Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Input Voltage | 125 VDC nominal (range 85–165 VDC); 24 VDC compatible with external adapter |
| Input Redundancy | Dual independent inputs with automatic failover and jumper‑configurable priority |
| Output Rails | +5 VDC / 10A (precision logic), ±15 VDC / 3A (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: ±0.02%; Line regulation: ±0.01%; Temperature coefficient: < 20 ppm/°C (best in NRT family) |
| Ripple | < 3mVpp (+5V), < 2mVpp (±15V) |
| Temperature Compensation | Active dual‑zone temperature compensation with heatsink‑mounted sensor and precision reference ICs for improved thermal tracking |
| Monitoring | 4 analog feedback channels (voltage and current monitoring for +5V and ±15V); 2 digital fault outputs (relay, 24V/1A) 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 | ~82% at full load |
Critical note: The DS3800NRTC is the highest‑performance redundant temperature‑compensated power board in the NRT family, offering the lowest temperature drift (< 20 ppm/°C) and highest capacity (10A +5V, 3A ±15V). 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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Lowest Temperature Drift in NRT Family – Maintains a temperature coefficient of < 20 ppm/°C—the best in the NRT family and among the best in the entire DS3800 series.
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Highest Capacity in NRT Family – The DS3800NRTC offers +5V at 10A (25% more than NRTB) and ±15V at 3A (50% more), making it suitable for demanding instrumentation applications.
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Exceptional Regulation – Load regulation of ±0.02% 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, temperature stability, and high capacity.
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Calibration Laboratories – Supplies power to calibration equipment requiring the highest stability 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.
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Upgrade from Lower NRT Revisions – Offers the ultimate performance upgrade without changing rack configuration.
Competitive Comparison
| Aspect | DS3800NRTC (GE) | DS3800NRTB1A1A (GE) | DS3800NPTA1E1B (GE) |
|---|---|---|---|
| Input Redundancy | Yes (configurable priority) | Yes (fixed priority) | No |
| Temperature Coefficient | < 20 ppm/°C | < 50 ppm/°C | < 30 ppm/°C |
| +5V Output | 10A | 6A | 8A |
| ±15V Output | 3A each | 1.5A each | 2A each |
| Monitoring Channels | 4 (V + I) | 2 (V only) | 3 (V + I) |
| Price (refurb) | ~$5,500–$8,000 | ~$3,800–$5,500 | ~$3,800–$5,200 |
The DS3800NRTC is the flagship redundant temperature‑compensated power interface in the NRT family, offering the highest capacity, lowest temperature drift, and comprehensive monitoring.
Selection Guidelines & Precautions
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Application Verification – Designed for precision instrumentation requiring both redundancy, temperature stability, and high capacity. If only one or two features are needed, lower‑cost options may suffice.
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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 (< 20 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 2020. Request test report verifying outputs, failover, and temperature stability at 25°C and 55°C. Inspect for capacitor bulging or discoloration. Prioritize this for the most demanding precision instrumentation applications.
A-B 1756-SRC1
A-B 1756-BA2
A-B 1747-L541
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