Almost all AC hum (60Hz in the US, 50 Hz in most other countries), is caused by ground loops. These ground loops act like radio antennae picking up hum and. Ebtech Line Level Shifter & Hum Eliminator. The high-quality transformers used in these boxes have a flat frequency response from 20Hz to

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The Kyoritsu A a digital loop impedance tester, capable of measuring prospective short current (PSC). Designed to comply with an IP54 rating, the A is. Kyoritsu A. Custom microprocessor controlled for highest accuracy and reliability. 3 LEDs for checking correct wiring status. 15mA LOOP

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