Omicron CPC 100, Reference Manual

Page: 178 / 382

CPC 100 V1.41
6 - 14
It is recommended to perform all winding resistance measurements with the
CP SA1 connected to the CPC 100 V DC input sockets to protect yourself and
CPC 100 from high-voltage hazards. The CP SA1 must be used for
measurements using 400A DC output. Before using CP SA1 , you can check its
functionality by following the test procedure in ”CP SA1” on page 17-14. If the
CP SA1 is defective, contact OMICRON electronics sales office (for ordering
information, see ”Ordering Information for CP SA1” on page 17-14). Before
disconnecting the test leads, short-circuit the transformer’s terminals and then
remove the wirings to
CPC 100 .
Figure 9:
Winding resistance test
using
400A DC output
Due to the significant time span needed for the transformer’s inductance to finish
its loading process, this test evaluates the deviation of measured values within
a time interval of 10 seconds. The winding resistance is continually measured
and stored in
CPC 100 internal memory. The calculated difference between the
maximum and minimum measured values in % within the last 10 seconds is
displayed.
Furthermore, this test comprises the option to take a temperature compensation
for copper (Cu) into consideration (refer to page 6-17).
CP SA1