 Note that video signals use the "IRE" unit instead of DC voltages to describe levels and amplitudes.Based on a standard 1 Vpp NTSC composite-video signal that swings from -286 mV (sync tip) to +714 mV (peak video), a 140 IRE peak-to-peak convention is established.One NTSC IRE unit is 7.14mV, where -40 IRE is equivalent to -286 mV, and +100 IRE is equivalent to +714 mV.