1.3.3 How Does The AT3600 Tester Run A Test
Because the programming of each test is done at a high level, it is not strictly necessary for you to know the details of how tests are executed within the tester. However, for some users this subject may be of interest, therefore a brief explanation has been included here.
When the test program is loaded into the tester, each individual test is assembled into a sequence of operations involving the components in the functional block diagram shown previously. The sequence is different for each test, and in some cases, it depends on which are the preceding and following tests in the program; but in all cases, it is optimized to give the best measurement speed and accuracy.
As an example, the sequence for measuring inductance may be summarized as follows:
For other tests, the sequence may be more complicated.
Notes: All the relay switching is completed before the test source is energized; this will ensure that there can be no arcing, and prolong the life of the relays.
In contrast to some LCR bridges, the AT Series testers trim the test source to give the user programmed test conditions. This will guarantee that the same test conditions are applied to all transformers that use the same test program.
At the end of the test, the source is safely ramped down, so that the relay switching for any subsequent test will always occur with the source removed.