ETS-Lindgren HI-3627 User Manual
HI-3627
ELF Magnetic Field Meter
User's Manual
Copyright © 1992 Holaday Ind. Inc.
Manual #600047 10/97 $8.50
Revision Record
Manual #600047
HI-3627 ELF Meter
Revision Description Date
Preliminary Release 5/92
--- Release 6/92
A Added CE Label 10/97
TABLE OF CONTENTS
1.0 Description ........................ 1
2.0 Specifications ....................... 3
3.0 Operation ......................... 5
Introduction .................... 5
Quick Start .................... 5
Controls, Indicators and Connectors ... 5
Recorder Output ................. 7
Low Battery Indication ............. 8
Recharging ..................... 9
4.0 Making Measurements ................ 11
5.0 Example Applications ................ 13
Mapping Power Lines ............. 13
Locating and Mapping Underground
Cables ....................... 14
VDTs ....................... 14
Residential Measurement Surveys .... 15
Residential Ground Currents ........ 17
Ground Faults .................. 17
Pipe Inspections ................ 18
Site Surveys ................... 18
6.0 Maintenance ...................... 19
Battery Replacement ............. 19
7.0 Principle of Operation ................ 21
Probe ....................... 21
Input Signal Conditioning .......... 21
Filter Section .................. 21
RMS Circuitry .................. 23
Information Processing ............ 23
Power supply .................. 23
8.0 Calibration ........................ 25
9.0 References ........................ 27
LIMITED WARRANTY
HOLADAY INDUSTRIES, INC. WARRANTS EACH MODEL HI-3627 3AXIS ELF MAGNETIC FIELD METER BE FREE FROM DEFECTS IN
MATERIAL AND WORKMANSHIP FOR A PERIOD OF ONE YEAR FROM
DATE OF SHIPMENT TO THE PURCHASER. THIS WARRANTY
EXTENDS TO THE ORIGINAL PURCHASER ONLY AND DOES NOT
APPLY TO BATTERIES OR ANY PRODUCT OR PARTS SUBJECT TO
MISUSE, NEGLECT, ACCIDENT, UNAUTHORIZED SERVICE OR
ABNORMAL CONDITIONS OF OPERATION.
IN THE EVENT OF INSTRUMENT FAILURE COVERED BY THIS
WARRANTY, HOLADAY INDUSTRIES, INC. WILL, WITHOUT CHARGE,
REPAIR AND RECALIBRATE THE INSTRUMENT IF RETURNED TO THEIR
FACTORY WITHIN ONE YEAR OF THE ORIGINAL PURCHASE,
PROVIDED THAT HOLADAY INDUSTRIES' EXAMINATION DISCLOSES
TO ITS SATISFACTION THAT THE PRODUCT WAS DEFECTIVE.
HOLADAY INDUSTRIES, INC. MAY, AT ITS OPTION, REPLACE THE
PRODUCT IN LIEU OF REPAIR. IF THE DEFECT WAS CAUSED BY
MISUSE, NEGLECT, ACCIDENT, UNAUTHORIZED SERVICE OR
ABNORMAL CONDITIONS OF OPERATIONS, REPAIRS WILL BE BILLED
AT A NOMINAL COST. IN SUCH CASE, AN ESTIMATE WILL BE
PROVIDED BEFORE WORK IS STARTED IF REQUESTED BY THE
PURCHASER.
FOR WARRANTY SERVICE, CONTACT HOLADAY INDUSTRIES, INC.
GIVING FULL DETAILS OF THE FAILURE AND THE SERIAL NUMBER OF
THE INSTRUMENT. YOU WILL THEN BE GIVEN SERVICE INFORMATION
OR SHIPPING INSTRUCTIONS. RETURN THE INSTRUMENT TO THE
FACTORY TRANSPORTATION PREPAID. REPAIRS WILL BE MADE AT
THE FACTORY AND THE INSTRUMENT RETURNED TO YOU
TRANSPORTATION PAID. HOLADAY INDUSTRIES, INC. ASSUMES NO
RESPONSIBILITY FOR LOSS OF, OR DAMAGE TO, PRODUCTS IN
TRANSIT.
WARNING
SPECIAL CAUTION 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 POWER LINES. ACCIDENTAL
CONTACT WITH OBJECTS OR CIRCUITS OPERATED AT HIGH
VOLTAGES OR HIGH CURRENTS CAN BE LETHAL! HOLADAY
INDUSTRIES, INC. ASSUMES NO LIABILITY FOR DAMAGES OR
PERSONAL INJURY WHICH MAY RESULT FROM ACCIDENTS ARISING
OUT OF USE OF THIS EQUIPMENT.
HI-3627 Manual Page --1
1.0 Description
The HI-3627 ELF Magnetic Field Meter is designed to measure
the flux density of magnetic fields in the frequency range of 5
Hz to 2 kHz. This conforms with recent measurement guidelines
issued in Sweden for extremely-low-frequency (ELF) magnetic
fields produced by video display terminals (VDTs). The HI-3627
finds application in the measurement of magnetic fields
associated with electric power lines, electrically operated
appliances and VDTs.
The HI-3627 is a three axis flux density meter designed to be
responsive to either sinusoidal or complex magnetic field
waveforms such as produced by the vertical deflection systems
of VDTs. It computes the root-mean-square (RMS) value of
magnetic flux density and directly displays it on an analog
meter. The sensor consists of three multiturn loops connected
to the instrumentation readout package via a 1.2 meter long
cable. The microprocessor in 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 immune to most electric field effects. No
interference is caused by ambient electric fields such as might
be found beneath high voltage, overhead electric power lines or
nearby radio or television stations.
The HI-3627 has a wide dynamic measurement range. This
provides for readings from 0.2 milligauss to 20 gauss. This large
dynamic range makes the HI-3627 convenient for measurement
of ambient residential magnetic fields as well as high level fields
found near high current carrying conductors or electrical
machinery.
Page -- 2 HI-3627 Manual
HI-3627 Manual Page --3
2.0 Specifications
Frequency Response:
30* Hz - 3 dB
2000 Hz - 3 dB
< 30* Hz Falling 80 dB/decade
> 2000 Hz Falling 40 dB/decade
* (Note: The frequency response is switchable to 5 Hz)
Sensor:
External, three axis multi-turn loop, with inside
diameter of 110 mm and outside diameter of 116 mm;
loop area 0.010 m2. Cable length is 1.2 meters.
Detector Response:
True RMS field indication for accurate measurement of
non-sinusoidal waveforms.
Figure 2-1
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