Professional Voltage Tester Calculator

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Estimate voltage deviation and check if a measured voltage reading is within the allowed tolerance. Suitable for DC/AC low-voltage circuits, batteries, power rails, and electronic equipment verification.

Input Parameters

Nominal Voltage

Enter the expected nominal voltage.

Measured Voltage

Voltage shown on the tester.

Tolerance (%)

Allowed voltage tolerance.

Voltage Type

Results

Status

Difference

Deviation (%)

Allowed Range

Test Note

Equations Used

Voltage Difference = Measured Voltage - Nominal Voltage

Deviation % = (Measured - Nominal) / Nominal × 100%

Minimum Allowed = Nominal × (1 - Tolerance %)

Maximum Allowed = Nominal × (1 + Tolerance %)

Frequently Asked Questions (FAQ)

Q1: Why is my measured voltage different from nominal?
A: Could be load drop, cable loss, battery state, or tester accuracy.

Q2: Can I use this for AC voltage?
A: Yes, but only for measurement comparison; always follow safety procedures for live AC.

Q3: What tolerance should I set?
A: Use the allowed range specified by datasheet, device spec, or regulator tolerance.

Q4: Does this replace actual measurement judgment?
A: No. Use it for reference only; always verify with the tester reading.

Q5: Is it suitable for batteries?
A: Yes, for DC batteries like Li-ion, alkaline, lead-acid; consider state-of-charge for accuracy.

Disclaimer: For reference only. Does not replace safety procedures. High-voltage or mains testing requires qualified personnel.

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