Selecting an impulse voltage generator starts with the test standard, not the maximum voltage printed on a specification sheet. Check the latest adopted requirements of IEC 60060-1, IEC 60060-2, or IEEE Std 4. Confirm the required waveform, such as a 1.2/50 μs lightning impulse or a switching impulse. The generator should reproduce the waveform consistently under the planned load. Small errors matter.

Measurement accuracy depends on the complete measuring system. Review the voltage divider’s bandwidth, response time, calibration status, and uncertainty budget. The recording system also needs adequate sampling speed and trigger stability. Ask for traceable calibration records, not only a claimed accuracy percentage. In practical testing, poor grounding can distort a clean waveform and create misleading overshoot. This detail is easy to overlook. A useful specification should state tolerances at the test point, not just inside the generator.

Safety features deserve equal attention. Look for interlocked doors, visible warning lights, emergency shutdown controls, automatic discharge circuits, and verified grounding points. Remote operation can reduce exposure, but it cannot replace a physical safety procedure. Test areas should prevent access while voltage remains present. I would also inspect discharge confirmation, maintenance access, and fault logging before purchase. A rushed evaluation may miss a weak interlock. That mistake can become expensive, or dangerous.