... tube; they have the functions of automatic/manual, constant speed control, fixed points/continuous measurement, automatic depth modification, and alarm ... borehole. I. Main technical specification and parameters 1. JCH-1000 Automatic Cable Winding Winch(1) Speed range: 0~30 ... ;(8) Power supply: AC 220V±10%, 50 Hz; JCH-1000 Automatic Constant Speed Controlling Fixed Point Measurement Cable Winding Winch