© National Instruments Corporation 23 USB-6008/6009 User Guide and SpecificationsI/O connectors ........................................ USB series B receptacle,(2) 16 position terminal blockplug headersWeightWith connectors .............................. 84 g (3 oz)Without connectors ......................... 54 g (21 oz)Screw-terminal wiring............................ 16 to 28 AWGTorque for screw terminals .................... 0.22 to 0.25 N · m(2.0 to 2.2 lb · in.)SafetyStandardsThe USB-6008/6009 is designed to meet the requirements of the followingstandards of safety for electrical equipment for measurement, control, andlaboratory use:• IEC 61010-1, EN 61010-1• UL 61010-1• CAN/CSA-C22.2 No. 61010-1Note For UL and other safety certifications, refer to the product label, or visitni.com/certification, search by model number or product line, and click theappropriate link in the Certification column.VoltagesConnect only voltages that are within these limits.Channel-to-GND .................................... ±30 V max,Measurement Category IMeasurement Category I is for measurements performed on circuits notdirectly connected to the electrical distribution system referred to asMAINS voltage. MAINS is a hazardous live electrical supply system thatpowers equipment. This category is for measurements of voltages fromspecially protected secondary circuits. Such voltage measurements includesignal levels, special equipment, limited-energy parts of equipment,circuits powered by regulated low-voltage sources, and electronics.Caution Do not use this module for connection to signals or for measurements withinMeasurement Categories II, III, or IV.