A4
Cautions When Making Your Own Measurement Probe
Appx. 3 Cautions When Making Your Own
Measurement Probe
Observe the following precautions when making your own measurement probe.
• You must connect the shields of the SOURCE-H and the SOURCE-L. If the shields are not connected, the
impedance cannot be measured.
• When the probe is connected to the object being measured, place the SOURCE-H and the SOURCE-L at the
outer side and the SENSE-H and the SENSE-L at the inner side in relation to the object being measured. If
you do not connect the probes in this fashion, the correct measurement values may not be obtained.
• A coaxial cable is recommended when self fabricating the measurement probe.
<Recommended coaxial cable specications>
• Conductor resistance: 150 m
Ω
/m or less
• Capacitance: 150 pF/m or less
(Example: RG58A/U, etc.)
Measuring
object
SOURCE-H
SOURCE-L
SENSE-L
SENSE-H
Shield
• If you connect the cables together so as to measure the object being measured using the two-terminal
connection, you will not be able to obtain the correct measurement values.
Measuring
object
• You must not place the measurement probes near a metal body. In particular, move any portion other than the
four-terminal pair structure away from metal bodies. An eddy current produced in a metal body may cause a
large error in the measurement value. For details, refer to “Inuence of the Eddy Current” (p. A8).
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