# EMFields Acoustimeter AM-11

> Single-axis broadband RF meter reading 200 MHz – 8 GHz with a peak display from 0.02 to 10.00 V/m and a true time-averaged display from 0.1 to 250,000 µW/m², plus an audio output for identifying sources by ear.

- Canonical URL: https://emfbase.com/instruments/acoustimeter-am-11
- Collection: Meter models
- Record id: `instruments:acoustimeter-am-11`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/instruments/acoustimeter-am-11
- Also known as: AM11, Acoustimeter, AM-11 Acoustimeter

## Key values

- **Manufacturer:** EMFields Solutions Ltd
- **Model:** AM-11
- **Type:** Broadband meter
- **Instrument class:** Broadband RF power-density meter
- **Quantities measured:** power density, electric field strength
- **Axes:** single
- **Peak hold:** Yes
- **On-device logging:** No
- **Declared accuracy:** ±6 dB ±0.02 V/m across the stated band — Manufacturer figure, not an independent verification.
- **Market status:** Currently sold

## Frequency coverage by mode

One band per measuring mode, as the manufacturer states it.

- **power density** — 200 – 8,000 MHz, ±6 dB ±0.02 V/m
- **electric field strength** — 200 – 8,000 MHz, peak display in V/m

## Display range by mode

- **Peak field strength** — 0.02 – 10.00 V/m (resolution 0.01 V/m displayed)
- **Average power density** — 0.1 – 250,000 µW/m²

## Calibration

Manufacturer-stated factory calibration with a five-year return-to-base warranty; no accredited calibration certificate is advertised.

## Suited to

- Separating pulse peaks from time-averaged exposure, which is the distinction most exposure limits are written on: the average display is a true rolling mathematical average, not a peak scaled down
- Recognising DECT, Wi-Fi, GSM and TETRA by their sound signature
- Very low-level work: the manufacturer states audio is audible below 0.02 V/m

## What it cannot do

- No low-frequency magnetic or electric field capability at all
- Nothing above 8 GHz — mmWave 5G is out of band
- Single-axis with a directional case: the manufacturer states it under-reads when the source is in front of the display, so orientation matters
- No numeric spectrum or frequency readout, so source attribution is by ear and by elimination
- No logging or PC output

## What these figures are

Every number on this page is the manufacturer's own declared specification, reproduced so that models can be compared field by field. Nothing here is an independent test of the instrument, a calibration certificate, or a statement that a reading taken with it can be compared with a regulatory limit — that depends on the detector, the averaging and, where it matters legally, an accredited calibration.

## Related records

- [Broadband RF power-density meter](https://emfbase.com/meters/broadband-rf-meter): The general-purpose instrument for Wi-Fi, cellular, 5G, smart meters and cordless phones: reports total power density across a wide band in µW/m² or mW/m², with peak-hold and average modes.
- [RF room survey](https://emfbase.com/protocols/rf-room-survey): How to measure radiofrequency exposure in a room so the result is reproducible: peak and average, at body positions, with the dominant direction identified.
- [Averaging time](https://emfbase.com/glossary/averaging-time): Regulatory limits apply to an average: 30 minutes for the general public under FCC and ICNIRP rules, 6 minutes for occupational exposure.
- [Electric field strength](https://emfbase.com/quantities/electric-field-strength): Volts per metre, reported both for power-frequency electric fields near wiring and for radiofrequency fields near transmitters.

## Sources

- `emfields-am11` EMFields Solutions Ltd, United Kingdom. *AM11 Acoustimeter — specifications*. https://www.emfields-solutions.com/products/am11-acoustimeter.asp — manufacturer, link checked 2026-08-12

Data licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Dataset version 2026.08.1. Retrieved from EMFBase, https://emfbase.com.

This record is reference data, not medical or legal advice. Regulatory limits, scientific guidelines and precautionary values are labelled separately and answer different questions.