Select the [SCENE FILE SETTINGS] menu → [BLACK] → [M.PED]/[R PED]/[G PED]/[B PED].
[M.PED] (master pedestal): Adjusts the reference black level of the whole video. The adjusted value is maintained even when the auto black balance is executed.
[R PED] (red signal pedestal), [G PED] (green signal pedestal), [B PED] (blue signal pedestal): Adjusts the reference black level for each signal. Depending on the setting in the [SCENE FILE SETTINGS] menu → [BLACK] → [PEDESTAL OFFSET], it can be set if the adjusted value is to be maintained or not when the auto black balance is executed.