GE DS3800HCMC1A1B

Technical Specifications

• Product Type: High-Current Multiplexer Controller Board (Revision 1A1B)

• Part Number: DS3800HCMC1A1B

• Manufacturer: General Electric (GE)

• System Compatibility: GE Speedtronic Mark IV Turbine Control Systems (Rev. L and later)

• Control Channels: Up to 64 multiplexer channels (expandable)

• Scan Control: Sequential or skip (jumper-selectable)

• Scan Speed: Selectable 100, 200, or 500 channels per second – expanded

• Synchronization: External trigger input with adjustable trigger delay (0-100ms) – improved

• Output: Channel address and control signals to multiplexer boards

• Protection: Enhanced over-voltage and short-circuit protection on outputs

• Diagnostics: Fault detection with LED indication and backplane reporting

• Isolation: 2500Vrms reinforced isolation (upgraded from 1500Vrms)

• Temperature Range: -40°C to +70°C (extended)

• MTBF: > 180,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• Higher Scan Speed: The GE DS3800HCMC1A1B supports up to 500 channels per second, providing faster data acquisition.

• Adjustable Trigger Delay: Allows precise synchronization with external events (0-100ms delay).

• Reinforced Isolation: 2500Vrms for superior noise immunity and safety.

• Extended Temperature Range: -40°C to +70°C suits harsh environments.

• Diagnostic Reporting: Backplane reporting enables remote monitoring.

• Centralized Control: Manages all multiplexer boards in the system.

Typical Application Cases

• Multi-Board Multiplexing: Coordinates scanning across multiple multiplexer boards.

• Synchronized Data Acquisition: Synchronizes analog scanning with external events with adjustable delay.

• High-Speed Scanning: Suitable for applications requiring 500 channels per second.

Competitive Comparison

The GE DS3800HCMC1A1B offers significant improvements over the “1A1A” revision in scan speed, synchronization, isolation, and temperature range.

Selection Guidelines & Precautions

1. Scan Speed Selection: Configure for 100, 200, or 500 ch/s to match your application’s requirements.

2. Skip Mode: Unused channels should be set to “skip” to optimize scan time.

3. Trigger Delay: Adjust delay (0-100ms) for precise synchronization with external events.

4. Diagnostic Reporting: Requires Mark IV firmware Rev. L or later for backplane reporting.

5. Wiring: Use shielded cables for trigger inputs; ground shield at board end only.

6. ESD Handling: Use ESD-safe practices.

7. Sourcing: Obsolete. Request functional test report including:

   • Scan speed verification (100/200/500 ch/s)

   • Trigger delay functionality test

   • Output control signal verification

   • Isolation test (2500Vrms)

8. Spare Strategy: Keep one spare GE DS3800HCMC1A1B on-site for critical multiplexer systems. If advanced features like priority scan are required, consider a later revision. Proactive replacement after 10 years of continuous operation is recommended.