F.W. Bell 7030, Инструкция по эксплуатации

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F.W. BELL Model 7030 Gauss/Tesla Meter Instruction Manual
1-4 Section 1 - Introduction
GENERAL
DESCRIPTION
(Continued) Zero
The “zero” function allows the user to remove undesirable readings
from nearby magnetic fields (including earth’s) as well as to remove
initial electrical offsets in the probe and instrument. A “zero flux
chamber” is included as an accessory which shields the probe from
external magnetic fields during this operation. Channels may be
zeroed independently or all at once.
Hold
When the hold function is enabled the instrument will “hold” and
display the highest and/or lowest flux density readings that have been
measured. Hold features include capturing peaks and valleys of rapid
changing pulses as well as arithmetically calculated max and min of
slow changing signals.
Relative
Another feature, called “relative mode”, allows large flux readings to be
suppressed so that small variations within the larger field can be
observed directly.
Update Interval
The update interval of the reading may be adjusted. Shorter update
intervals allow rapid fluctuations in flux density levels to be observed.
Longer update intervals provide higher resolution and stability in the
flux density reading.
Analog Output
Each channel provides a corrected and uncorrected analog output
voltage signal available from standard BNC connectors. The
uncorrected output signal is representative of the magnetic flux density
measured by the Hall probe. The corrected output signal is
compensated for influences of temperature and frequency variations,
as well as non-linearities inherent in the Hall probes and instrument.
The corrected output is specified with a higher accuracy than the
uncorrected output, with a bandwidth up to 200 Hz. The uncorrected
output is less accurate, but has a bandwidth up to 50kHz.