Simscape Spectrum Scope of AC Voltage Source amplitude is too large?

Hi,

I am using simscape components to simulate a simple circuit. Picture: http://imageshack.us/photo/my-images/62/circuitn.jpg/. The voltage source has a 320V peak amplitude with zero phase shift at 50Hz. My resistor is 170Ohms.

For some reason when I look at the amplitude of the frequencies of the voltage, the amplitude of the voltage is approximately 100 times that of the voltage source. Picture: http://imageshack.us/photo/my-images/850/graphsw.jpg/. So although my voltage source amplitude is 320V peak, the spectrum shows an amplitude of approximately 40,000V.

Can anyone give me an idea why this is happening?

Thanks,

Paula