Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Input Voltage | 125 VDC nominal (range 90–160 VDC); 24 VDC compatible with external adapter |
| Input Redundancy | Dual independent inputs with automatic failover and jumper‑configurable priority |
| Output Rails | +5 VDC / 8A (precision logic), ±15 VDC / 2A (each rail, precision analog) |
| Isolation | Full isolation (1.5kV input‑to‑output, 2.0kV output‑to‑ground) |
| Protection | Overcurrent protection (adjustable per output via jumpers), short‑circuit protection, transient suppression (6kV surge), reverse polarity protection, input undervoltage lockout |
| Regulation | Load regulation: ±0.03%; Line regulation: ±0.01%; Temperature coefficient: < 30 ppm/°C |
| Ripple | < 3mVpp (+5V), < 2mVpp (±15V) |
| Temperature Compensation | Active dual‑zone temperature compensation using precision reference ICs, thermistor‑based feedback, and heatsink‑mounted sensor for improved thermal tracking |
| Monitoring | 4 analog feedback channels (voltage and current 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; 1 digital output for temperature status indication |
| Operating Temperature | –30°C to +65°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 | 7 indicators: INPUT 1 OK (green), INPUT 2 OK (green), +5V OK (green), +15V OK (green), –15V OK (green), FAULT (red), TEMP COMP ACTIVE (blue) |
| Certifications | CE, UL 508, CSA Class I Div 2 |
| Efficiency | ~80% at full load |
Critical note: The DS3800NRTB is a redundant temperature‑compensated power board designed for precision instrumentation applications requiring both power continuity and temperature stability. It offers higher capacity and lower temperature drift than the NRTA series. This board 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 + Advanced Temperature Compensation – The DS3800NRTB uniquely combines dual input failover with active dual‑zone temperature compensation and a heatsink‑mounted sensor for improved thermal tracking.
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Ultra‑Low Temperature Drift – Maintains a temperature coefficient of < 30 ppm/°C—better than the NRTA series (< 50 ppm/°C).
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Higher Capacity than NRTA – The DS3800NRTB offers +5V at 8A (60% more) and ±15V at 2A (100% more) compared to the NRTA1A1A.
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Exceptional Regulation – Load regulation of ±0.03% and line regulation of ±0.01%—the best in the NRT family.
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Ultra‑Low Output Ripple – With < 3mVpp on the +5V rail and < 2mVpp on ±15V rails.
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Quad Monitoring Channels – Four analog feedback channels provide voltage and current telemetry for +5V and ±15V outputs.
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Adjustable Overcurrent Protection – Each output has individual overcurrent protection with adjustable thresholds via onboard jumpers.
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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.
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Wide Temperature Range – Extended –30°C to +65°C range and CSA Div 2 certification.
Typical Application Cases
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Critical Instrumentation Cabinets – Powers precision instruments requiring both power continuity and temperature stability with higher capacity demands.
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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 | DS3800NRTB (GE) | DS3800NRTA1A1A (GE) | DS3800NPTA1E1B (GE) |
|---|---|---|---|
| Input Redundancy | Yes (configurable priority) | Yes (fixed priority) | No |
| Temperature Coefficient | < 30 ppm/°C | < 50 ppm/°C | < 30 ppm/°C |
| +5V Output | 8A | 5A | 8A |
| ±15V Output | 2A each | 1A each | 2A each |
| Monitoring Channels | 4 (V + I) | 2 (V only) | 3 (V + I) |
| Form Factor | 6HP (1.5 slots) | 6HP (1.5 slots) | 4HP (1 slot) |
| Price (refurb) | ~$4,800–$6,800 | ~$3,500–$5,000 | ~$3,800–$5,200 |
The DS3800NRTB is the premier redundant temperature‑compensated power interface in the NRT family, offering higher capacity, lower temperature drift, and comprehensive monitoring.
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 (< 30 ppm/°C).
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Protection Thresholds – Adjust via onboard jumpers (JP1–JP3) based on load requirements.
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Thermal Derating – Full output to 55°C; derate to 90% at 55–60°C, 80% at 60–65°C. Do not operate above 65°C.
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Spare Sourcing – Production ended in 2018. Request test report verifying outputs, failover, and temperature stability at 25°C and 55°C. Inspect for capacitor bulging or discoloration.
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