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GE DS200TBCBG1AAA

Product Name:​ Mark V RTD / 4–20 mA Input Termination Board (TBCB)
Introduction:​ Field wiring termination and signal pre‑conditioning board for resistance thermometers and current transmitters in Mark V systems.
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Technical Specifications:
  • Input Channels:​ 16 (configurable subgroups)
  • Signal Types:​ 3‑wire/4‑wire RTD (100 Ω Pt), 4–20 mA, jumper selectable 0–1 mA
  • Excitation:​ Isolated 21 VDC sensor supply
  • Filtering:​ RC network per channel
  • Connections:​ Screw terminal strip + vertical backplane header
  • Temp:​ 0–60 °C
    Functional Features:
  • Lead‑wire compensation via 3‑wire scheme
  • Onboard jumpers for current vs RTD mode
  • Noise suppression for turbine deck
    Working Principle:​ Provides precision current source to RTD, measures voltage drop, passes conditioned signal to Mark V analog input board.
    Structure:​ Narrow PCB, edge terminal block, standoff spacers.
    Installation:​ Panel‑mount in TBQA rack, use twisted shielded pair for RTD, ground shield at one end only.
    Precautions:​ Mixing 2‑wire sensors on 3‑wire config introduces error; tighten terminals to avoid thermocouple‑like drift.

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