Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Input Voltage | 125 VDC nominal (range 100–150 VDC); 24 VDC compatible with external adapter |
| Input Redundancy | Dual independent inputs with automatic failover (diode‑ORed) |
| Output Rails | +5 VDC / 6A (precision logic), ±15 VDC / 1.5A (each rail, precision analog) |
| Isolation | Full isolation (1.5kV input‑to‑output, 2.0kV output‑to‑ground) |
| Protection | Overcurrent protection (fixed), short‑circuit protection, transient suppression (4kV), reverse polarity protection, input undervoltage lockout |
| Regulation | Load regulation: ±0.05%; Line regulation: ±0.02%; Temperature coefficient: < 50 ppm/°C |
| Ripple | < 5mVpp (+5V), < 3mVpp (±15V) |
| Temperature Compensation | Active temperature compensation using precision reference ICs and thermistor‑based feedback networks |
| Monitoring | 3 analog feedback channels (voltage monitoring for +5V and ±15V); 2 digital fault outputs (relay, 24V/0.5A) for output faults and input failover |
| Digital Interface | 1 digital input for remote enable/disable |
| Operating Temperature | –25°C to +60°C |
| Form Factor | 6U × 6HP (30mm) – requires 1.5 slots |
| Backplane Connector | Standard VME 96‑pin P1 + reinforced 60‑pin P2 (for second input) |
| Status LEDs | 6 indicators: INPUT 1 OK (green), INPUT 2 OK (green), OUTPUT OK (green), FAULT (red), TEMP COMP ACTIVE (blue), FAILOVER ACTIVE (amber) |
| Certifications | CE, UL 508 (non‑hazardous locations only) |
| Efficiency | ~78% at full load |
Critical note: The DS3800NRTA is a redundant temperature‑compensated power board designed for precision instrumentation applications requiring both power continuity and temperature stability. It is physically wider (6HP) than standard 4HP boards and requires 1.5 adjacent slots. Hot‑swapping is not supported.
Key Features & Advantages
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Redundant Input + Temperature Compensation – The DS3800NRTA uniquely combines dual input failover with active temperature compensation, ensuring both power continuity and voltage stability across temperature variations.
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Precision Temperature Compensation – Active compensation using precision voltage references and thermistor‑based feedback maintains a temperature coefficient of < 50 ppm/°C—critical for precision analog measurements.
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Exceptional Regulation – Load regulation of ±0.05% and line regulation of ±0.02% ensure stable outputs for sensitive circuits.
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Dual Input Redundancy – Accepts two independent DC inputs with automatic failover, ensuring uninterrupted power to critical instrumentation.
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Two Fault Relays – Separate fault indication for output faults and input failover events.
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Full Isolation – 1.5kV isolation protects sensitive circuits from ground loops and transients on either input source.
Typical Application Cases
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Critical Instrumentation Cabinets – Powers precision instruments where both power continuity and temperature stability are essential.
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Calibration Laboratories – Supplies power to calibration equipment requiring stable, low‑drift power with redundancy.
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High‑Precision Measurement Systems – Powers vibration analysis, temperature monitoring, and other critical measurement systems.
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Offshore Platforms with Dual Battery Banks – Dual input capability supports connection to two independent battery banks.
Competitive Comparison
| Aspect | DS3800NRTA (GE) | DS3800NPTA1E1B (GE) | DS3800NPSR1B1B (GE) |
|---|---|---|---|
| Input Redundancy | Yes | No | Yes |
| Temperature Coefficient | < 50 ppm/°C | < 30 ppm/°C | ~200 ppm/°C |
| +5V Output | 6A | 8A | 15A |
| Form Factor | 6HP (1.5 slots) | 4HP (1 slot) | 6HP (1.5 slots) |
| Price (refurb) | ~$4,200–$6,000 | ~$3,800–$5,200 | ~$4,500–$6,500 |
Selection Guidelines & Precautions
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Application Verification – Designed for precision instrumentation requiring both redundancy and temperature stability. If only one feature is needed, dedicated boards may be more cost‑effective.
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Physical Compatibility – 6HP wide, requires 1.5 adjacent slots. Will not fit in 4HP slots.
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Backplane Compatibility – Uses P1 and reinforced P2. If backplane lacks P2, redundancy unavailable.
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Temperature Compensation – Requires 30‑minute warm‑up to achieve specified temperature coefficient.
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Thermal Derating – Full output to 50°C; derate to 90% at 50–55°C, 80% at 55–60°C. Do not operate above 60°C.
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Spare Sourcing – Production ended in 2015. Request test report verifying outputs, failover, and temperature stability. Inspect for capacitor bulging or discoloration.
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