Dual function induction loop field strength meter
The FSM is designed to allow the accurate measurement of loop field strength within an area covered by an induction loop (AFILS) system. The FSM has many features which make it ideal for surveying, commissioning and periodically testing all induction loop installations. The LOW range setting is provided for measuring cross talk between loop systems and interference from mains equipment such as lighting, dimmers and computer equipment. An "A weight" filter is provided allowing measurements of the audio as the loop is heard by the human ear, this also rejects mains hum allowing accurate assessment of loop installations in areas of high electrical noise.

Using the FSM held vertically, walk through the area covered and note the average level of the loop field, adjusting the loop amplifier if necessary so that the average field strength is between -3dB and +3dB over 90% of the area. It is also wise to mark on a plan areas of poor coverage or high background noise so hearing aid users can be directed away from these areas.

Features
Low range: (-40dB) High
High range (+9dB) Ranges
Selectable range: "A" Weight and Flat
Filter Conforms to IEC118
Belt Clip

Specification
Display Type: 10 LEDs
Battery: 9V PP3
Field sensitivity: 1mAM-1
Display Range: 30dB
Low Range: -40dB to -13dB
High Range -21dB to +6dB

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