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, fixed priority) |
| 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 | 2 analog feedback channels (voltage monitoring for +5V and +15V); 1 digital fault output (open‑collector) for output faults |
| 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 | 5 indicators: INPUT 1 OK (green), INPUT 2 OK (green), OUTPUT OK (green), FAULT (red), TEMP COMP ACTIVE (blue) |
| Certifications | CE, UL 508 (non‑hazardous locations only) |
| Efficiency | ~78% at full load |
Critical note: The DS3800NRTB1A1A is the baseline redundant temperature‑compensated power board in the NRTB family. 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 – Combines dual input failover with active temperature compensation for precision applications.
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Precision Temperature Compensation – Maintains temperature coefficient of < 50 ppm/°C.
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Exceptional Regulation – Load regulation of ±0.05% and line regulation of ±0.02%.
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Dual Input Redundancy – Automatic failover ensures uninterrupted power to critical instrumentation.
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Full Isolation – 1.5kV isolation protects sensitive circuits from ground loops and transients.
Typical Application Cases
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Critical Instrumentation Cabinets – Powers precision instruments requiring both power continuity and temperature stability.
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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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Legacy Fleet Replacement – Baseline replacement for failed NRTB units in older Mark IV systems.
Competitive Comparison
| Aspect | DS3800NRTB1A1A (GE) | DS3800NRTB (later revision) | DS3800NPTA1E1B (GE) |
|---|---|---|---|
| Input Redundancy | Yes (fixed priority) | Yes (configurable) | No |
| Temperature Coefficient | < 50 ppm/°C | < 30 ppm/°C | < 30 ppm/°C |
| +5V Output | 6A | 8A | 8A |
| ±15V Output | 1.5A each | 2A each | 2A each |
| Form Factor | 6HP (1.5 slots) | 6HP (1.5 slots) | 4HP (1 slot) |
| Price (refurb) | ~$3,800–$5,500 | ~$4,800–$6,800 | ~$3,800–$5,200 |
Selection Guidelines & Precautions
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Application Verification – Designed for precision instrumentation requiring both redundancy and temperature stability.
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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 2010. Request test report verifying outputs, failover, and temperature stability. Inspect for capacitor bulging or discoloration. Consider upgrading to later NRTB revisions for higher capacity and lower temperature drift.
A-B 1756-BA2
A-B 1756-BA2
A-B 1769-ECR
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