ETS-Lindgren HI-3637 User Manual
HIn3637
VLF Magnetic Field Meter
User's Manual
Copyright © 1993 by Holaday Industries, Inc.
Manual #600055 2/00 $12.50
Revision Record
Manual #600055
HIn3637 VLF Meter
Revision Description Date
--- Release 9/93
A Rev. Spec 4/94
B Added CE Label 10/97
C Update Recorder Output Level 01/00
D Changed Area Code 2/00
TABLE OF CONTENTS
1.0 DESCRIPTION ..................... 1
Introduction ........................ 1
2.0 SPECIFICATIONS ................... 3
3.0 ACCEPTANCE AND CONTROLS ......... 7
Introduction ....................... 7
Unpacking and Acceptance ............ 7
Battery .......................... 7
Battery Charger .................... 7
Controls, Indicators and Connectors ...... 9
Recorder Output ................... 10
Low Battery Indication ............... 11
4.0 BATTERY CHARGING ............... 13
Introduction ...................... 13
Battery Tips ...................... 13
Charging Procedure ................. 14
Charging Considerations ............. 14
Battery Replacement ................ 15
5.0 MAINTENANCE ................... 17
Introduction ...................... 17
Maintenance Recommendations ........ 17
Return Procedures .................. 17
Periodic/Preventive Maintenance ........ 18
Parts Information .................. 19
6.0 MAKING MEASUREMENTS ........... 21
Quick Start ...................... 21
Description ...................... 22
7.0 THEORY OF OPERATION ............. 23
Introduction ...................... 23
Probe .......................... 23
Range Select ..................... 23
Pre-filter Section ................... 23
Integrator Section .................. 25
Post-filter Section .................. 25
RMS Calculation ................... 25
Power supply ..................... 25
8.0 CALIBRATION .................... 27
9.0 REFERENCES ..................... 29
APPENDIX A
VIDEO DISPLAY TERMINALS (VDTs) ......... 31
VDT CHARACTERISTICS .............. 31
General Description .............. 31
Principles of Operation ............ 31
Modulated DC Fields ............ 32
60/50 Hz Fields ............... 33
Deflection System Fields ......... 33
Broadband RF Fields ............ 34
CHARACTERIZING VDT EMISSIONS AND
OPERATOR EXPOSURE .......... 35
Introduction .................. 35
Characterizing VDT Emissions ...... 35
GUIDELINES FOR RF EXPOSURE ........ 37
Limited Warranty
Holaday Industries, Inc. warrants each model HIn3637 3Axis VLF Magnetic Field Meter to be free from defects in
material and workmanship for a period of one year from
the date of shipment to the purchaser. This warranty
extends to the original purchaser only, and does not apply
to the batteries or to any products or parts subject to
misuse, neglect, accident, unauthorized service or
abnormal conditions of operation.
In the event an instrument covered by this warranty fails,
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 is 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 operation, repairs will be billed at a nominal
cost. In such cases, an estimate will be provided before
work is started, if requested by the purchaser.
For warranty service, contact Holaday Industries, Inc.
Provide the serial number of the instrument and complete
details regarding the failure mode. You will then be given
either service information or shipping instructions. Return
the instrument to the factory, transportation prepaid.
Repairs will be made at the factory and the instrument
will be returned to you, transportation prepaid. Holaday
Industries, Inc., assumes no responsibility for loss of, or
damage to, products in transit.
Warning!
EXTREME 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 SUCH AS 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
HIn3637 Manual Page — 1
1.0 DESCRIPTION
Introduction
The HIn3637 VLF (very-low frequency) Magnetic Field
Meter measures magnetic field flux density in the
frequency range of 2 kHz to 400 kHz. The capabilities of
this instrument are designed to conform to the guidelines
issued recently in Sweden—as well as the IEEE P-1140
protocol—for measuring VLF magnetic fields produced by
video display terminals (VDTs). Applications for this
versatile meter range from VDTs and computer monitors
to high current factory locations.
The HIn3637 is a self-contained three-axis flux density
meter designed to respond to either sinusoidal or complex
magnetic field waveforms, such as those produced by the
vertical deflection system of a VDT. The meter circuit
utilizes a microprocessor to continually compute the rootmean-square (RMS) value of magnetic field flux density
and display it directly on an analog meter, allowing quick
assessment of the actual flux density value. The size of
the instrumentation/readout package was chosen for two
reasons. The first is to allow for two layers of electric and
magnetic shielding in addition to the outer housing. The
second is to allow for hand held operation. This
portability makes the HIn3637 particularly useful in
surveying the magnetic field flux density distribution over
a large area in a short amount of time.
