The sensitivity achieved by this technique is better than. Since the sign of the factor is negative for most of the range, the sensitivity is considerably better than that of conventional current probes. 3 shows the correction factors required to convert narrowband signals to dB above one ♚. 2 provides the most pickup and transfer of energy over the frequency range 30 Hz to 150 kHz. ![]() 2).ĪCHIEVING MAXIMUM SENSITIVITY FOR CONDUCTED EMI CURRENT MEASUREMENTS Secondly, the transformer can be used for measuring EMI current as described herein ( see Fig. In this application all other windings are left open ( see Figure 1). First, the secondary winding can act as the series inductor suggested for transient injection tests to prevent the transient from being short-circuited by the impedance of the power line. Since the transformer is connected in series with each ungrounded power input lead (sequentially) for performing the audio susceptibility tests, it can be used for two additional purposes while still in the circuit. USE OF THE TYPE 6220-1B TRANSFORMER IN GENERAL The transformer may also be used as a pickup device to measure low frequency EMI currents at lower levels than conventional current probes. 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.
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