The DS3800NTBG is a PCB made by GE for the Mark IV system. The series was created for gas/steam turbine control and built with integrated platforms run by microprocessors.
The DS3800NTBG is not specified to be a thermocouple card but is built with two large thermocouple components taking up the majority of its surface. The MKIV system is designed to run with many thermocouple cards that all report their calculated values. The integrated microprocessors use these assessments to decide how to do things such as how to limit fuel for the turbine. Thus it is important each of these cards remains in excellent working order, as deviations from a single card can cause a resulting bias in the final assessment, which may lead to a statistical loss of input or potentially serious engine problems.
The DS3800NTBG is drilled twice at each corner. Screws have been inserted once in each corner through vertical spacers located under the printed circuit board. These attach to a DIN mounting plate. The board itself is printed with a waffle pattern; all components and screw mounts avoid drilling through this pattern.
The DS3800NTBG has two thermocouple components located on its surface. It has three vertical pin mating connectors positioned on the top middle edge of the board. There are three lines of capacitors down the center of the board.
The DIN mounting plate below the DS3800NTBG has two downward-facing flanges. Several screw mounts have been drilled along the edges of the plate. The plate has one upward facing flange, which also has several screw holes drilled through it. This flange has a line of quick-connect screw mounts placed along its top edge.