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Elma 6400 LCR Meter Manual

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Elma 6400
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Inductance
Some inductors are intended to operate at a certain DC bias to achieve a certain
inductance value.However,the LCR meters cannot produce such biasing scheme
and external biasing should not be attempted because external power would be
applied to the instrument and cause serious damage to the meter. Therefore, in
some cases, measured inductance reading may not agree with manufacturer’s
specification. It is important to check if specification pertains to DC biasing or not.
Resistance
When measuring resistance of devices, it is important to know that there are two
types or ways of measurement. One type is DC resistance measurement. Another
type is AC resistance measurement. The LCR meter provide both of types for
measurement. When measuring a resistive component that is designed to be
measured with DC, readings will be incorrect or inaccurate.Before using the meter
to measure resistance, please verify whether the DUT (device under test) requires
DC or AC resistance measurement method. Depending on the method,results will
vary greatly.
8-4 Guard Terminal
One of the input sockets and terminals is labeled as "GUARD". This terminal does
not have to be used in all instances for the meter to make measurements.But in
some instances, it is very useful. Guard terminal generally serves two purposes. If
user is using test leads, the guard terminal can be used to connect to the shielding
of the test leads. Doing so can be useful when making large resistive component
measurements. For example, when measuring a 10 MΩ resistor with test leads, at
the high range the reading may seem to be unstable as a few digits may
continuously be changing. Having the shield of the test leads connected to the
guard terminal will help stabilize the reading in some instances. Guard terminal is
also used to minimize noise and to help minimize parasitic effects coming from the
component to be measured, thus allowing high precision results.
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