moderate frequency ( factor A ( II ) , 10 ( 4 ) Hz ) and high frequency ( factor A ( III ) , 10 ( 3 ) Hz ) ; pulse amplitude ( factor B ) included 0-30 V ( factor B ) , 0-60 V ( factor B ( II ) ) and 0-90 V ( factor B ( III ) ) ; pulse width ( factor C ) included 0.1 ms ( factor C ( I ) ) .