What is the bottom frequency on the oscilloscope?

tsvigo

Here is the photo of a measurement:

On the right frequency is measured with a cable such as. And what is the frequency from below?

amy

Sir, the measurement function is calculated using the data displayed on the screen.
The frequency on the lower right corner of the screen is calculated by the FPGA sampling data.
If the periodic waveform is not displayed on the screen, the frequency value of the measurement function is not accurate.