I was using a signal generator to perform some tests. The circuit was simply the generator in series with a 1 ohm shunt resistor. Even though I was working with high frequencies (1 to 20 MHz), shouldn't the voltage drop across the resistor be the generator amplitude itself? I was using the maximum voltage (10 Vp), but the voltage across the resistor was around 1 V or so. I measured its resistance and it was really 1 ohm.