How do you calculate high-voltage test workload?

Divide units scheduled for HV test by total units built, times 100. With 8 of 250 units scheduled, that's 8 ÷ 250 × 100 = 3.2% coverage.

Should every unit get a high-voltage test?

Safety-critical power products often require 100% hipot on every unit; sampling plans apply where standards allow. The 3.2% in the example is a low sampling coverage that leaves a 91.8-point gap to a 95% target.

What is HV or hipot testing?

A dielectric-withstand test applies a high voltage across isolation barriers to verify insulation holds off without breakdown or excessive leakage, a core safety check for mains-connected power electronics.

Why track HV test workload as a metric?

It sizes test-cell capacity and proves coverage compliance. If build volume outpaces HV test throughput, coverage silently drops below your target and you have an audit and safety exposure.

Coverage gap, what does a 91.8-point gap mean?

It means your actual 3.2% coverage sits 91.8 points below the 95% target. That's a large shortfall to close, either by scheduling more units to test or revising the target.

Does high coverage guarantee safe product?

No. Coverage only counts units tested. The test voltage, ramp, and leakage limits must be correct for coverage to translate into real fault detection.

Power Electronics, Motors & Drives calculator

High-Voltage Test Coverage Calculator

High-voltage test workload is the share of built units routed through high-voltage or dielectric-withstand (hipot) testing out of everything produced. Test engineers and quality managers on power electronics and motor-drive lines use it to size HV test capacity and to confirm coverage matches the safety or customer requirement. Insulation and isolation faults are safety-critical, so the fraction of units that see an HV test, and the gap to your target coverage, is a governance metric, not just a throughput one. It also flags when HV test is becoming a bottleneck as build volume climbs.

What this calculator does

Calculate high-voltage test coverage from units requiring hipot or insulation test, total units built, and the target coverage percentage.
Use it when planning hipot, insulation resistance, surge, partial discharge, or dielectric test workload for motors, inverters, drives, and power supplies.
It computes the percentage of built units scheduled for HV test and the point gap to your target coverage.

Formula used

High-voltage test workload rate = units scheduled for HV test ÷ total units built or released × 100
High-voltage test coverage gap = target HV test coverage - high-voltage test workload rate

Inputs explained

Units scheduled for HV test:
Total units built or released:
Target HV test coverage:

How to use the result

Use it to plan HV test cell capacity and to audit that coverage meets your safety or contractual sampling plan.
It measures coverage, not test outcomes, 100% coverage with a wrong test voltage still misses faults.

Current U.S. benchmarks

The producer price index for primary nonferrous metals (a broad metals benchmark, not copper alone) stands at 544.731 (BLS, Aug 2026), up 49.3% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,543 per tonne (IMF via FRED, Jul 2026).
The U.S. has 11,261 computer and electronic products establishments employing about 815,443 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate high-voltage test workload? Divide units scheduled for HV test by total units built, times 100. With 8 of 250 units scheduled, that's 8 ÷ 250 × 100 = 3.2% coverage.
Should every unit get a high-voltage test? Safety-critical power products often require 100% hipot on every unit; sampling plans apply where standards allow. The 3.2% in the example is a low sampling coverage that leaves a 91.8-point gap to a 95% target.
What is HV or hipot testing? A dielectric-withstand test applies a high voltage across isolation barriers to verify insulation holds off without breakdown or excessive leakage, a core safety check for mains-connected power electronics.
Why track HV test workload as a metric? It sizes test-cell capacity and proves coverage compliance. If build volume outpaces HV test throughput, coverage silently drops below your target and you have an audit and safety exposure.
Coverage gap, what does a 91.8-point gap mean? It means your actual 3.2% coverage sits 91.8 points below the 95% target. That's a large shortfall to close, either by scheduling more units to test or revising the target.
Does high coverage guarantee safe product? No. Coverage only counts units tested. The test voltage, ramp, and leakage limits must be correct for coverage to translate into real fault detection.

Last reviewed 2026-08-12.