Voltage converter (conducted emission)

Instantly convert between V, mV, µV, dBV, dBmV and dBµV voltage units for conducted emission testing.

VmVµVdBVdBmVdBµV

Formulas

dBµV = 20·log₁₀(V) + 120

dBV = 20·log₁₀(V)

dBmV = 20·log₁₀(V) + 60

1 V = 10³ mV = 10⁶ µV

Voltage dB values reference 1 µV (dBµV) or 1 V (dBV). CISPR conducted-emission limits are almost always expressed in dBµV.

Enter one value and instantly get all six units: V, mV, µV, dBV, dBmV and dBµV, with no manual arithmetic.

All formulas use the 20·log₁₀ amplitude convention, matching CISPR 16-1-1 receiver readings.

Parameters sync to the URL automatically, so you can copy a link to share with colleagues or paste into a test report.

1 Type a known value into any unit field (for example 60 in the dBµV box).
2 The other five fields update in real time with the converted values.
3 Click "Share link" to copy the current conversion state to your clipboard for archiving.

› Conducted-emission testing: convert receiver dBµV readings into volts to estimate actual port voltage.
› Pre-compliance checks: switch between dBµV and mV to compare measurements against design targets.
› Report writing: produce the same field strength in multiple units quickly, avoiding hand-calculation errors.

What is the offset between dBµV and dBV?

120 dB. dBµV references 1 µV, dBV references 1 V, and 1 V = 10⁶ µV, so dBµV = dBV + 120.

Why do CISPR limits use dBµV instead of volts?

EMC measurements span many orders of magnitude (µV to V). The logarithmic dBµV keeps numbers compact and overlays neatly on spectrum plots.

Are negative dB values meaningful?

Yes. A negative dBµV means the voltage is below 1 µV, common with sensitive receivers or well-shielded setups.