Type 6220-1B Audio Isolation Transformer

SOLAR TRANSFORMERS UPDATE
Effective January 2017, we have assigned new part numbers to our line of audio isolation transformers. Rest assured that the same performance you have trusted for more than 50 years has not changed.

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.

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.

APPLICATION
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.

The transformer may also be used as a pickup device to measure low frequency EMI currents at lower levels than conventional current probes.

In addition, its secondary may be used as an isolating inductor in the power line during transient susceptibility tests. (See Application Note AN622001.)

DESCRIPTION
The transformer is capable of handing up to 200 W of audio power into its primary over the frequency range 30 Hz to 250 kHz. The turns ratio provides a two-to-one step down to the special secondary winding. The secondary will handle up to 50 A of AC or DC without saturating the transformer.

Another secondary winding is connected to a pair of binding posts suitable for connecting to AC voltmeter as directed by the applicable EMI specifications. This winding serves to isolate the voltmeter from power ground. Neither the primary nor the secondary windings are connected to the end bells of the core. 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.