LoRa module performance test - sensitivity

Sensitivity is a very important parameter in the LoRa module. In the field of wireless communication, the receiving sensitivity is like human hearing. Increasing the signal receiving sensitivity can make wireless products have a stronger ability to capture weak signals. When the transmission distance is farther, the signal will be weaker. At this time, the LoRa module with high sensitivity can also receive data stably. Therefore, when the receiving sensitivity is higher, the transmission distance is farther. Today, NiceRF Wireless will show you how to test the sensitivity of the LoRa module, hoping to give you a better understanding of our products.

1. LoRa module to be tested

（LoRa module LoRa1276F30）

2. Required tools and instruments

High frequency signal generator, DC power supply, oscilloscope, electrostatic hand strap, ammeter, product function test stand

（High frequency signal generator）

（DC power supply）

（Oscilloscope）

（Product function test stand）

3、Test steps of LoRa module

3.1. Put on an electrostatic bracelet and set the power supply voltage to 5V.

3.2. Set the center frequency of the high-frequency signal generator to the working frequency of the current module. See the table below for specific settings.

3.3. Set the voltage scale of the oscilloscope to 2V and the time scale to 2ms.

3.4. Set the frequency of the test DEMO board to be consistent with the frequency of the instrument, and set the test mode to RX TEST. Connect the probe of the oscilloscope to the DIO2 output pin of the LoRa module LoRa1276F30. The frequency is 1.2KHz and the voltage amplitude is about 3V. Square wave signal, and the waveform must not be jittery, see the picture in the illustration for details.

（The probe of the oscilloscope is connected to the DIO2 output pin of the LoRa module LoRa1276F30）

（The oscilloscope must display a square wave with a frequency of 1.2KHz to qualify）

3.5. First check whether the receiving current of the LoRa module LoRa1276F30 is within 14mA, and then put the LoRa module LoRa1276F30 into sleep mode. The sleep current of the LoRa1276F30 module should be within 10uA. Is qualified

（Measured receiving current）   

（Measured sleep current）

3.6. If the test results cannot meet the test indicators of items 4 and 5, it is a substandard product, and the substandard product needs to be repaired or eliminated.

4. LoRa module test process precautions

①The power connection of the DC power supply and the test fixture cannot be reversed, and the DC power supply voltage cannot be adjusted arbitrarily after setting.

②The parameters of the high-frequency signal generator cannot be changed casually.

③The power supply and the instrument must be reliably grounded.

Today’s LoRa module receiving sensitivity test is here. If you don’t understand or need to know, please feel free to contact NiceRF.