What is magnetic isolation?

Question

I have a T6 PLC manufactured by Trol Systems. In the MCU-04-115 specs, the power requirements are 115VAC, .02A, 50/60 HZ w/1000v magnetic isolation. I understand everything except the w1000v magnetic isolation.

Over forty years playing with Electrical/Electronics I've never heard this term. We've used these for about 5 years and I just now noticed this. They work great and I don't have a problem with them. I'm just curious what they are telling me. Someone help me out.

Answer 1

Magnetic isolation is important sincereceivers produce undesired time varyingmagnetic fields outside their cases. Thesefields may be sensed by the hearing aidtelecoil and could create spurious inputsignals or cause a feedback loop. The VEFVibration Isolation receiver features twolevels of magnetic isolation. The case ofthe internal EF receiver acts at the primary magnetic shielding, or delicate wiring isrequired. The acoustic connection is madeat the port tube, which is rigid for easysealing. All delicate Litz wiring and wireloops needed for vibration isolation arealready completed inside the VEF receiver.Electrical connections are made by simplysoldering standard wire to the VEF terminalpads.Application GuidelinesThe VEF receiver suspension system ishighly integrated with the port tube andcase, resulting in a compact, vibration-reduced receiver system. This level ofmechanical integration and optimization,however, does place constraints on custommodifications for specific applications.Some changes that are normallystraightforward with traditional receiversmay be difficult to implement in the VEFVibration Isolation receiver.Coil changes are commonly requested andare straightforward to accomplish since theydo not affect the vibration isolation system.The same coil modifications that arepossible in EF receivers are also feasible inVEF receivers. Common changes includeimpedance changes, DC resistancechanges, two or three terminalconfigurations, and shock protected coils.The simplest approach involves reproducingthe electro-acoustic performance of anexisting EF receiver (e.g., EF-1937) in aVEF receiver (e.g., VEF-1937). Note thattwo terminal models may offer marginallybetter vibration isolation due to thesimplified internal wiring.