ATR-FSM Portable Field Strength Meter 0.5MHz-5GHz +50dBm~-70dBm Gain Switchable RF Signal Detector
Summary:
ATR-FSM is a handheld field strength meter. It is suitable for radio enthusiasts, antenna debugging engineers, interference troubleshooting personnel, electromagnetic environment assessment personnel, and users who wish to visually observe electromagnetic fields. The product is small and portable, providing an intuitive field strength measurement experience. Key features include: wide frequency band coverage, wide measurement range, intelligent recording function, and portability. This device supports various application scenarios and is more playable, and can be used to measure the signal strength of antenna reception, compare the reception effects of different antennas, test the radiation intensity of transmitters, verify the actual radiation performance of antennas, and measure the polarization direction of receiving antennas at different spatial positions and angles.
Product Advantages:
1. Wide range of field strength measurement, covering both strong and weak signals
Built-in hardware-level attenuation (approximately 20 times) and gain (approximately 20 times) switching functions. In attenuation mode, the maximum measurement upper limit is approximately +50 dBm, ensuring no signal saturation and no distortion; in gain mode, the lowest measurable value is -70 dBm. This device can be used to measure milliwatt-level equipment in the UV band, tens of watts of transmission systems, as well as complex electromagnetic environments in the HF band. It helps engineers accurately measure field strength and complete the evaluation of signal coverage and transmission performance.
2. Frequency range: 0.5 MHz to 5 GHz
After replacing the corresponding antenna, the field strength from low-frequency magnetic fields to the microwave frequency band can be measured. It can also be used to measure the power frequency magnetic field around household sockets, suitable for daily field strength measurement and electromagnetic exploration work. Please note: The default accessory antenna equipped with the device is at a frequency of 433 MHz; when testing other frequencies, users need to prepare their own antennas and use antennas that resonate with the measurement frequency to improve the test effect.
3. Graphical interface and four display modes
The interface is designed with graphical menus, making the operation intuitive and easy to understand. The device is equipped with four display modes, namely: digital mode (which can display precise readings), pointer mode (which can show signal fluctuations), curve graph mode (which can observe signal trend changes), and recorder mode (which can record the maximum signal value during the measurement period). In outdoor testing, antenna debugging, or interference troubleshooting scenarios, it can lock on the instantaneous peak of the signal, helping to quickly identify the optimal antenna direction or the location of the strongest signal.
4. Full-color high-definition screen, suitable for both day and night use and various holding directions
Equipped with a 1.8-inch full-color screen with a resolution of 160Ă—128 pixels. The screen supports switching between daytime and nighttime modes. The daytime mode ensures clear visibility in high outdoor brightness environments, while the nighttime mode has soft lighting to avoid harsh glare; it also supports free screen orientation adjustment, allowing for normal use in both horizontal and vertical holding positions.
5. Compact and portable, with built-in long-lasting battery
With a highly integrated design, the device is small and can be easily placed in a pocket, making it convenient to carry. It is equipped with an 800mAh battery. After being fully charged, it can support continuous testing for more than half a day, suitable for tower-top debugging, on-site interference排查， and other mobile testing scenarios.
6. USB Type-C interface， supporting charging and firmware upgrade
It adopts a standard USB Type-C interface， supporting a 5V/1A charging specification， which is compatible with most mobile phone chargers and power banks. The charging is convenient. This interface can also serve as a firmware upgrade interface. No special programmer is required. Users can complete the firmware update operation by connecting the device to a computer according to the instructions in the user manual.
Parameters:
– Model: ATR-FSM (with 3D printed casing)
– Frequency range: 0.5 MHz to 5 GHz
– Sensitivity range: +50 dBm to -70 dBm
– Ranges: Attenuation approximately 20 times / Gain approximately 20 times
– ADC: 16-bit high resolution
– MCU: ESP32 240 MHz
– Antenna interface: SMA-KE
– Battery capacity: 800 mAh
– Charging interface: USB Type-C 5V/1A (does not support fast charger)
– Display screen: 1.8-inch high-quality full-color screen (resolution: 160x128px)
– System language: English
– Appearance size: 6.4 cm x 4 cm x 1.6 cm
– Weight: Approximately 45 g
Notes:
1. Receiving Antenna: Please have the user prepare the corresponding receiving antenna according to the frequency of the signal to be measured. Using an antenna that does not match the measurement frequency will significantly reduce the test effect. The antenna included randomly with the equipment is only suitable for the 433MHz frequency band. If you need to test other frequencies, please purchase the corresponding antenna by yourself and make sure that the antenna interface of the antenna matches the equipment.
2. Measurement Distance: During measurement, please ensure that the transmitting antenna and the ATR-FSM are kept at a distance of at least 50cm or more. When measuring, the antenna of ATR-FSM should be kept at least one wavelength away from the transmitting antenna. If the distance is too close, strong signals may permanently damage or even burn out the internal components of ATR-FSM, or cause ATR-FSM to fail to work properly.
3. Measurement Range: Before measurement, set the equipment to the attenuation range to prevent sudden excessive signal strength from damaging the ATR-FSM. Pay attention to observing the signal strength value at all times. Do not continuously exceed the maximum range of 90%, otherwise it may permanently damage the ATR-FSM.
4. Charging Method: Fast charging adapters are not supported. Fast charging may damage the battery. Please use a normal slow charging adapter. If not using for a long time, keep the battery at 50% charge to avoid damaging the battery.
Delivery List:
1 * ATR-FSM Main Unit
1 * 433 MHz Antenna (Only for U-band testing)
1 * SMA-JJ Converter Head (Helps you connect antennas of different interfaces.)
1 * USB TYPE-C Data Cable
1 * Instruction Manual
