49
Component
Setting & Test
The Location of Kelvin Points in Fixturing
The location where the 4-wire pair physically
joins the test point connection of the device-
under-test is called a Kelvin point.
Each 4-wire measurement requires two Kelvin points; one at each end of the tested device.
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. The diagram below shows how the location of the Kelvin points will affect the
resistance measurement of the device-under-test.
DUT #1:
The measurement is only
of the device-under-test.
This is ideal, but in real
situations; it may be nearly
impossible.
DUT #2:
The measurement includes part
of the fixture.
Warning!
If a lot
of the fixture is between a Kelvin
point and the device-under-test,
the 4-Wire Test will be
considerably compromised.
DUT #3:
The measurement tests only
part of the device-under-test.
For example, by using probe
pins, you can eliminate the
resistance of a connector
from the measurement.
Summary of Contents for 1100R+
Page 1: ...Version 2011 1 0 November 10 2011 1100R User s Manual...
Page 28: ...24 Using the Tester...
Page 78: ...Connections continued Net Test Points Components...
Page 79: ...Notes...
