An ON time (Ton2) is calculated by subtracting the ON time (Ton1) from a fixed switching period (Ts) (Step S104').

The conduction time may be reduced proportionally to the excess current.

The calibration device comprises a switching device (10) which, with a ratio of conducting time to non-conducting time, influences the mean current in the current path.

AV nodal conduction time is unchanged or shortened and His-Purkinje conduction time is unchanged.

AV nodal conduction time is unchanged or shortened, and His-Purkinje conduction time is unchanged.

A user-adjustable timing circuit controls the conduction time of the triac from a minimum time to a maximum time.

The maximum possible conduction time of the triac is the high-end trim.

The minimum possible conduction time of the triac is the low-end trim.

A conduction time of one or more transistors is reduced during the over current condition.

Effects upon atrioventricular (AV) nodal conduction time and intra-atrial conduction times, although present, are less pronounced than those on ventricular conduction velocity.

Changes in conduction velocity may be monitored based on conduction time between electrodes positioned in the left and right ventricles of the heart.

The non-capacitive impedance means is adapted to increase conduction time of input current drawn from the AC supply.

The conduction time is reduced in an amount that is an increasing function of the amount of the over current.

The boosted voltage allows higher efficiency illumination lamps to be used, and regulation of the conductive time interval achieves the optimal current conduction through the lamp.

The winding is excited in advance of zero- crossings of back EMF by an advance period and is excited for a conduction period over each electrical half-cycle of the motor.