Certify installation

It’s important to plan and design the loop carefully and check the system when the installation is completed. To ensure the loop installation meets the requirements of field strength, consistency and frequency response, it must comply with the international standard IEC 60118-4. Use a FSM Field Strength Meter and follow the Certificate of Conformity.

Univox FSM (New!)

Univox FSM Field Strength Meter – product page

Certificate of Conformity – Univox FSM

FSM Test signals (download sound files)

Discontinued products


Univox FSM Basic (discontinued product)

Univox FSM Basic Field Strength Meter – product page

Certificate of Conformity – Univox FSM Basic

Univox FSM 2.0 (discontinued product)

Univox FSM 2.0 Field strength meter – product page

Certificate of Conformity – Univox FSM 2.0


The International Electrotechnical Commission (IEC) is the world’s leading organization that prepares and publishes International Standards for all electrical, electronic and related technologies. The IEC, founded in 1906, is one of three global sister organizations (IEC, ISO, ITU) that develop International Standards for the world.

Joint committees ensure that International Standards combine all relevant knowledge of experts working in related areas. The TC-29/MT-20 committee developed an improved standard for induction loop systems, IEC 60118-4, in 2006. The standard was updated 2015.