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E8257D AM modulation depth conversion from dB to

Question asked by timh13 on Jul 11, 2014
We are using an Agilent E8257D Signal Generator for an AM modulated signal.  Our in-house software functions will only allow us to program the E8257D AM depth in dB/volt format but our UUT test specifications require AM depth in percent/volt.  I can't seem to find a mathmatical relationship between the percent and dB AM depth settings for this instrument.  I thought that it would be something like dB = 20*log(1-M/100), where M = degree of modulation in %.  After experimenting with the instrument output in both formats, I cannot find a conversion formula that produces the same modulated signal in both formats.

Any help would be appreciated.