Instead of getting a frequency generator, I opted to use the one inside of my oscilloscope. It only goes up to 25MHz and only for sine waves.

I thought, "I'll get a frequency multiplier and multiply the signal." Now I have read about multipliers here: https://adsantec.com/a-basic-introduction-to-frequency-multipliers/ , so it's not like I'm just guessing what they do.

I bought this one: Frequency Multiplication 2~50MHz Clock Multiplier Frequency Multiplication Module as it fits well within what my oscilloscope can do and can multiply the signal quite a bit.

I attached it to my oscilloscope, turned the oscilloscope's signal generator to 1MHz sine wave, and connected my 10x probe that came with the oscilloscope.

I got a square wave...

I turned the frequency up to 25Mhz, and I got something that looked like a square wave...

I don't understand. I expect a sine wave out when I put a sine wave in. I expect a square wave out when I put a square wave in. I expect a saw wave out... etc., etc., etc...

What's going on?

Is this how frequency multipliers are supposed to work?

Thanks!

Pictures below:

PS: I just chose channel 4 because I liked the color.

PPS: The scope is calibrated and the probe has been compensated.