DS3800HBPD GE

Technical Specifications

• Product Type: High-Speed Buffer/Pulse Driver Board

• Part Number: DS3800HBPD

• Manufacturer: General Electric (GE)

• System Compatibility: GE Speedtronic Mark IV Turbine Control Systems

• Input Channels: 8 high-speed digital inputs

• Output Channels: 8 high-speed digital outputs

• Input Type: Differential or single-ended (jumper-selectable)

• Output Type: 5Vdc, 12Vdc, or 24Vdc (jumper-selectable)

• Maximum Frequency: 500kHz (input and output)

• Propagation Delay: < 100ns

• Drive Capability: Up to 50mA per output channel

• Protection: Over-current and short-circuit protection per output

• Isolation: 1500Vrms opto-isolation (logic-to-field)

• Temperature Range: 0°C to +60°C

• MTBF: > 150,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• High-Speed Operation: The GE DS3800HBPD supports frequencies up to 500kHz, making it suitable for speed pickup and position encoder applications.

• Flexible Input Configuration: Jumper-selectable differential or single-ended inputs accommodate various sensor types.

• Selectable Output Levels: Outputs can be configured for 5V, 12V, or 24V to match field device requirements.

• Low Propagation Delay: < 100ns ensures minimal signal latency.

• Comprehensive Protection: Over-current and short-circuit protection prevents damage to the board and field devices.

• Diagnostic LEDs: Front-panel LEDs indicate input and output status per channel.

Typical Application Cases

• Speed Pickup Signal Conditioning: The GE DS3800HBPD conditions and amplifies signals from magnetic or optical speed pickups for turbine speed monitoring.

• Position Encoder Interfacing: Interfaces with incremental encoders for position feedback on actuators and valves.

• Pulse Counter Driving: Drives pulse counters and frequency meters in the control system.

• Digital Signal Distribution: Buffers and distributes high-speed digital signals to multiple destinations.

• Servo Valve Command: Amplifies pulse-width modulation (PWM) signals for servo valve control.

Competitive Comparison

The GE DS3800HBPD is the only Mark IV board dedicated to high-speed digital pulse conditioning and buffering.

Selection Guidelines & Precautions

1. Frequency Verification: Confirm your application’s maximum frequency does not exceed 500kHz.

2. Input Type: Select differential or single-ended input mode to match your sensor type.

3. Output Voltage: Configure output voltage (5V, 12V, or 24V) to match your field device requirements.

4. Cable Length: For high-speed signals (> 100kHz), keep cable lengths short (< 50m) to maintain signal integrity.

5. Wiring: Use shielded twisted-pair cables for both inputs and outputs. Ground shield at the GE DS3800HBPD end only.

6. Short-Circuit Protection: Protected, but repeated shorting may affect reliability.

7. Commissioning: Verify input and output signal levels with an oscilloscope during startup.

8. ESD Handling: Use ESD-safe practices.

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

   • All 8 input channels tested for threshold accuracy

   • All 8 output channels tested at 5V, 12V, and 24V

   • Frequency response test (up to 500kHz)

   • Propagation delay measurement (< 100ns)

   • Protection validation

10. Spare Strategy: Keep one spare GE DS3800HBPD on-site for critical speed monitoring or pulse counter applications. For higher frequency requirements (> 500kHz), consider external signal conditioning modules.