How do you calculate drive test time?

Divide the drives to test by the test completion rate for base time, then multiply by one plus the allowance. For 120 drives at 12 per minute, base time is 10 minutes and a 10% allowance gives 11 minutes required.

What allowance should I use for drive testing?

8-15% is typical for connecting the DUT, running the sequence, and retesting occasional fails. The 10% default fits a mature line with a low retest rate; raise it if first-pass yield is weak.

Does the completion rate include burn-in time?

Only if your rate reflects the full station-occupancy including burn-in. If burn-in runs in parallel on a rack, model it separately — otherwise the entered 12 drives per minute overstates functional-test throughput.

Why is my station always the bottleneck despite a fast rate?

Because the raw rate ignores connect, disconnect, and retest. The allowance turns 10 base minutes into 11; if retests are frequent, your real allowance may be 20-30%, which is where hidden bottlenecks live.

Drive test time vs cycle time per drive — how do they relate?

This gives batch minutes; divide by the number of drives to get per-unit test time. For the example, 11 minutes over 120 drives is about 5.5 seconds of test-station time per drive.

How do I size how many test stations I need?

Compute required test minutes for a shift's volume and divide by available station minutes per shift. If that exceeds one station's capacity, add stations to keep test off the critical path.

Power Electronics, Motors & Drives calculator

Drive Test Time Calculator

Drive Test Time estimates the labor and station minutes needed to functionally test a batch of variable-frequency or servo drives, with an allowance built in for fixturing, connection, and retest of marginal units. Test engineers and end-of-line supervisors use it to size test-station capacity, schedule burn-in and functional test slots, and cost the test step of a drive program. Drive test is frequently the last capacity gate before shipment, so an accurate estimate prevents test from silently throttling an otherwise-fast build line. The allowance is what separates a clean throughput number from the reality of connecting DUTs, running dielectric and functional sequences, and re-running the occasional fail.

What this calculator does

Estimate total test time for VFDs, servo drives, inverters, or converters from unit count, test rate, and retest or setup allowance.
Use it when planning functional test, load test, firmware verification, hipot, thermal run, or end-of-line drive test capacity.
It computes required drive test time as base time (drives divided by test completion rate) scaled up by a setup-and-retest allowance factor.

Formula used

Base drive test time = drives to test ÷ drive test completion rate
Required drive test time = base drive test time × allowance factor

Inputs explained

Drives to test:
Drive test completion rate:
Setup and retest allowance:

How to use the result

Use it when sizing test-station capacity, scheduling functional or burn-in test, or costing the test step of a drive build.
A single completion rate assumes one test recipe — drives with longer burn-in or extra safety sequences will test far slower than the entered rate implies.

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Common questions

How do you calculate drive test time? Divide the drives to test by the test completion rate for base time, then multiply by one plus the allowance. For 120 drives at 12 per minute, base time is 10 minutes and a 10% allowance gives 11 minutes required.
What allowance should I use for drive testing? 8-15% is typical for connecting the DUT, running the sequence, and retesting occasional fails. The 10% default fits a mature line with a low retest rate; raise it if first-pass yield is weak.
Does the completion rate include burn-in time? Only if your rate reflects the full station-occupancy including burn-in. If burn-in runs in parallel on a rack, model it separately — otherwise the entered 12 drives per minute overstates functional-test throughput.
Why is my station always the bottleneck despite a fast rate? Because the raw rate ignores connect, disconnect, and retest. The allowance turns 10 base minutes into 11; if retests are frequent, your real allowance may be 20-30%, which is where hidden bottlenecks live.
Drive test time vs cycle time per drive — how do they relate? This gives batch minutes; divide by the number of drives to get per-unit test time. For the example, 11 minutes over 120 drives is about 5.5 seconds of test-station time per drive.

Last reviewed 2026-05-12.