DS3800HCMC1B1B GE

Technical Specifications

• Product Type: High-Current Multiplexer Controller Board (Revision 1B1B)

• Part Number: DS3800HCMC1B1B

• 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, skip, or priority scan (jumper-selectable) – new feature

• Scan Speed: Selectable 100, 200, 500, or 1000 channels per second – expanded

• Priority Channels: Up to 8 channels can be designated for priority scanning – new feature

• Synchronization: External trigger input with adjustable trigger delay (0-200ms) – 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

• Temperature Range: -40°C to +75°C (extended)

• MTBF: > 200,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• Priority Scan Capability: The GE DS3800HCMC1B1B allows up to 8 channels to be designated as priority, scanning them more frequently than non-priority channels – a critical feature for critical turbine parameters.

• Higher Scan Speed: Supports up to 1000 channels per second for ultra-fast data acquisition.

• Adjustable Trigger Delay: 0-200ms delay for precise synchronization with external events.

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

• Extended Temperature Range: -40°C to +75°C suits harsh environments.

• Diagnostic Reporting: Backplane reporting enables remote monitoring.

Typical Application Cases

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

• Priority Scanning: Scans critical channels (e.g., overspeed, exhaust temperature) more frequently.

• High-Speed Data Acquisition: Suitable for applications requiring up to 1000 channels per second.

• Synchronized Data Acquisition: Synchronizes with external events for time-critical measurements.

Competitive Comparison

The GE DS3800HCMC1B1B offers significant improvements over earlier revisions with priority scan, higher speed, and extended trigger delay.

Selection Guidelines & Precautions

1. Scan Speed Selection: Configure for 100, 200, 500, or 1000 ch/s to match your application’s requirements.

2. Priority Channels: Designate up to 8 critical channels for priority scanning. Priority channels are scanned at 2x or 4x the base rate.

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

4. Trigger Delay: Adjust delay (0-200ms) for precise synchronization with external events.

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

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

7. ESD Handling: Use ESD-safe practices.

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

   • Scan speed verification (100-1000 ch/s)

   • Priority scan functionality verification

   • Trigger delay functionality test

   • Output control signal verification

   • Isolation test (2500Vrms)

9. Spare Strategy: Keep one spare GE DS3800HCMC1B1B on-site for critical multiplexer systems. This revision is preferred for applications requiring priority scanning. If unavailable, the DS3800HCMC1A1B is a compatible alternative with reduced speed and no priority scan. Proactive replacement after 10 years of continuous operation is recommended.