service Hi...

Page 7: ...ste Electrical and Electronic Equipment WEEE Directive European Union At end of useful life this product should be deposited at an appropriate waste disposal facility for recycling and disposal Do not dispose of with household waste Recyclable Products This product includes rechargeable batteries At end of useful life please recycle the used batteries or dispose of them safely and properly Many ci...

Page 8: ...8 Introduction ets lindgren com This page intentionally left blank ...

Page 9: ...the meter continually computes the magnitude of the field independent of the probe orientation This allows quick assessment of the actual flux density value while conveniently holding the instrument for easy meter reading This feature makes the HI 3627 especially useful for rapid large area surveys of magnetic fields The field sensor is electrically shielded making the response of the HI 3627 immu...

Page 10: ...gren Product Information Bulletin included with your shipment for the following Warranty information Safety regulatory and other product marking information Steps to receive your shipment Steps to return a component for service ETS Lindgren calibration service ETS Lindgren contact information ...

Page 11: ...ce Battery Replacement The battery pack used in the HI 3627 Magnetic Field meter is a commonly available NiCad battery pack ETS Lindgren part number H 491044 9 6 volt 600 mAH or equivalent In the event of battery failure a new battery can be obtained from ETS Lindgren or from a local source To replace the battery pack 1 Remove back cover of the meter Back cover is fastened by six screws that can b...

Page 12: ... ETS LINDGREN Note Please see www ets lindgren com for a list of ETS Lindgren offices including phone and email contact information SENDING A COMPONENT FOR SERVICE For the steps to return a system or system component to ETS Lindgren for service see the Product Information Bulletin included with your shipment CALIBRATION SERVICES AND ANNUAL CALIBRATION See the Product Information Bulletin included ...

Page 13: ...ons 13 3 0 Specifications Frequency Response 30 Hz 3 dB see note 2000 Hz 3 dB 30 Hz Falling 80 dB decade see note 2000 Hz Falling 40 dB decade Note The frequency response is switchable to 5 Hz Figure 3 1 Typical Frequency Response ...

Page 14: ... length is 1 2 meters Detector Response True RMS field indication for accurate measurement of non sinusoidal waveforms Sensitivity Full scale ranges of 2 mG 20 mG 200 mG 2 G 20 G Accuracy 5 at calibration frequency Power One 9 6 volt NiCad battery Battery Life Approximately 30 Hrs continuous operation new battery with a full charge Linearity see note 2 Full Scale ...

Page 15: ...sinusoidal current is driven through the Helmholtz coils and based on the dimensions of the coils the magnetic field flux density between the coils is calculated While the HI 3627 indicates magnetic flux density B in units of milligauss the flux density in microtesla or magnetic field strength H in milliamperes per meter may be obtained via the following relations 1 mG 1 microtesla μT 1 mG 80 mill...

Page 16: ...16 Specifications ets lindgren com This page intentionally left blank ...

Page 17: ...ion clockwise Note the battery low LED will flash momentarily as the meter is turned on Step 3 Verify that the over range LED and the battery LED are not illuminated Step 4 Make measurements with the range selector switch set for the maximum reading without an over range indication Controls Indicators and Connectors The HI 3627 is housed in a rugged aluminum case with a detachable probe The unit i...

Page 18: ...Magnetic Field Meter has a recorder output The recorder output is a voltage signal 0 5 VDC proportional to the needle deflection on the meter This output can be used to drive a chart recorder data logger or other device to display the indicated field reading on the instrument ...

Page 19: ...n the battery charging circuit keeps the battery voltage from being applied to the recorder output when a plug is inserted into the jack The recorder output comes directly from the circuit driving the meter movement The maximum current available to the recorder output jack is 1 milliampere 5000 ohm minimum recorder output load A lower impedance recorder output load will affect the accuracy of both...

Page 20: ...harged and then dropping very rapidly Recharging Recharge the battery with the standard trickle charger P N H 491063 02 Recharging a fully discharged unit will take 15 hours to complete The standard charger provided with the HI 3627 is a trickle charger It works by charging the battery with relatively low current The charger can be left connected to the meter indefinitely without causing severe da...

Page 21: ...ned by taking three orthogonal measurements of the field In this case the sensor has three separate coils oriented in three mutually perpendicular directions around a fixed point The resultant flux density is then found by calculating the root sum squared value from the individual RMS readings for each axis For area surveys of ELF fields the 30 Hz cutoff will be more useful When the 5 Hz frequency...