The probe sensor array consists of three mutually
orthogonal multi-turn loops connected to the
instrumentation/readout package via a 1.5 meter cable.
Readings are independent of probe orientation. The
probe is electrically shielded, making the HIn3637
immune to most electric field effects.
The HIn3637 has a wide dynamic measurement range:
4 nT to 400 :T (100 dB). This makes the HIn3637
convenient for finding VLF magnetic field distributions in
any application. The supplied alternate panel label
converts the meter scale to Gauss (0.04 mG to 4 G).
Page — 2 HIn3637 Manual
The optional X100 probe shifts the measurement range
to 400 nT to 40 mT (6 mG to 400 G). An optional kit
converts the HIn3637 to indicate fields in field strength
units of amps/meter (A/m). See table 5-2 for optional
equipment.
HIn3637 Manual Page — 3
2.0 SPECIFICATIONS
Frequency
Response: 2 kHz - 3 dB
400 kHz - 3 dB
< 2 kHz 80 dB/decade rolloff
> 400 kHz 40 dB/decade rolloff
Figure 8nn1
HInn3637 Response Curve
Detector Response: True RMS field indication for
accurate measurement of
non-sinusoidal waveforms.
Dynamic Range: 100 dB
Page — 4 HIn3637 Manual
Ranges:
Standard: 40 nT, 400 nT, 4 :T, 40 :T,
400 :T full scale
Alternate Scale: 0.4 mG, 4 mG, 40 mG, 400
mG, 4 G full scale
*
*
With A/m option: 30 mA/meter, 300
mA/meter, 3 A/meter, 30
A/meter, 300 A/meter full
*
scale
*
Multiply all values by 100 when using the optional X100
probe
Accuracy: ± 5% at calibration
frequency
Linearity: ± 2% Full Scale
Recorder Out Level: 0 - 2.5 VDC, 25 :A
maximum
Recorder Out Jack: ¼ inch stereo phone jack
Battery: 12 VDC, 1400 mA-h
rechargeable Nickel-Cadmium
(NiCd)
Battery Life: Approximately 20 Hrs.
continuous operation
(full charge)
Battery Charger: 110/220 VAC, 16 hour
Environmental Operating
Temperature: 0°C to 50°C (+32°F to
+122°F)
Humidity: 5% to 95% relative humidity,
noncondensing
HIn3637 Manual Page — 5
Instrument Package:
Dimensions (Including
connectors): 165 mm x 95 mm x 70 mm
(6.5 in x 3.75 in x 2.75 in)
Weight: 0.88 kg (31 oz)
Standard Probe:
Type: External, three-axis multi-turn loop
I. D. (each loop): 110 mm (4.33 in)
O. D. (each loop): 116 mm (4.57 in)
Area (each loop): 0.010 m² (15.5 in²)
Overall Diameter: 127 mm (5 in)
Handle Length: 292 mm (11.5 in)
Cable length: 1.5 meters (5 ft)
Weight: 0.45 kg (16 oz)
Optional X100 Probe:
Type: External, three-axis single-turn loop
Loop Dimension: 12.7 mm (.5 in) per side
Area (each loop): 6.35 mm² (.25 in²) per side
Overall Diameter: 34.3 mm (1.35 in)
Overall Length: 292 mm (11.5 in)
Cable length: 1.5 meters (5 ft)
Weight: 0.31 kg (11 oz)
Page — 6 HIn3637 Manual
HIn3637 Manual Page — 7
3.0 ACCEPTANCE AND CONTROLS
Introduction
This section contains information on: unpacking and
acceptance of the HIn3637; the battery; the battery
charger, and; all controls, indicators and connectors (refer
to figure 3n2 for the location of these components).
Unpacking and Acceptance
Step 1. Upon delivery of your order, inspect the
shipping container(s) for evidence of
damage. Record any damage on the delivery
receipt before signing. In case of concealed
damage or loss, retain the packing materials
for inspection by the carrier.
Step 2. Remove the meter and probe from the
shipping containers. Save the boxes and any
protective packing materials for future use.
Step 3. Check all materials against the packing list to
verify that the equipment received matches
that which was ordered. If you find any
discrepancies, note them and call Holaday
Customer Service for further instructions.
Be sure that you are satisfied with the contents of your
order and the condition of your equipment before using
the meter.
Battery
The 12 VDC, 1400 mA-h NiCd battery provides up to 20
hours of meter operation when fully charged.
Battery Charger
Refer to Figure 3n1 for the following step.
Step 1. Check the viewing window on the power
entry module to verify that the battery
charger is set to the proper voltage for your
AC power source. If not, change the setting
via the following procedure: After ensuring
that the charger is unplugged, use a small
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