When troubleshooting a transformer, which measurement should be taken first?

When troubleshooting a transformer, the first measurement that should typically be taken is the input voltage. This step is crucial because it verifies whether the transformer is receiving the necessary voltage from the power supply to operate correctly. If the input voltage is not at the expected level, it indicates there may be an issue with the power supply or connections before delving into the transformer itself.

Measuring the input voltage first provides foundational information about the transformer’s operational status. If the input voltage is present and correct, further tests can be performed with greater confidence, knowing that the transformer is at least being powered correctly.

By starting with the input voltage, you can effectively rule out supply issues before moving on to assess the condition of the transformer coils through resistance testing or continuity checks and examining the output voltage.