Page 22: ...22 Making Measurements ets lindgren com This page intentionally left blank ...

Page 23: ...ses perpendicular to the power line Generally readings are first taken along the length of a span of the power line to identify the point at which the greatest flux density exists Then at this point take the readings perpendicular to the power line Take readings every five to ten feet A magnetic field flux density profile can then be developed This method is outlined by the Institute of Electrical...

Page 24: ...uring the flux density produced by buried lines In this case the area must be explored by walking about with the meter until the region of maximum flux density is found Then as in mapping power lines you would make straight line passes perpendicular to the buried cable recording readings at fixed intervals Residential Measurements Surveys Magnetic fields found in home environments are highly varia...

Page 25: ... flux density value at intervals of a few inches or centimeters beginning near the surface of the device These data will help provide a perspective on the spatial extent of the elevated field levels and the significance of the levels relative to other values determined elsewhere within the home Field measurements should take into account the likelihood that individuals may have access to areas whe...

Page 26: ...it is possible to measure magnetic flux densities within the home even though the power to the home has been shut off Ground Faults As mentioned earlier current can exist in pipes and heating ducts or anything metal in the house This gives rise to an interesting application for the HI 3627 detecting leakage currents from appliances For example it was noted that the fields around a water pipe leadi...

Page 27: ... single operator with very little equipment could inspect a large section of pipe for possible failures in a very short period of time This of course is a singular example that only worked because of very unusual circumstances but it does show the versatility of this easy to use field meter ...

Page 28: ...28 Example Applications of the HI 3627 ets lindgren com This page intentionally left blank ...

Page 29: ...o the coil shield common point Input Signal Conditioning The output voltage of a coil varies with the frequency of the applied magnetic field A single pole low pass filter is added to the output of each coil to flatten the frequency response and provide impedance matching The input signals are then passed through a programmable gain amplifier stage that provides the necessary amplification for the...

Page 30: ...30 Principle of Operation ets lindgren com Figure 7 1 ...

Page 31: ...ms an A D conversion on the signal from each axis by programming an analog multiplexer into a 12 bit A D converter The digital values are then squared summed and the square root of the sum is calculated This result is used to set the duty cycle of the PWM output which drives the meter movement The output frequency of the PWM is about 30 Hz This frequency is too high to show on the analog meter but...

Page 32: ...32 Principle of Operation ets lindgren com This page intentionally left blank ...

Page 33: ...s individually calibrated Calibration is performed at 60 Hz at levels of 100 mG 1 G and 10 G All calibrations are traceable to NIST The frequency response of each axis is checked in all meters The recommended recalibration interval is one year ETS Lindgren offers complete recalibration services which comply with MIL STD 45662A ...

Page 34: ...34 Calibration ets lindgren com This page intentionally left blank ...

Page 35: ...r 17 1986 2 Swedish National Board for Measurement and Testing Test Methods for Visual Display Units Visual Ergonomics and Emission Characteristics MPR 1990 8 1990 12 01 National Board for Measurement and Testing Box 878 S 501 15 Bors Sweden 3 Electric and Magnetic Field Measurements and Possible Effects on Human Health from Appliances Power Lines and Other Common Sources Special Epidemiological S...

Page 36: ...36 References ets lindgren com This page intentionally left blank ...

Page 37: ...IS ADVISED WHEN WORKING IN ENVIRONMENTS WHERE CONTACT WITH HIGH VOLTAGE OR HIGH CURRENT CIRCUITS OR APPARATUS IS POSSIBLE THIS IS PARTICULARLY TRUE WHEN ATTEMPTING TO OBTAIN ELECTRIC OR MAGNETIC FIELD STRENGTH MEASUREMENTS IN CONFINED QUARTERS FOR EXAMPLE INSIDE CABINETS CONTAINING ELECTRICALLY OPERATED EQUIPMENT ELECTRIC POWER SUBSTATIONS OR IN VERY CLOSE PROXIMITY TO THE CONDUCTORS OF ENERGIZED ...

Page 38: ...38 Warranty ets lindgren com This page intentionally left blank ...

Page 39: ... kHz to which this declaration relates in conformity with the following European harmonized and published standards at date of this declaration Standard s EN 61326 1 2013 Electrical Equipment for Measurement Control and Laboratory use emc Requirements Part 1 General Requirements EN 61010 1 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Directive s Low Volta...

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