how to calculate transformer turns ratio test?

To calculate the transformer turns ratio (TTR), you need to measure the primary and secondary voltages of the transformer under no-load conditions. The turns ratio is determined by the formula: TTR = V_primary / V_secondary. For accurate results, ensure the voltages are measured with a reliable voltmeter. Additionally, you can perform a TTR test using a specialized TTR tester, which applies a known voltage and measures the resulting secondary voltage to confirm the turns ratio.