GE DS3800HCMA1F1G

Technical Specifications

• Product Type: High-Current Multiplexer Analog Board (Revision 1F1G)

• Part Number: DS3800HCMA1F1G

• 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 65mA per channel (current mode) – highest in series

• Multiplexing Speed: 600 channels per second (1.67ms per channel) – fastest in series

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

• Accuracy: ±0.1% of full scale at 25°C; ±0.007% per °C drift – best in series

• Protection: Enhanced over-voltage (±120V) and over-current protection per input – highest in series

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

• Isolation: 2500Vrms reinforced isolation with enhanced common-mode transient immunity (> 120kV/µs) – highest in series

• Temperature Range: -40°C to +95°C – widest in series

• MTBF: > 280,000 hours (MIL-HDBK-217F)

Key Features & Advantages

• Fastest Scanning Speed: The GE DS3800HCMA1F1G scans at 600 channels per second (1.67ms per channel), providing the fastest data acquisition in the HCMA series.

• Maximum Input Protection: Withstands ±120V, offering the highest resilience against wiring errors and transients.

• Highest Drive Capability: Handles up to 65mA per channel in current mode.

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

• Best Accuracy: ±0.007% per °C drift ensures precision in fluctuating temperatures.

• Advanced Diagnostics: Individual channel fault detection (including channel health) with LED and backplane reporting.

• Highest Transient Immunity: > 120kV/µs for superior noise rejection.

• Widest Temperature Range: -40°C to +95°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.

• 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 DS3800HCMA1F1G is the definitive pinnacle of the HCMA series, offering the fastest scanning speed, highest protection, best accuracy, 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: Scans at 1.67ms per channel. Ensure this meets your application’s timing 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: Withstands ±120V. Prolonged exposure may degrade accuracy.

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

7. Channel Health Monitoring: Familiarize yourself with fault codes for channel health diagnostics.

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

9. ESD Handling: Use ESD-safe practices.

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

    • All 16 channels tested in voltage and current modes

    • Scan speed verification (600 ch/s)

    • Priority scan verification

    • Accuracy and drift test (±0.007%/°C)

    • Protection validation (±120V)

    • Diagnostic reporting validation (including channel health)

    • Transient immunity test (> 120kV/µs)

    • Isolation test (2500Vrms)

11. Spare Strategy: Keep one spare GE DS3800HCMA1F1G on-site for critical high-speed multiplexing applications. If unavailable, the DS3800HCMA1E1G is a compatible alternative with slightly reduced specifications. Proactive replacement after 10 years of continuous operation is recommended.