This is necessary because excessive capacitance could also couple AC current from the primary to the secondary. Isolation transformers are commonly designed with careful attention to capacitive coupling between the two windings. A well-known example is the Austin transformer for the power supply of air-traffic obstacle lamps on mast radiators insulated against ground. Isolation transformers are also used for the power supply of devices not on ground potential. By using an isolation transformer, the bonding is eliminated, and the shock hazard is entirely contained within the device. Grounded objects near the device under test (desk, lamp, concrete floor, oscilloscope ground lead, etc.) may be at a hazardous potential difference with respect to that device. In electronics testing, troubleshooting and servicing, an isolation transformer is a 1:1 power transformer which is used as a safety precaution. Isolation transformers with electrostatic shields are used for power supplies for sensitive equipment such as computers or laboratory instruments. They also block interference caused by ground loops. Isolation transformers block transmission of DC signals from one circuit to the other, but allow AC signals to pass. An isolation transformer allows an AC signal or power to be taken from one device and fed into another without electrically connecting the two circuits. An isolation transformer is a transformer, often with symmetrical windings, which is used to decouple two circuits. Here is a definition from Wikipedia, which explains a little more: I needed to read up to fully understand and now I feel posting the Wikipedia will make this thread complete.
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