Rated 4.9 (120 reviews)
The Ampetronic FSM is a handheld magnetic field strength meter for setting up and commissioning hearing loop systems to IEC 60118-4 (BS EN 60118-4). It measures field strength, A-weighted background noise and frequency response at 100 Hz, 1 kHz and 5 kHz, and has a headphone output for listening to the loop. It works on any manufacturer’s loop and is used by installers for commissioning, site surveys and maintenance visits.
400 mA/m
0 dB reference
3
Measurement modes
2x AA
Batteries included
5 years
Warranty
Features
Three calibrated modes: field strength, A-weighted background noise and frequency response
Frequency response checks at 100 Hz, 1 kHz and 5 kHz, for assessing metal loss
True RMS detection calibrated to 400 mA/m = 0 dB, 1 dB resolution
Colour-coded LED bar graph, green for -3 to +3 dB
Headphone output with volume control for listening to the loop
Checks coverage and overspill
Supplied with soft case, batteries and commissioning guide
5 year Ampetronic warranty
Specifications
| Reference level | 400 mA/m (field strength mode) |
| Frequency response | 50 Hz to 8 kHz (±0.25 dB); 30 Hz to 10 kHz (-3 dB) |
| Gain stability | Better than 0.5 dB |
| Coil orientation | Vertical with unit held upright |
| Headphone output | 3.5 mm stereo jack, 16 ohm minimum |
| Power | 2x AA alkaline (supplied) |
| Battery life | Up to 100 hours |
| Dimensions | 84 x 27 x 140 mm |
| Weight | 150 g without batteries |
| Operating range | -10 to 45°C, 10 to 85% relative humidity |
