![]() Getting a few volts more out than in tells you the windings aren't equal, its not a perfect 1:1 but again, read up and learn how they work. Sounds like the one you're using is pretty close to 1:1. That alone will answer a lot of questions. It helps to understand how they work in the first place. It’s simple do.Īs others have said, isolation transformers don't regulate, and they don't even really isolate, except in the sense of from DC. If your transformer floats the secondary above ground you should have an electrician wire it as a grounded power system. Medical grade transformers are meant to be used by qualified personnel only. Usually a digital meter reading will be all over the place and will not hold steady. Any voltage readings from either contact to ground will be phantom voltage. If the isolation transformer was left ungrounded then you have an Isolated Power System. (You said it runs 124Vac.)Longer slot of the two, or ’T’ slot, the neutral contact should measure a solid zero volts to ground. Short slot of the outlet to equipment ground should measure 120VAC nominal. ![]() If the isolation transformer is wired as a Grounded Power System: I would suggest you use a volt meter and measure for voltage from both contacts to the equipment ground contact on the outlets. Therein, not to the metal case/enclosure of the transformer or to the ground contact of the receptacle outlets. Neither of the two hot conductors have a reference to ground. That means both AC Line contacts on the receptacle outlets are fed from Hot ungrounded legs, conductors. Most medical grade isolation transformer I have ran across float the secondary winding above ground. What is the Kva rating? It will say on the data plate.ĭoes it say ’Medical Grade’ anywhere on it? May be used as a pickup device or an isolating inductor in other tests.It was apparently used in a hospital. High current secondary uses 1/4-20 threaded studs.Ĭapable of handling the audio power required by EMI specifications and up to 50 A of AC or DC through the secondary in series with the test sample. ![]() Standard 0.75" spacing of binding posts allows use of standard plugs. Provides a convenient bench model unit with three-way binding posts on primary and output voltmeter leads. The transformer may be used as a 4 Ω primary and 1 Ω secondary or 2.4 Ω primary and 0.6 Ω secondary or 2 Ω primary and 0.5 Ω secondary. Neither the primary nor the secondary windings are connected to the end bells of the core. This winding serves to isolate the voltmeter from power ground. The secondary will handle up to 50 A of AC or DC without saturating the transformer.Īnother secondary winding is connected to a pair of binding posts suitable for connecting to AC voltmeter as directed by the applicable EMI specifications. The turns ratio provides a two-to-one step down to the special secondary winding. To 200 W of audio power into its primary over the frequency range 30 Hz to 250 kHz. In addition, its secondary may be used as an isolating inductor in the power line during transient susceptibility tests. The Solar Type 6220-1B Audio Isolation Transformer was especially designed for screen room use in making conducted audio frequency susceptibility tests as required by MIL-STD-461/462 and other EMI specifications.Īs a pickup device to measure low frequency EMI currents at lower levels than conventional current probes. The part number changes indicate that we will now provide for each transformer a serial number, a frequency response curve, a correction factor curve for the voltmeter winding, and a certificate of calibration with a five-year calibration cycle. Why the change after all these years? Because you, our valued customers, began requesting data and certificates of calibration for our transformers, which historically we did not provide. Rest assured that the same performance you have trusted for more than 50 years has not changed. Effective January 2017, we have assigned new part numbers to our line of audio isolation transformers.
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