Field Strength Meter

The FSM Magnetic Field Strength Meter from Ampetronic is a cost effective and simple solution for measuring, setting up and commissioning an induction loop system to the requirements of IEC60118-4. The meter is an ergonomically designed hand held instrument for measuring loop system performance. There are three calibrated operational modes for the assessment of Background Noise, Field Strength and Frequency Response as required to ensure correct function of the loop system. The meter also doubles as a loop listener, with a headphone output to listen to the signal in the loop.
The meter is supplied in a soft case  and with  full operating instructions including a guide to commissioning. The Ampetronic FSM can be used to monitor, set up or commission any induction loop system regardless of the manufacturer or type.

FSM Field strength meter

The FSM Magnetic Field Strength Meter from Ampetronic is a cost effective and simple solution for measuring, setting up and commissioning an induction loop system to the requirements of IEC60118-4. The meter is an ergonomically designed hand held instrument for measuring loop system performance. There are three calibrated operational modes for the assessment of Background Noise, Field Strength and Frequency Response as required to ensure correct function of the loop system. The meter also doubles as a loop listener, with a headphone output to listen to the signal in the loop. The meter is supplied in a soft case  and with  full operating instructions including a guide to commissioning. The Ampetronic FSM can be used to monitor, set up or commission any induction loop system regardless of the manufacturer or type.
Applications include

Accurate set-up and commissioning
System monitoring and maintenance
Site surveys
Certification to IEC60118-4
Assessment of frequency losses due to metal
Assessment of loop coverage and overspill
Assessment of background noise

Included Accessories

Soft carry pouch
User guide/handbook
Commissioning Certificate (template)
Batteries

Simple assessment of any system toIEC60118-4
Three modes of operation for three test types
A-Weighted background noise • Broad band mode (50Hz – 8kHz)
Frequency response (100Hz, 1kHz, 5kHz)
True RMS detection calibrated to400mA/m = 0dB
Wide viewing angle LED display
Colour coded LEDs for simple readout
Resolution to 1dB
Head phone output with volume control
Ergonomic, rugged, light weight construction
Quick start guide
Soft carry case
5 year warranty

Background Noise
To determine the level of the background magnetic field present in the intended location for the loop system. Also used to measure low level signals to assess overspill outside a loop system.

A-Weighted filter
True RMS detection referenced to 400mA/m
Scale -42 to -12dB
Audio (headphone) output is post filter for monitoring

Field Strength
A broad band measurement to measure field strength delivered by the system.

Broad band measurement 50Hz to 8kHz
True RMS detection referenced to 400 mA/m
Scale -22 to +8dB with 1dB intervals from -3 to +6dB
Suitable for use with sine wave, pink noise, or combination signals (provided), or any other real signals

Frequency Response
Third octave filters for measuring performance across the required frequency spectrum as required by IEC60118-4.Used to confirm adequate power at high frequencies as required for good intelligibility. Used to assess frequency dependent loss due to metal structures, and to optimise frequency compensation.

Third octave bands at 100Hz, 1kHz and 5kHz
True RMS detection
Scale resolution to 1dB
For use with pink noise only (signal provided)
Audio (headphone) output is post filter

Specifications
Magnetic field measurement

Coil orientation
Vertical when unit held upright

Reference level
400mA/m (In Field strength mode)

Frequency response
50Hz to 8kHz ±0.25dB

 
30Hz to 10kHz -3dB

Gain stability
Better than 0.5dB over all conditions

 
Outputs

Display
Flying spot LED bar graph with wide viewing angle

 
Colour coded (green for -3dB to +3dB)

Audio (headphone)
16Ω min (32Ω per side)

 
3.5mm stereo jack connector

 
Power

Battery
2 x AA alkaline (supplied)

Battery monitor
Battery OK when LED illuminated

Battery life
Up to 100hrs use, dependent on use pattern

 
Physical

Dimension
84 x 27 x 140mm (meter only)

Weight
150g excluding batteries

Operating environment
-10 to +45°C

 
10 to 85% RH