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biff44 said:Depends. If you are measuring voltages or phase noises, use 'Log mag' = 20 Log ('Lin Mag').
If you are measuring power, 'Log Mag' = 10 Log ('Lin Mag')
Ex: 0.1 mW is the same as 10 Log (0.1 mw/1 mw) = -10 dBm
or
0.2 volts is the same as 20 Log (0.2v/1 v) = -13.9 dbv
yours said:biff44 said:Depends. If you are measuring voltages or phase noises, use 'Log mag' = 20 Log ('Lin Mag').
If you are measuring power, 'Log Mag' = 10 Log ('Lin Mag')
Ex: 0.1 mW is the same as 10 Log (0.1 mw/1 mw) = -10 dBm
or
0.2 volts is the same as 20 Log (0.2v/1 v) = -13.9 dbv
I think there is something wrong. Measuring power is 20log().
Measuring voltages is 10log().