1) Static: The change in output voltage as the load is changed from specified minimum to maximum and maximum to minimum, with all other factors held constant. 2) Dynamic: The change in output voltage expressed as a percent for a given step change in load current. Initial and final current values and the rates of change must be specified. The rate of change shall be expressed as current/unit of time, e.g., 20 amperes A/µ second. The dynamic regulation is expressed as a ± percent for a worst case peak-to-peak deviation for dc supplies, and worst case rms deviation for ac supplies.