Holaday Industries Inc. HI-3637 Medidor de Nível
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Modelo:
HI-3637
Data:
1993
Categoria:
Grupo:
Descrição:
VLF Magnetic Field Meter
Informação
The HI-3637 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 HI-3637 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
root-mean-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 HI-3637 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 HI-3637 immune to most electric field effects.
The HI-3637 has a wide dynamic measurement range: 4 nT to
400 ¿iT (100 dB). This makes the HI-3637 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).
The optional XI00 Probe shifts the measurement range to 400
nT to 40 mT (6 mG to 400 G). An optional kit converts the
HI-3637 to indicate fields in field strength units of
amps/meter (A/m).
Tipo de manual:
Manual do Usuário
Páginas:
52
Tamanho:
5.08 Mbytes (5326142 Bytes)
Idioma:
english
Revisão:
ID de manual:
600055
Data:
1993 09 01
Qualidade:
Scaned documento, todas legível.
Data de upload:
2017 02 04
MD5:
74b444d101588deac64ac5bb0ba3cd4d
Downloads:
509
Informação
1.0 DESCRIPTION ... 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 . . ... 12
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) ... 29
VDT CHARACTERISTICS ... 29
General Description ... 29
Principles of Operation ... 29
Modulated DC Fields ... 30
60/50 Hz Fields ... 31
Deflection System Fields ... 31
Broadband RF Fields ... 32
CHARACTERIZING VDT EMISSIONS AND
OPERATOR EXPOSURE ... 33
Introduction ... 33
Characterizing VDT Emissions ... 33
GUIDELINES FOR RF EXPOSURE ... 35