dBV, dBmV, dBuV, dBnV Converter

This tool converts between any of the following deciBel Volt (dBV) units:

  • dBV
  • dBmV
  • dBµV
  • dBnV

To use the converter,

  • In the input area, enter the value and the unit using the drop down menu
  • Select the output units

This converter can also be used to convert units of Electromagnetic Field Strength. For example: dBV/m to dBµV/m.

Formula

  • dBmV = dBV + 60
  • dBµV = dBV + 120
  • dBnV = dBV + 180

Example Calculations

  • 10 dBV = 70 dBmV
  • 20 dBV = 200 dBnV
  • 50 dBµV/m = -70 dBV/m

Background

dBV stands for “decibels relative to one volt” and is a unit of measurement used to express voltage levels or voltage ratios on a logarithmic scale. dBV quantifies the ratio of a voltage level to one volt (1 V) as a decibel value.

It is commonly used in electronics, audio engineering, and telecommunications to describe voltage levels and signal amplitudes.

The formula for calculating dBV is as follows:

dBV = 20 * Log10(V / 1 V)

In this formula:

  • dBV represents the voltage level in decibels relative to one volt.
  • V is the actual voltage level that you want to express in dBV.

Similarly

  • dBnV = 20 * Log10(V / 1 nV)
  • dBµV = 20 * Log10(V / 1 µV)
  • dBmV = 20 * Log10(V / 1 mV)

where

  • 1 nV = 10-9 V
  • 1 µV = 10-6 V
  • 1 mV = 10-3 V

Examples:

  • 0 dBV represents 1 volt (1 V) of voltage.
  • 20 dBV represents 10 volts (10 V) of voltage.
  • -20 dBV represents 0.1 volts (0.1 V) of voltage.

dBV is a valuable tool for engineers and technicians working with electronic and audio systems because it simplifies the representation and comparison of voltage levels, particularly when dealing with signals of varying amplitudes and power levels.

dBV/m provides a logarithmic representation of the Electric Field Strength, making it easier to compare and analyze measurements over a wide range of field strengths.

It is commonly used in the field of radio frequency (RF) engineering and EMC testing to assess the levels of electromagnetic interference (EMI) or radiation generated by electronic devices and equipment. It helps determine whether the emissions from a device comply with established EMC standards and regulations.

The table below shows emission limits in dBuV/m of field strength.

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