GE DS3800DVRC1A1

Technical Specifications

• Product Type: Digital Voltage Reference & Calibration Board (Revision 1A1)

• Part Number: GE DS3800DVRC1A1

• Manufacturer: General Electric (GE)

• System Compatibility: GE Speedtronic Mark IV Turbine Control Systems

• Reference Outputs: 4 precision voltage references (±1V, ±5V, ±10V, and 0-10V)

• Accuracy: ±0.01% of full scale at 25°C; ±0.003% per °C drift (improved)

• Temperature Stability: < 3ppm/°C (improved from 5ppm/°C)

• Long-Term Stability: < 30ppm/year (improved from 50ppm/year)

• Load Regulation: < 0.005% for 0 to 10mA load

• Line Regulation: < 0.001% for ±10% input variation

• Protection: Short-circuit protected outputs

• Isolation: 1500Vrms isolation from backplane

• Temperature Range: 0°C to +65°C (extended)

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

Key Features & Advantages

• Enhanced Temperature Stability: The GE DS3800DVRC1A1 offers improved < 3ppm/°C drift, ensuring calibration accuracy over wider temperature variations.

• Better Long-Term Stability: < 30ppm/year reduces recalibration frequency and maintains system accuracy over extended periods.

• High-Precision References: Provides ±0.01% accuracy, essential for calibrating the Mark IV’s 12-bit analog-to-digital converters.

• Four Common Reference Values: Offers ±1V, ±5V, ±10V, and 0-10V, covering the full input range of most Mark IV analog boards.

• Extended Temperature Range: 0°C to +65°C provides greater margin in warm turbine enclosures.

• Short-Circuit Protection: Protected outputs prevent damage during calibration setup.

• Diagnostic LEDs: Front-panel LEDs indicate reference output status and fault conditions.

• External Test Points: Provides test points for external voltmeter verification during routine maintenance.

Typical Application Cases

• Analog Input Calibration: Calibrates DS3800DVIA and DS3800DVIA1A1B voltage input boards for accurate field signal readings.

• Analog Output Verification: Verifies accuracy of output boards by comparing against reference.

• System Diagnostics: Provides known-good signal source for troubleshooting faulty boards.

• Preventive Maintenance: Used during annual maintenance to check all analog board calibrations.

• Commissioning: Essential during initial startup to verify all analog channels meet specifications.

Competitive Comparison

The GE DS3800DVRC1A1 offers improved temperature and long-term stability over the DS3800DVRC1A, making it the preferred revision for high-ambient-temperature installations.

Selection Guidelines & Precautions

1. Reference Verification: Verify outputs with a calibrated external voltmeter before use. If drift is observed, the board requires factory recalibration.

2. Load Conditions: Accurate only when load current is below 10mA. For higher loads, use external buffer amplifier.

3. Warm-Up Time: Allow the GE DS3800DVRC1A1 to stabilize for at least 30 minutes after power-up before performing critical calibrations.

4. Short-Circuit: While protected, prolonged shorting may degrade accuracy over time.

5. Calibration Interval: GE recommended recalibration every 2 years. Send to qualified calibration lab if internal capability is unavailable.

6. ESD Handling: Use ESD-safe practices; contains precision reference components.

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

   • All 4 reference outputs verified for accuracy (±0.01%)

   • Temperature drift test (< 3ppm/°C)

   • Load regulation test (< 0.005%)

   • Isolation verification

   • Long-term stability test (if available)

8. Spare Strategy: Keep one spare GE DS3800DVRC1A1 on-site if regular analog board calibrations are performed. For critical sites, consider NIST-traceable external calibrator as backup.

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