Tektronix TCP300A, Руководство пользователя

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Glossary
amp-second product
The unit of measure de fi ning the maximum amount of pulsed current that can
be measured before the probe core becomes saturated. The amp-second rating
applies only to measurement values between the maximum continuous and
maximum pulse current ratings of the probe. The amp-second rating is equal
to the peak current multiplied by the pulse width at the 50% point.
auto-balance
A process that removes unwanted DC offsets from the TCPA300 and
TCPA400 circuitry to ensure maximum measurement accuracy. This process
is performed during the probe degauss routine.
bucking current
Current fed back by the TCPA300 and TCPA400 to the current probe during
DC and low-frequency AC measurements. Bucking current nulls most of the
magnetic
fi eld in the probe core, allowing linear DC and AC measurements
simultaneously.
conventional current fl ow
The fl ow of the positive charge in a conductor. Conventional current fl ow is
from positive to negative. The arrows on current probes point in the direction
of conventional current
fl ow. Conventional current fl ow is in the opposite
direction of electron current fl ow .
degauss
A process of eliminating residual magnetism from the probe core by feeding
a decaying sine wave into the core. The degaussing process should be
performed before clamping the probe around a conductor, whenever the probe
becomes saturated by current overloads, or whenever the probe is exposed
to a magnetic
fi eld. The term is derived from one of the units of magnetic
fl ux density.
electron current fl ow
The fl ow of the electrons in a conductor. Electron current fl ow is from
negative to positive. The arrows on current probes point in the opposite
direction of electron current
fl ow. Electron current fl ow is in the opposite
direction of conventional current fl ow .
fl ux
The density of a magnetic fi eld. As the number of fl ux lines increases,
the magnetic fi eld strength increases. Current in the conductor under test
generates fl ux lines in the probe core by inducing a voltage in the core.
TCPA300/400 Ampli fi ers and TCP300A/400 Series Current Probes User Manual 61