User`s manual

37
Component
Settin
g
& Test
Twisted pairs: Minimum length 1 to 6 feet
depending on electrical characteristics of
twisted pair. Minimum of 3 wires in cable.
Same as Learn
4-Wire Kelvin: R
ANGE
: 0.001Ω to 1.0MΩ
±2% ±0.001Ω
Same as Learn
Links
In some cases, the tester may sense the electrical characteristics of a component but cannot
determine if the component is a resistor, diode, or capacitor. When this occurs, the tester
creates a “link”. During the Low Voltage Test, the tester assures the linked points have a
higher resistance than the Component Resistance Setting. Links may be created either
automatically by the tester or by the technician setting up the test.
Links created automatically by the tester
When verifying a learned test program, a technician may recognize that the tester created
links in the test program’s net list. In some cases, the tester may have assigned a
component a link because it was outside the tester’s learn range. However in some
instances, the component can still be effectively tested if the technician uses CTLWIN to edit
the links assigned by the tester. For example, in order to speed the learn process for the
majority of cables, the tester does not learn component resistances higher than
100KΩ. However, the tester does assign links to resistors with values that are above 100KΩ
and below the Low Voltage Insulation Resistance Setting, which can be set up to 5MΩ. If the
tester creates a link for a resistance in the 100KΩ and 1MΩ range, the technician can use
CTLWIN to replace the link with a resistance command, thereby allowing the tester to test the
resistance value.
Links created by the technician
In some instances the technician setting up the test Program may need to use CTLWIN to
create links in the Test Program. By linking two or more test points, the tester will treat the
linked points as one net during the hipot test.
Building 4-Wire Test Fixtures
Using four wires in two pairs per measurement, 4-wire fixtures connect each pair’s T1 and T2
points at the 1100H to a kelvin point (KP) as close as possible to the device-under-test.
Note.
You can mix 2-Wire Testing with 4-Wire Testing in any combination.
Important! Before you begin building 4-wire fixtures, it is necessary to identify which pins of an
adapter are T1 and T2 points. Every 4-wire pair must have one of each.