When measuring the short-circuit current (Isc) of a PV string during commissioning, what instrument should be used?

When measuring the short-circuit current

Multiple choice — select the best answer

AA DC clamp meter rated for the expected current and voltage
BA standard AC clamp meter
CA megohmmeter set to 500 V
DAn insulation resistance tester set to 1000 V

✓ Correct answer: A. A DC clamp meter rated for the expected current and voltage A DC clamp meter rated for both the expected current and the open-circuit voltage is required because PV strings produce DC current. Standard AC clamp meters cannot accurately measure DC, and megohmmeters measure insulation resistance, not current.

.q-expl{display:block!important}.q-opt[data-idx="0"]{border-color:#16a34a;background:#f0fdf4}.q-opt[data-idx="0"] .oltr{background:#16a34a;color:#fff}.q-opt{cursor:default!important;pointer-events:none}

Keep practising. Use the free Solar PV NABCEP PDF, watch the YouTube walkthrough, or unlock all 10 web questions with timed mock exams.

Free PDF Video walkthrough

Topic: Commissioning & O&M

← Previous 🎲 Random question ↩ Back to all questions

Keep practising

When measuring the short-circuit current (Isc) of a PV string during commissioning, what instrument should be used?

Related questions — Commissioning & O&M

Free practice here. Timed mocks when you are ready.