The method of frequency stability detection of micro-power (short-range) radio transmission equipment mainly involves the measurement of the transmission frequency of the equipment in the working state and the evaluation of frequency stability under different environmental conditions (such as temperature, humidity, and voltage changes). The following are some specific detection methods:

I. Basic test steps
Equipment preparation: Make sure that the device under test is in normal working condition and connected to the test system. The test system usually includes instruments such as spectrum analyzer, signal generator, power meter, etc.
Set test parameters: Set the center frequency, scanning range, resolution bandwidth, and other parameters of the test system according to the specifications and requirements of the device under test.
Frequency measurement: Under normal working conditions, use the test system to measure the transmission frequency of the device under test and record the measurement results.
Changes in environmental conditions: By changing the power supply voltage, ambient temperature, and other conditions, simulate various situations that the device may encounter in actual use.
Frequency stability evaluation: Repeat the frequency measurement under different environmental conditions and calculate the frequency offset. The frequency offset refers to the difference between the frequency measured under different conditions and the frequency measured under normal working conditions.
II. Specific detection methods
Spectrum analyzer measurement method: Use an RF or microwave spectrum analyzer to directly measure and display the RF power spectrum of the device under test.
By observing the signal peak on the spectrum graph, the transmitting frequency of the device can be read.
Repeat the measurement under different environmental conditions and calculate the frequency offset.
Counter measurement method:
Use a general counter to measure the multiplied frequency signal.
By calculating the frequency values ​​in different sampling times, the frequency stability of the device can be evaluated.
This method is usually used to measure short-term frequency stability (sampling time is less than 10 seconds).
Allan variance method:
Allan variance is a statistical method to describe frequency stability.
By measuring the frequency values ​​in multiple sampling times and calculating the variance of these frequency values, the Allan variance value can be obtained.
The smaller the Allan variance value, the higher the frequency stability of the device.
III. Precautions
Test environment: The test should be carried out in a shielded room or similar environment to reduce the influence of external interference on the measurement results.
Test instrument: The test instrument should have high precision and stability to ensure the accuracy of the measurement results.
Test method: The test method should meet the requirements of relevant standards and specifications to ensure the reliability and validity of the test results.
Data processing: Properly process and analyze the measured data to obtain accurate frequency stability evaluation results.
In summary, the frequency stability detection method of micro-power (short-range) radio transmission equipment includes basic test steps, specific detection methods and precautions. Through reasonable test methods and accurate measurement data, it is possible to evaluate whether the frequency stability of the equipment meets the requirements, thereby ensuring the normal operation of the equipment and the communication quality.