DS3800HCMB1C1C GE

Technical Specifications

• Product Type: High-Current Multiplexer Buffer Board (Revision 1C1C)

• Part Number: DS3800HCMB1C1C

• Manufacturer: General Electric (GE)

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

• 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: < 5Ω (voltage mode); > 1MΩ (current mode)

• Buffer Gain: Selectable 0.5x, 1x, 2x, or 4x via jumpers

• Bandwidth: DC to 100kHz

• Protection: Enhanced over-voltage (±75V) and over-current protection per channel – improved

• Diagnostics: Individual channel fault detection (over-voltage, over-current, open-circuit, signal out-of-range) with LED indication and backplane reporting

• Isolation: 2500Vrms reinforced isolation with enhanced common-mode transient immunity (> 75kV/µs) – improved

• Temperature Range: -40°C to +80°C – extended

• MTBF: > 220,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• Signal Integrity Preservation: The GE DS3800HCMB1C1C provides high-input-impedance buffering, preventing signal degradation.

• Expanded Gain Options: Selectable gain (0.5x, 1x, 2x, 4x) for flexible signal scaling.

• Wider Bandwidth: DC to 100kHz for faster signal response.

• Lower Output Impedance: < 5Ω drives longer cable runs (> 800m).

• Enhanced Protection: Over-voltage protection (±75V) safeguards against wiring errors.

• Advanced Diagnostics: Individual channel fault detection with LED and backplane reporting for predictive maintenance.

• Reinforced Isolation: 2500Vrms with transient immunity (> 75kV/µs) for superior noise rejection.

• Extended Temperature Range: -40°C to +80°C suits harsh environments.

• 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 cable runs > 800m.

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

• Harsh Environment Installations: Extended temperature range suits offshore, arctic, or desert sites.

Competitive Comparison

The GE DS3800HCMB1C1C offers significant improvements over the 1C1B in protection, diagnostics, isolation, and temperature range.

Selection Guidelines & Precautions

1. Gain Selection: Configure gain to match the input range of your monitoring device (0.5x, 1x, 2x, or 4x).

2. Cable Length: Supports cables up to 800m. For longer runs, use additional line drivers.

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

4. Bandwidth Consideration: Supports DC to 100kHz. For higher frequencies, consider external buffer amplifiers.

5. Diagnostic Reporting: Requires Mark IV firmware Rev. M or later for full diagnostic support.

6. ESD Handling: Use ESD-safe practices.

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

   • All 16 channels tested in voltage and current modes

   • Gain verification at all settings (0.5x, 1x, 2x, 4x)

   • Bandwidth test (DC to 100kHz)

   • Output impedance measurement (< 5Ω)

   • Protection validation (±75V)

   • Diagnostic reporting validation

   • Isolation test (2500Vrms)

8. Spare Strategy: Keep one spare GE DS3800HCMB1C1C on-site for critical signal distribution applications. This revision is preferred over 1C1B for harsh or high-noise environments. If unavailable, the DS3800HCMB1C1B is a compatible alternative with reduced specifications. Proactive replacement after 10 years of continuous operation is recommended.