Appendix 1 Precautions for Making Custom Test Leads
A1
Appendix
Bear the following in mind when making custom test leads.
• Be sure to twist together the SOURCE-H and L leads, and the SENSE-H and
L leads. Also, connect the shields of all leads to the ground.
• The four-terminal design requires that all four terminals be used for measure-
ment. Attempting to measure with two terminals (the two lines in the middle)
may result in unstable or inconsistent measurements due to the effects of test
lead contact resistance.
• When connecting to a test object, connect SOURCE-H and SOURCE-L
toward the outside, and SENSE-H and SENSE-L toward the inside.
Appendix
Appendix 1 Precautions for Making Custom Test
Leads
SOURCE-H
SENSE-H
SENSE-L
SOURCE-L
Shield
Shield
SOURCE-H
SOURCE-L
SENSE-H
SENSE-L
H
L
H
L
SOURCE-H
SENSE-H
SENSE-L
SOURCE-L
+
-
Wrong Connection
Probe tip and connection points
Resistance
(Battery)
SENSE-H
SOURCE-H
SOURCE-L
SENSE-L
+
-
Resistance
(Battery)
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