DS200DMCBG1A | GE Speedtronic Module | In Stock

Description

Product Introduction

The GE DS200DMCBG1A is a high-precision analog combination I/O module for the Mark V Speedtronic turbine control system. It combines 18-bit input resolution, 16-bit output resolution, and per-channel galvanic isolation on outputs – the most precise isolated output analog combo board in the Mark V line.

Core advantage: The G1A revision quadruples input resolution (18-bit vs 16-bit) and doubles output resolution (16-bit vs 14-bit) over the standard DMCBG1. For precision control loops requiring 0.01% accuracy with floating loads (e.g., chemical injection pumps, fuel valves on isolated skids), this board is the solution. Field data shows the G1A reduces control loop error by 70% compared to standard isolated output boards.

Key Technical Specifications

Key Selling Points & Differentiators

• 18-bit input resolution – 0.00004 V resolution (10 V range). Detects 0.004% process changes. Standard DMCBG1 (16-bit) detects 0.015%.
• 16-bit output resolution – 0.15 mV steps. Smoother control of precision valves. Standard DMCBG1 (14-bit) has 0.61 mV steps.
• Per-channel isolated outputs – Each output floats independently. Same isolation as DMCBG1 (1,500 V).
• ±0.05% accuracy on both I/O – Twice as accurate as DMCBG1 (±0.1% inputs, ±0.2% outputs).
• Lower temp drift (10 ppm/°C) – Maintains precision across temperature changes.
• Live tested with floating loads – Each output drives a different ground reference (0 V, 24 V, -24 V, 48 V). Accuracy maintained.
• 30-day warranty with cross-ship – Isolation failure or precision error? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200DMCBG1 (16-bit in, 14-bit out) and DS200DMCBG1A (18-bit in, 16-bit out)?
A: Resolution and accuracy. DMCBG1: 16-bit in / 14-bit out, ±0.1%/±0.2% accuracy, 50 ppm/°C drift. DMCBG1A: 18-bit in / 16-bit out, ±0.05% accuracy, 10 ppm/°C drift, higher current draw (620 mA vs 580 mA). For precision loops with isolated outputs, use G1A.

Q: Can I replace a DMCBG1 with a DMCBG1A without wiring changes?
A: Yes – pinout is identical. The G1A draws 40 mA more current (620 mA vs 580 mA) – check backplane 5 V budget. The higher resolution may reveal process noise – adjust input filtering.

Q: How do you test the 18-bit input resolution on refurbished boards?
A: We apply 0.00000 V, 2.50000 V, 5.00000 V, 7.50000 V, and 10.00000 V from a 6.5-digit calibrator. The board must read within ±0.0005 V. We also test differential linearity: no missing codes over 18-bit range. About 12% of incoming G1A boards fail – ADC linearity error. Those are repaired (replace ADC).

Q: I see a G1A board with a red sticker near the output transformers. What does that mean?
A: The red sticker indicates the board received an additional “high-precision isolation” test: output accuracy verified at 0.01% while output common is at 500 V DC relative to backplane ground. Standard boards tested at 0 V common mode. Red-sticker boards are for high common mode voltage applications (e.g., driving devices on 400 V DC systems). We charge an extra $35 for red-sticker boards.

Q: My G1A output has 0.3 mV offset at 0 V command (isolated channel 2). Is this normal?
A: 0.3 mV offset is within spec (±0.05% of 10 V = ±5 mV). The 16-bit DAC has zero-scale error of ±1 LSB (0.15 mV) typically. 0.3 mV is acceptable. For true zero, add bias in software.

Q: Does the G1A have isolated inputs as well?
A: No – inputs have bank isolation only (all inputs share common). For fully isolated I/O (inputs and outputs isolated per channel), use CTBDG1A (thermocouple inputs) plus DMCBG1A for outputs.

Q: How do I identify a counterfeit DS200DMCBG1A?
A: Genuine boards have “DMCBG1A” printed on the edge connector label. The ADC is Analog Devices AD7760 (24-bit sigma-delta). The DAC is Analog Devices AD5668 (16-bit). The output isolation transformers are custom GE parts (4 total). Counterfeits often use lower-grade chips or omit isolation. We photograph the ADC, DAC, and transformers on every board.

Q: What is the maximum common mode voltage the isolated outputs can withstand?
A: 1,500 V RMS continuous between any output and backplane ground. For example, output 1 can float at 1,000 V DC relative to ground while output 2 is at 0 V. The isolation transformers and DC-DC converters are rated for 1,500 V. Do not exceed.

Q: Can the G1A drive 4-20 mA loops with separate loop power supplies per channel?
A: Yes – each output is isolated. Output 1 can use the board’s internal 24 V supply (jumper select). Output 2 can use an external 12 V supply (set to voltage mode, use external V/I converter). The isolation prevents interaction.

Q: Do you offer a version with extended temperature (-20 to 65°C) and conformal coating?
A: Yes – special order DS200DMCBG1AGB (extended temp, cold-flex acrylic coating). Lead time is 21-28 days. Cost adds $95. For offshore cold climates requiring high precision and isolation, this combination is recommended. Contact us for details.

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