User`s manual

41
Component
Settin
g
& Test
The Separate method uses the same adapter connector(s) as the device-under-test. The Net
List will document correctly without using Custom Test Point Labels. Additionally, the original
2-wire Net List is preserved when converting to 4-wire.
Note: Since the first scanned point of a four wire pair becomes the visible point, make sure
hidden point adapter(s) are in a higher-counting “J” position than Net List adapter(s).
Placing Kelvin Points
The two wires in each 4-wire pair must physically join to one test point of the device-under-test
in a manner that creates a kelvin point (KP).
Definition - Kelvin Points (KP)
A kelvin point is a place that makes a “Y”
junction by joining three parts.
• One of the end points of the 4-wire
measurement.
• First wire of a 4-wire pair.
• Second wire of a 4-wire pair.
Note: The “Y” junction can be a solder joint or it can be where a paired wire on one side of the
measurement is closest to a paired wire on the other side.
Each 4-wire measurement requires two kelvin points; one at each end. The kelvin points
should be placed as close to the device under test as possible. This is because the 4-Wire
Test measures from kelvin point to kelvin point, so any contact and lead resistance between
the kelvin points is added to the resistance measurement of the device-under-test (DUT).
Kelvin Point Placement and the 4-Wire Measurement