Does anyone here know why a function generator would output a sine wave that is very "bouncy". By being bouncy i mean the amplitude of the sine wave is constantly changing from 2.8 volts to 3.2 volts to 3 volts almost every second.
I am performing a simple low pass and high pass ac filter experiment in my home and am worried the numbers might be way off due to this phenomenon.
What can i do to fix this problem? Thank you for all the replies.

 

How do you measure the amplitude?

 

Could be as simple as a crusty solder joint.

 

How do you measure the amplitude?

i have a Digital oscope that does it for me.

 

If you know enough to be safe about it, open up the case and start poking things with a plastic rod. Tap the board or case and see if it responds to vibration. Only if that fails, start measuring to see where the instability resides.

 

Is there a potentiometer that controls the amplitude? If so, look for a 'flaky' pot.

 

Where is the sinewave coming from? A LP&HP filter combination by itself does not make sines. What is the source? Maybe it's bobbling up and down.
The LP and HP are in series, can you divide and conquer?