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Field Finder

Field Finder

2

© Enviromentor AB 1998 reg. 98.011/Eng

© Copyright Enviromentor AB 1998

The contents of this manual may not be copied or duplicated

without the permission of  Enviromentor AB.

Contents

1

 Introduction ............................... 3

2

Technical data............................. 5

CE assurance ..............................................5
Traceability .................................................6

3

Use ............................................. 7

3.1 Measuring magnetic fields ..........................7
3.2 Measuring electric fields .............................7
3.3 Audible signal .............................................7
3.4 Threshold level ...........................................8
3.5 Changing the batteries .................................8

4

Measurement examples .............. 9

4.1 Electric fields ..............................................9
4.2 Magnetic fields ..........................................10
4.3 Example of report form for measuring

magnetic fields ..........................................12

5

How magnetic fields arise ......... 14

6

How electric fields arise ............ 15

7

References to authorities and

organisations ............................ 16

8

Report forms ............................. 17

Report form A for measuring electric fields in

a room ......................................................18

Report form for measuring electric fields

around an object .......................................20

Report form for measuring magnetic fields

around an object .......................................21

Notes............................................... 22

Notes

Summary of Contents for EnviroMentor Field Finder

Page 1: ...lmers Institute of Technology in G teborg EnviroMentor AB is wholly owned by Radians Innova AB a company which in turn is owned by two of Sweden s most powerful financial institutions This combination...

Page 2: ...fields 7 3 3 Audible signal 7 3 4 Threshold level 8 3 5 Changing the batteries 8 4 Measurement examples 9 4 1 Electric fields 9 4 2 Magnetic fields 10 4 3 Example of report form for measuring magnetic...

Page 3: ...nstrument emits an audible signal that is pro portional to the field strength measured Field Finder measures the electric field in the direction of the measurement surface on the instrument s front sh...

Page 4: ...r does not satisfy the requirements of MPR II but the instrument has been calibrated to produce the same results when measuring electric fields at a distance of 50 cm from a VDU Some measurement objec...

Page 5: ...icroprocessor 10 bit A D converter three dimensional sensor CE assurance Our product satisfies the demands of the Low Voltage and EMC directive as well as the follo wing EMC standards EN 50 081 1 1992...

Page 6: ...eability Traceability means that it should be possible to relate a measurement result to national or inter national standards via an unbroken chain of comparisons Report form B for measuring electric...

Page 7: ...e influenced by objects in the vicinity of the instrument as well as by the person holding it The instrument has to be held still in order to achieve a stable value When me asuring electric fields fro...

Page 8: ...the old batte ries and install new ones 2 x 1 5 V LR6 8 Report forms On the following pages you will find report form templates for measuring electric and magnetic fields Copy the templates fill them...

Page 9: ...e at a time and measure the electric fields in the directions 0 90 180 and 270 at distances of 30 cm and 50 cm from the outer edge of the piece of apparatus in question see figure or in the direction...

Page 10: ...tentials If two plates made of electri cally conductive material are connected to a voltage source one of the plates will have a positive charge while the other will have a negative charge A vol tage...

Page 11: ...he conductor Magnetic fields are usually depicted with the aid of field lines The strength of the magnetic field is constant along the conductor in closed paths around the live conductor In the event...

Page 12: ...asuring equipment Field Finder Object Model Address Room Measured by Date 30 cm 50 cm Comments 0 V m V m 90 V m V m 180 V m V m 270 V m V m Background field V m V m Notes Report 98 2 Field Finder Envi...

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