Saul,
Before jumping into sweep calibration, it is best to know some details about the accuracy of available signals.
What is the source of the 24 MHz signal? How accurate is this signal? Is it crystal controlled?
And the same about your function generator - how accurate is this? Is it synthesized or free running? Do you have a frequency counter?
Also, I see from your posts that you are having difficulty measuring time with an oscilloscope. What is to the left of the first vertical line is not counted.
Go back to the 24 MHz signal as shown in the photo with red arrows.
Position the bottom peak of the first cycle exactly on the first vertical display line.
Move the vertical position up so the bottom peaks are on the center line.
Count 12 bottom peaks and read the scale.
From the photo, this looks like 9.5 or 9.6 divisions.
How many divisions do you measure?
Now turn the sweep vernier from right to left.
Do you see many more cycles?
Turn the sweep vernier to the right (CAL position).
Does bottom peak 12 return to the same position?
RF+ Tech