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National Instruments 777687-27 High-Voltage Attenuator Terminal Block

The part number 777687-27 from National Instruments is the identifying part number for the SCXI-1327 High-Voltage Attenuator Terminal Block.  The 777687-27 high-voltage attenuator terminal block is shielded and has screw terminals that connect to the SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, or SCXI-1126 input connector. Each 777687-27 High-Voltage Attenuator Terminal Block channel has a precision 100:1 resistive voltage divider that you can use to measure voltages of up to 300 Vrms or ±300 VDC with the SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, or SCXI-1126. You can individually bypass these dividers for low-voltage measurement applications. 

The terminal block has 18 screw terminals for easy signal connection. One pair of screw terminals connects to the SCXI-1120, SCXI-1120D, SCXI-1121, SCXI-1125, or SCXI-1126 chassis ground. When used with the SCXI-1120, SCXI-1120D, SCXI-1125, or SCXI-1126, the remaining eight pairs of screw terminals connect signals to the eight module inputs. When used with the SCXI-1121, four pairs of SCXI-1327 screw terminals connect signals to four module inputs and the remaining four pairs of SCXI-1327 screw terminals connect signals to four module excitation outputs.

When connecting or disconnecting signal lines to the 777687-27 terminal block screw terminals, make sure the lines are powered off. Potential differences between the lines and the SCXI ground can create a shock hazard while you connect the lines. Connections, including power signals to ground and vice versa, that exceed any of the maximum signal ratings on the SCXI device can create a shock or fire hazard or can damage any or all of the boards connected to the SCXI chassis, the host computer, and the SCXI device.

This terminal block has dimensions of 17.8 by 7.94 by 3.0 cm and weighs 200 g (7 oz). The terminal must be operated in an environment with an ambient temperature of 0 to 50 °C, while it can be stored in an environment with a temperature of –20 to 70 °C. The 777687-27 High-Voltage Attenuator Terminal Block is designed in accordance with IEC 61010-1, UL 3111-1, and CAN/CSA C22.2 No. 1010.1 for electrical measuring and test equipment. It has Installation Category II and Pollution Degree 2