GE DS3800HCMB

Technical Specifications

• Product Type: High-Current Multiplexer Buffer Board

• Part Number: DS3800HCMB

• Manufacturer: General Electric (GE)

• System Compatibility: GE Speedtronic Mark IV Turbine Control Systems

• Input Channels: 16 differential analog inputs

• Output Channels: 16 buffered differential analog outputs

• Input Type: Voltage (±10V) or current (4-20mA) (jumper-selectable per channel)

• Input Impedance: > 10MΩ (voltage mode); 250Ω (current mode)

• Output Impedance: < 10Ω (voltage mode); > 1MΩ (current mode)

• Buffer Gain: Unity gain (1:1) or selectable gain (0.5x, 1x, 2x) via jumpers

• Bandwidth: DC to 50kHz

• Protection: Over-voltage and over-current protection per channel

• Isolation: 1500Vrms opto-isolation (input-to-output)

• Temperature Range: 0°C to +60°C

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

Key Features & Advantages

• Signal Integrity Preservation: The GE DS3800HCMB provides high-input-impedance buffering, preventing signal degradation when connecting multiple monitoring devices.

• Multiple Output Distribution: Buffers and distributes analog signals to multiple destinations.

• Selectable Gain: Jumper-selectable gain (0.5x, 1x, 2x) for signal scaling.

• Low Output Impedance: Drives long cable runs (> 500m) without signal attenuation.

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

Typical Application Cases

• Multiplexed Signal Distribution: Buffers multiplexed analog signals for distribution to multiple ADCs or monitoring devices.

• Long-Distance Transmission: Drives analog signals over long cable runs.

• Impedance Matching: Provides proper impedance matching for analog signal distribution.

Competitive Comparison

The GE DS3800HCMB is the only Mark IV board for buffering high-current multiplexed analog signals.

Selection Guidelines & Precautions

1. Gain Selection: Configure gain to match the input range of your monitoring device.

2. Cable Length: Supports cables up to 500m. For longer runs, use additional line drivers.

3. Wiring: Use shielded twisted-pair cables; ground shield at board end only.

4. ESD Handling: Use ESD-safe practices.

5. Sourcing: Obsolete. Request functional test report including all channels tested.

6. Spare Strategy: Keep one spare GE DS3800HCMB on-site for critical signal distribution.