- Joined Nov 5, 2011
I'm beginning to work with oscilloscopes and a function generator at my school. Of course, because we're new students, it's kind of basic tutorial type instuction. One thing I'm having trouble with is how to calculate the internal resistance of the function generator by using a 10kΩ load (and various others one at a time: 1k, 470, 100) connected between it and the oscilloscope. We have it set up where the minimum output of the function generator shows a 2V p-p when using the 10k load. I know it says right on the face of the unit itself (50), but we have to show calculations and how we were able to determine the value of the internal resistance. I was thinking that the Voltage Divider equation using the different values we're working with and an assumed value internally for the function generator would be sufficient. And that trial and error with different values would eventually find the Ir. However, any time I try making calculations it always seems to not make sense. If anyone would be able to help me with this, I'd greatly appreciate it.