The National Instruments 777459-18 is a Resistance Temperature Detector (RTD) Input Module, designated as the SCC-RTD01. This module is equipped with two differential analog input channels, each with an input range of ±400 mVDC and a fixed gain of 25. It has an input impedance of 2 MΩ in parallel with 4.7 nF during normal operation and a minimum of 20 kΩ when powered off or in an overload condition. The module integrates a 3-pole Butterworth lowpass filter with a -3 dB cutoff frequency of 30 Hz, supporting connections for up to two RTD input signals from 2, 3, or 4-wire configurations. Weighing just 24 g (0.8 oz), the 777459-18 can accommodate field-wiring diameters ranging from 28 to 16 AWG and features a 20-pin right-angle male connector along with a 6-pin screw terminal for I/O connections. Each input is designed to maintain a maximum working voltage (signal plus common mode) within ±12 V of ground, and the amplifier boasts a common-mode rejection ratio of 110 dB at 60 Hz, with an output range of ±10 V. The module includes a single excitation channel with a constant-current source output of 1 mA, ±0.4 μA. Power requirements specify a maximum analog consumption of 135 mW (4.5 mA at ±15 V) and a maximum digital consumption of 153 mW (30.6 mA at +5 V). The recommended operating temperature range is 0 to 50 °C with a relative humidity of 5 to 90%, while it can be stored at temperatures between -20 to 70 °C. Designed for indoor use only, the module should be mounted within a sealed enclosure if used in outdoor environments, and it operates effectively at altitudes up to 2000 m. Additionally, the 777459-18 complies with safety standards for electrical equipment for measurement, control, and laboratory applications, including IEC 61010-1, EN 61010-1, UL 61010-1, and CAN/CSA-C22.2 No. 61010-1.