# How do I Calculate the Ratio of Two Voltages in Decibels Using the DLM2000 Mixed Signal Oscilloscope User-Defined Math?

#### Resources:

For the DLM2000 Mixed Signal Oscilloscope with user-defined math (G2 Option), you can calculate the ratio of two voltages in decibels. The formula for calculating the ratio of two voltages in dB is:

dB = 20*Log(Voltage1/Voltage2)

Follow the procedures listed below to perform the calculation:

1. Press MATH/REF » Mode » Math1 soft buttons to select CH1 math
2. Press Operation » User Define soft buttons to set the operation to user defined math
3. Press Expression soft button and enter the formula:
20*LOG(P.RMS(C1)/P.RMS(C2))
4. Press Enter to confirm the expression

Please view the attached file for an example screenshot and the calculation result.

#### DLM2000 Mixed Signal Oscilloscopes

200, 350, and 500MHz mixed-signal oscilloscopes for every engineer. Best-in-class performance in usability, acquisition, analysis, and display—all at a price you can digest. Options include serial bus, vehicle bus, and power supply analysis functions.

#### Mixed Signal Oscilloscopes

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