Appx.6
Supplying DC Bias
Countermeasures against noise from the measurement cables
If interference is producing noise in the measurement cables, its inuence can be moderated by the
following countermeasure.
Attach an EMI ferrite-core lter to the commercial cable.
Pass the test cables through a commercially available anti-interference ferrite core, and x it close
to the measurement terminals, so as to suppress noise from the measurement cables.
Moreover, if the internal diameter of the ferrite core allows, winding the measurement cables sev-
eral times around the ferrite core (as with the power cord as described above) may further reduce
the amount of noise.
Anti-interference ferrite core
Appx. 5 Supplying DC Bias
CAUTION
A voltage must not be applied to the measurement terminals of the instrument from an
external source.
If a voltage is applied from an external source, the instrument may be damaged.
Supplying DC bias means that a DC voltage is supplied as a bias to a sample for test whose char-
acteristics are voltage dependent, such as an electrolytic capacitor or a ceramic capacitor.
Further, a DC current can be supplied as a bias to a sample for test whose characteristics are cur-
rent dependent, such as a choke coil.
This instrument does not provide a DC bias input terminal. DC bias should be applied using the
method described below.
• When applying DC bias during measurement, enable the internal DC bias setting and set the voltage to 0.00
V. (See "DC bias (superimposing a DC voltage on the measurement signal)(AC)" (p. 59))
• Rdc measurement cannot be performed when applying DC bias since a DC-cut capacitor is included in the
circuit.
• The DC bias setting cannot be enabled when a parameter has been set to Rdc. Do not set any parameter
to Rdc.
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