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GE DS3800NADB

  • Product Name:​ GE 12-Bit Analog-to-Digital Converter Printed Circuit Board (Auxiliary Interface Panel)
  • Introduction:​ The DS3800NADB is a 12-bit A/D converter printed circuit board within GE Speedtronic Mark IV family of gas and steam turbine control systems, functioning as a motherboard to the smaller auxiliary board DS3800DADB.
  • Technical Specifications:
    • Manufacturer: General Electric
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Detailed content

    • Series: Mark IV Speedtronic
    • Function: 12-bit Analog-to-Digital Conversion Card
    • Resolution: 12 bits (4096 distinct levels)
    • A/D Converter IC: ADC85H-12 12-bit A/D converter with reference and clock
    • Analog Input Signal Ranges: ±2.5 V, ±5 V, ±10 V, 0 to +5 V, or 0 to +10 V (via scaling resistors)
    • Digital Output: DTL and TTL compatible; negative-true; available in serial or parallel form
    • Indicators: 1 amber LED marked “P OK” for power status
    • Test Points: 3 TP test points marked COM/SYNC/AOUT
    • Variable Resistors: 2 potentiometers
    • Connectors: 1 male connector, 1 female connector, 1 ribbon connector (for DS3800DADB communication)
    • Jumper Switches: J1 (range), J2 (parity, in/out), J3 (osc, in/out)
    • Extractor Tabs: Attached to upper and lower right corners
    • Alignment Mark: “NADB 6 DA 02 6 BA 04” on bottom edge
  • Features:​ High resolution 12-bit conversion for accurate measurement and control; output signal compatibility with DTL/TTL; redundancy design with two-out-of-three voting on the Mark IV system; spare PTH along right edge for additional circuit modifications; factory drilled and marked for alignment.
  • Material & Structure:​ Relatively large PCB functioning as motherboard; populated with multiple integrated circuits including ADC85H-12; capacitors for filtering and energy storage; when DS3800DADB is mounted, eight capacitors (708A1 200V M/E) greatly increase capacitance.
  • Working Principle:​ The ADC85H-12 A/D converter with reference and clock performs analog-to-digital conversion, with scaling resistors providing configurable analog input signal ranges; digital output is DTL/TTL compatible, negative-true, available in serial or parallel form for interfacing with other digital devices.
  • Application Scenarios:​ Mark IV Speedtronic gas and steam turbine control systems; industrial environments with temperature and humidity variations; EMI/RFI-heavy industrial settings with built-in shielding and filtering.
  • Installation Requirements:​ Install as motherboard in Mark IV rack with DS3800DADB auxiliary board connected via ribbon connector; configure jumper switches (J1 range, J2 parity, J3 osc) according to system requirements; align using factory marks on bottom edge.
  • Usage Notes:​ Set jumper switches correctly for range, parity, and oscillator settings; monitor “P OK” LED for power status; use test points (COM/SYNC/AOUT) for testing and debugging; handle with ESD protection.

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