Ok I found it but I don't seem to understand what frequency is to be set.
when I enter the calibration mode and the oscillator indicates 10MHZ I connected my ch1 to the oscilloscope and using the counter function it indicated about 60MHZ (60000025 Hz ) so should I set the 10MHz in the FY6800 to the exact frequency measure by the counter?
thank you
I have an FY6600 Ver 3.3 and this is the procedure that worked for me:
1. Enter the calibration mode by pressing and holding STBY button and CH1 at power up
2. Set CH1 frequency to 10MHz
3. Go to the adjustment menu (SYSTEM, MORE, OSC)
3. Move the cursor to the right to reduce the frequency step
4. Adjust the frequency until your frequency counter reading is 10MHz
5. Long press the encoder to save the new setting. In your case is probably the OK button
I bet you know already, the oscilloscope is not an accurate frequency counter by any mean, not enough to do frequency calibration anyway.