Frank Szmulowicz, Ph. D. Apr 23, 2015:

pct could be percentage. However, 75 is the same number as the phase angle in your next question.

Piotr Żyra (asker) Apr 22, 2015:

This would make sense. I asked the client, but their representative is unavailable most of the time.

Frank Szmulowicz, Ph. D. Apr 22, 2015:

Possibly, shot = próba
Colloquially, we say take a shot (from basketball or soccer), that is try.

Piotr Żyra (asker) Apr 22, 2015:

The entire calibration procedure is carried out via software provided by IES. Firstly, a copper bar is clamped in a 8-pole fixture, then this fixture is connected to a tester, and finally the operator is to run the software and calibrate the tester.

Frank Szmulowicz, Ph. D. Apr 21, 2015:

What kind of switches are involved?