Measure chassis leakage current to ground with the conductor of plug-connected grounding temporarily opened. Operate the equipment oximeter in all normal modes, including on, standby, and off, and record the maximum leakage current. Chassis leakage current to ground should not exceed 300 A. Preventive Maintenance Clean. Clean the exterior, if needed. Before Returning to Use Make sure that all controls are set properly. Set alarms loud enough to alert personnel in the area in which the oximeter will be used. Other controls should be in their normal pre-use positions.