CREATING THE PROGRAM VOLTECH AT3600 USER MANUAL
PAGE 3.3.30. VPN 98 - 024 TEST PROGRAM EDITOR
3.12 FIXTURE COMPENSATION
Often when measuring small values of resistance, inductance or capacitance, the
effects of the fixture can add significant errors to the results. To allow you to make
more accurate measurements, the AT Series Testers have built-in firmware to
compensate for the fixture parasitics.
If fixture compensation is required, follow steps 1, 2 and 4 of the procedure in section
3.10 of this chapter, so that the tester is connected and the program is downloaded.
Then from the top-level menu bar, select:
Tester
Compensate Fixture
If your program does not contain any tests where compensation can be applied, you
will see the following message:
When you click on ‘OK’ to return to the top level menu, the tester will not make any
measurements.
Most programs will contain at least one test where fixture compensation can be
applied. In this case, you will then see one of two messages:
At this point you should ensure that the appropriate fixture has been placed on the
tester. With the first message, it is possible to leave the fixture empty.
The second message will be displayed when the program contains at least one test for
which short-circuit compensation is applicable. As the program may also contain
tests requiring open-circuit compensation, you should ideally plug a dummy header
into the fixture, where all the transformer windings are replaced by short-circuit links.
After you have clicked on the ‘OK’ button at either of the messages, the tester will be
commanded to make the compensation measurements for your test program.
If errors are encountered, such as a shorting link is not fitted, the editor will display
the appropriate warning message, and allow you either to try again, or to cancel the
compensation.
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