Digital guide
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GE DS3800NADA
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Product Description: Analog input interface for Mark IV gas/steam turbine control. Converts field 4–20 mA and 0–10 V signals (temperature, pressure, valve feedback, speed pickups) into digital words for the controller.
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Technical Specifications:
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ADC type: Successive-approximation, 12-bit class
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Detailed content
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Channels: 8–16 analog inputs depending on firmware
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Inputs: 4–20 mA (250 Ω shunt) or 0–10 V DC
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Accuracy: ±0.5 % FS typical
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Scan sync: 40–80 ms Mark IV task rate
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Backplane power: +5 V logic, ±15 V analog
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Operating temp: -30 °C to +65 °C
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Mechanical: 3 anodized aluminum stiffener bars, through-hole components, 1 amber LED, 3 test points, 2 calibration pots
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Functional Features: Onboard sample-hold, binary counters, buffers, D-flip-flops, edge connectors for Mark IV backplane.
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Application Scenarios: Mark IV turbine control cabinets, vintage GE Frame 5/6/7 retrofits still in service.
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Installation Requirements: Seat in analog I/O slot, calibrate zero/span pots with certified source, verify backplane voltages before insertion.
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Usage Notes: Potentiometer drift occurs over decades; recalibrate during outage. Do not clean conformal surface with abrasive solvent.
