SPA4400 HandHeld Spectrum Analyzer 35MHz·4400MHz

Usage of SAP4400 spectrum analyzer: The knob on the right has two functions: press and rotate. Rotate to change the position or value, and press to confirm. You just need to change the start frequency. Start is the start frequency, stop is the end frequency. State red represents the test state, and green represents the editing state. After all edit, the state should be set to red, and the device starts testing.