GE DS3800NPTB

Technical Parameters

Critical note: The DS3800NPTB is a temperature‑compensated power board designed for precision analog applications requiring exceptional voltage stability across temperature variations. It offers the highest current capacity and lowest temperature drift in the NPT family. Hot‑swapping is not supported.

Key Features & Advantages

• Advanced Temperature Compensation – The DS3800NPTB incorporates active dual‑zone temperature compensation with a heatsink‑mounted sensor for improved thermal tracking, maintaining output voltage stability with a temperature coefficient of < 25 ppm/°C—the best in the DS3800 family.

• Exceptional Regulation – Load regulation of ±0.03% and line regulation of ±0.01% ensure the most stable output voltages in the DS3800 family.

• Highest Capacity in NPT Family – The DS3800NPTB offers the highest current ratings in the NPT family: +5V at 10A (25% more than NPTA1E1B) and ±15V at 3A (50% more), making it suitable for demanding precision applications.

• Ultra‑Low Output Ripple – With < 3mVpp on the +5V rail and < 2mVpp on ±15V rails, the DS3800NPTB delivers clean power for high‑precision analog circuits.

• Quad Monitoring Channels – Four analog feedback channels provide voltage and current telemetry for +5V and ±15V outputs, enabling comprehensive remote monitoring.

• Adjustable Overcurrent Protection – Each output has individual overcurrent protection with adjustable thresholds via onboard jumpers.

• Relay Fault Output – A form‑C relay contact (24V/1A) provides fault indication for integration with plant DCS.

• Thermal Warning Output – A digital output provides early warning of overtemperature conditions before fault shutdown, enabling proactive cooling management.

• Extended Temperature Range – –30°C to +70°C range and CSA Div 2 certification make the DS3800NPTB suitable for demanding environments.

• Enhanced Thermal Design – The heatsink‑mounted temperature sensor provides more accurate thermal tracking, improving compensation accuracy during rapid temperature changes.

Typical Application Cases

• High‑Precision Analog Signal Conditioning – Provides ultra‑stable, low‑drift power to analog isolators, transducers, and signal converters.

• Reference Voltage Sources – Powers precision voltage reference circuits and calibration equipment requiring stable, low‑drift power.

• Calibration Laboratories – Supplies power to calibration equipment where temperature stability is critical.

• Critical Measurement Systems – Powers high‑precision measurement systems (e.g., vibration analysis, temperature monitoring) where power supply drift would introduce measurement errors.

• Demanding Instrumentation Applications – Provides precision power for instrumentation racks with higher current demands.

Competitive Comparison

The DS3800NPTB is the flagship precision power board in the DS3800 family, offering the lowest temperature drift, highest capacity, and comprehensive monitoring for demanding precision analog applications.

Selection Guidelines & Precautions

1. Application Verification – The DS3800NPTB is designed for precision analog applications where ultra‑low temperature drift is critical. If your application does not require this level of stability, NPSZ or NPSE boards may be more cost‑effective.

2. Power Budget – Calculate total current draw:

   • +5V: max 10A

   • ±15V: max 3A each
     Exceeding any output will trigger overcurrent protection and latch that output off.

3. Protection Threshold Adjustment – Configure overcurrent thresholds via onboard jumpers (JP1–JP4) based on load requirements. Factory defaults are 120% of rated current.

4. Temperature Compensation Warm‑Up – The active dual‑zone temperature compensation requires a warm‑up period of approximately 30 minutes to achieve specified temperature coefficient (< 25 ppm/°C). Allow sufficient warm‑up time before critical measurements.

5. Heatsink‑Mounted Sensor – The heatsink‑mounted temperature sensor provides improved thermal tracking. Ensure the heatsink is clean and properly seated to maintain accurate compensation.

6. Environmental Considerations – Install the DS3800NPTB away from heat sources and ensure adequate airflow. The compensation accuracy relies on accurate thermal tracking—blocked airflow may affect performance.

7. Grounding for Full Isolation – Use separate returns:

   • IN_GND → Battery negative

   • OUT_GND → Rack logic ground
     Using a common ground defeats the isolation barrier.

8. Thermal Derating – Full output available up to 60°C:

   • 60°C–65°C: derate all outputs to 90% of rated current

   • 65°C–70°C: derate all outputs to 80% of rated current

   • Above 70°C: do not operate

9. Spare Sourcing – Production ended in 2020. When purchasing refurbished units, request a load test report verifying output voltage stability across temperature (25°C, 45°C, and 65°C) at full load. Verify temperature coefficient (< 25 ppm/°C) if possible. Verify analog feedback accuracy, relay functionality, and thermal warning output. Visually inspect for capacitor bulging, discoloration, or burned traces. The DS3800NPTB is the ultimate precision power solution—prioritize this for the most demanding instrumentation applications requiring the highest temperature stability and current capacity.