Features:

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. In attenuation mode, the maximum measurement upper limit is approximately +50 dBm, with no signal saturation or distortion. In gain mode, the lowest measurable value is -70 dBm. It can measure milliwatt-level equipment in the UV band, tens of watts of transmission systems, and complex electromagnetic environments in the HF band. This helps engineers accurately measure field strength, evaluate signal coverage and transmission performance.

2. Frequency range: 0.5 MHz to 5 GHz:

By replacing the corresponding antenna, you can measure the field strength from low-frequency magnetic fields to the microwave frequency band. It can also be used to measure the power frequency magnetic field around household sockets. It is suitable for electromagnetic exploration. (Note: The default accessory antenna is at a frequency of 433 MHz; when testing other frequencies, please prepare your own antenna and test with an antenna that resonates with the measurement frequency for better results)

3. Graphical interface and four display modes:

The graphical menu provides intuitive operation. It includes four display modes: digital mode (for precise reading), pointer mode (for displaying signal fluctuations), curve graph mode (for observing trend changes), and recorder mode (for recording the maximum values during the measurement period). During outdoor testing, antenna debugging, or interference troubleshooting, it is possible to lock onto the instantaneous peak, quickly identifying the optimal antenna direction or the position 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 (160×128 pixels). Supports daytime mode (highly visible in outdoor conditions) and nighttime mode (soft light). The screen orientation can be freely switched, either in landscape or portrait mode.

5. Compact and portable, with built-in long-lasting battery:

Highly integrated design, with a small body that can fit in a pocket. Equipped with an 800 mAh battery, it can support continuous testing for over half a day after a single charge. Suitable for mobile scenarios such as tower top debugging and on-site troubleshooting.

6. USB Type-C interface, supporting charging and firmware upgrade:

It adopts the standard USB Type-C interface, supporting 5V/1A charging, and is compatible with most mobile phone chargers and power banks. As a firmware upgrade interface, no dedicated programmer is required. Refer to the user manual for guidance and connect to the computer to update the firmware.

 

Parameters:

- Model: ATR-FSM 

- Frequency range: 0.5 MHz to 5 GHz

- Sensitivity range: +50 dBm to -70 dBm

- Settings: Attenuation approximately 20 times / Gain approximately 20 times

- ADC: 16-bit high resolution

- MCU: ESP32 240 MHz

- Antenna interface: SMA-KE

- Battery capacity: 800mAh

- Charging interface: USB Type-C 5V/1A (Not supporting fast chargers)

- Display screen: 1.8-inch high-quality full-color screen (Resolution: 160x128px)

- System language: English

- Appearance size: 6.4cm x 4cm x 1.6cm
 

Notes:

1. Receiving antenna: Please have the user prepare the corresponding receiving antenna according to the signal frequency 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 applicable to the 433MHz frequency band. If you need to test other frequencies, please purchase the corresponding antenna by yourself and pay attention to confirming whether the antenna interface is compatible with the equipment.

2. Measurement distance: During measurement, please ensure that the transmitting antenna and the ATR-FSM maintain 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 normally.

3. Measurement gear: Before measurement, set the equipment to the attenuation gear 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.

 List:

1 * ATR-FSM main unit

1 * 433 MHz antenna (only for U-band testing)

1 * SMA-JJ adapter (makes it convenient for you to connect antennas of different interfaces.)

1 * USB TYPE-C data cable

1 * Instruction manual