I am trying to do a simple experiment involving an ocilliscope and a function generator in the same circuit. My plane is to have the function generator set to produce a 10V (no load) sine wave an vary the freq from 100-2700 Hz.
A .1 uf capactictor and a 1K resistor are connected in series across the output leads of the function generator. I want to connect the ocilliscope leads across the resistor to measure the voltage drop across the resistor. I calculate that the voltage drops should range between .6V and 8.6V using the above frequencies.
Scope: Tektronix D10 5103 Function Generator: MCP SG1639A
The problem that I am having is that I think that the scope and function generator share a common ground because as soon as I connect the positive leads of the scope and function generator together (without connecting the ground leads together) I get a wavefrom on the scope that represent the 10V sine wave. If I connect both leads of the scope probe across the resistor I get the same 10V sine wave signal not the .6V AC signal. Why are the gound test leads of the scope anf freq generator common. I can't see any switch on the function generator to control this.
Is my assumption about the common ground correct? Do I need to connect the scope or function generator to an isolation transformer?
Also, is it safe to short the output leads of the function generator together.
Any help would be greatly appreciated. Thanks