Voltech AT5600, Руководство пользователя

Страница: 282 / 438

C H A P T E R 1 4 - A T E D I T O R
AT5600 User Manual 98-119 issue 14
Page 282
Ke lv in P re -Ch eck
(new feature in FW 7.220 / Editor 3.56.7)
The goal of the Kelvin check is to verify that there is continuity between the power
and sense lines for all nodes that are used in the test program. Over the course
of running a large batch of parts, the Kelvin connections could potentially become
contaminated with debris, varnish or could be simply misaligned to a specific part.
This pre-test of the connections provides a useful validation that the component is
fitted properly, which provides the best confidence in the following testing, as it
provides a check that the UUT is connected before any testing commences.
It also provides the same check before compensation to make sure the
compensation applied (for all later tests in a batch) is not bad, due to accidental
bad connections during compensation.
The check is run before the normal test sequence, and so sits “ before ” the normal
test program sequence. Hence any bad results due to connections are not sent to
the server, resulting in misleading false fail records. The user then has the chance
to correct any bad connections and resuming the test.
The Kelvin Pre-check does not tell you anything about the actual transformer
under test, but does confirm that SOURCE and MEASURE nodes are connected
to every pin used in the test. Hence it is still valid to use CTY and R to check your
actual UUT windings.
What is Tested
Any node (1-20) connected to a winding, core or screen terminal on the
schematic is tested once, even if the terminal is not used in a test.