GE DS3800HCMA1E1G

Technical Specifications

• Product Type: High-Current Multiplexer Analog Board (Revision 1E1G)

• Part Number: DS3800HCMA1E1G

• 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: 1 multiplexed differential analog output

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

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

• Input Current: Up to 60mA per channel (current mode) – highest in series

• Multiplexing Speed: 500 channels per second (2ms per channel) – fastest in series

• Scan Sequence: Sequential, skip, or programmable priority scan (jumper-selectable)

• Accuracy: ±0.1% of full scale at 25°C; ±0.008% per °C drift – best in series

• Protection: Enhanced over-voltage (±100V) and over-current protection per input – highest in series

• 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 (> 100kV/µs)

• Temperature Range: -40°C to +90°C – widest in series

• MTBF: > 250,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• Fastest Scanning Speed: The GE DS3800HCMA1E1G scans at 500 channels per second (2ms per channel), providing the fastest data acquisition in the HCMA series.

• Maximum Input Protection: Withstands ±100V, offering the highest resilience against wiring errors and transients.

• Highest Drive Capability: Handles up to 60mA per channel in current mode.

• Programmable Priority Scan: Allows critical channels to be scanned more frequently than non-critical channels.

• Best Accuracy: ±0.008% per °C drift ensures precision in fluctuating temperatures.

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

• Highest Transient Immunity: > 100kV/µs for superior noise rejection.

• Widest Temperature Range: -40°C to +90°C suits the most extreme environments.

Typical Application Cases

• High-Speed Temperature Monitoring: Multiplexes thermocouple and RTD signals with rapid scan rates.

• Pressure Transducer Scanning: Monitors multiple pressure transmitters with priority scanning for critical channels.

• Vibration Monitoring: Scans accelerometer signals for turbine health monitoring.

• Process Control: Multiplexes analog inputs for high-speed DCS integration.

• Extreme Environment Installations: Widest temperature range suits offshore, arctic, or desert sites.

Competitive Comparison

The GE DS3800HCMA1E1G is the definitive pinnacle of the HCMA series, offering the fastest scanning speed, highest protection, and broadest environmental tolerance.

Selection Guidelines & Precautions

1. Input Type Selection: Configure jumpers per channel for voltage or current to match your field sensors.

2. Scan Speed: The GE DS3800HCMA1E1G scans at 2ms per channel. Ensure this meets your application’s requirements.

3. Priority Scan: Configure priority scan for critical channels requiring more frequent sampling.

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

5. Input Protection: The GE DS3800HCMA1E1G withstands ±100V. Prolonged exposure may degrade accuracy.

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

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

8. ESD Handling: Use ESD-safe practices.

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

   • All 16 channels tested in voltage and current modes

   • Scan speed verification (500 ch/s)

   • Priority scan verification

   • Accuracy and drift test (±0.008%/°C)

   • Protection validation (±100V)

   • Diagnostic reporting validation

   • Isolation test (2500Vrms)

10. Spare Strategy: Keep one spare GE DS3800HCMA1E1G on-site for critical high-speed multiplexing applications. If unavailable, the DS3800HCMA1A1B is a compatible alternative with reduced specifications. Proactive replacement after 10 years of continuous operation is recommended.