MIL-STD-1275F – Required Tests Summary

MIL-STD-1275F  – Required Tests Summary

**Note: E Version is Similar but requires a different Surge and Spike generator

1. Overview

MIL-STD-1275F  specifies how 28 VDC power for military ground vehicles must behave at the input terminals of utilization equipment. The tests below (referenced by paragraph) ensure equipment can tolerate normal operating conditions, engine-start disturbances, transients (spikes/surges), and reverse polarity without damage or performance degradation.

2. Test Requirements

2.1 Steady-State Operation

• Reference: §§5.1.1, 5.3.1
• Requirement: Equipment must function properly with input voltage up to 33 VDC (including ripple).
• Ripple Limits (5.1.1.2):
• Injected ripple up to ±2V (4V peak-to-peak).
• Emitted ripple ≤ ±1V (2V peak-to-peak).
• Pass Criteria (5.3.1): No functional degradation while operating over the specified steady-state range.
• Equipment:  
• 110-35R-TS 4-quadrant amplifiers with control and monitoring built in.
• 1kW
• -30 to +35V, 38Amps (28A High range)
• DC ... 200 kHz full range bandwidth
• Scalable up to 18kW,  684 Amps+
• O’Scope 350MHz BW is acceptable for all testing

2.2 Starting Operation

• Reference: §§5.1.2, 5.3.2
• Requirement: Equipment must operate during engine starting disturbances.
• Initial Engagement Surge (IES): Down to 12V for up to 1second.
• Cranking Voltage: Down to 16V for up to 30seconds.
• Pass Criteria (5.3.2): Equipment demonstrates normal operation with no damage or reset.
• Equipment:  
• 110-35R-TS 4-quadrant amplifiers with control and monitoring built in.
• 1kW
• -30 to +35V, 38Amps (28A High range)
• DC ... 200 kHz full range bandwidth
• Scalable up to 18kW,  684 Amps+
• Alternative: CS101 setup can be used also available MGA 1033

2.3 Transient Disturbances

• Reference: §§5.1.3, 5.3.3

2.3.1 Voltage Spikes

• Paragraphs: §§5.1.3.1, 5.3.3.1
• Injected Spikes (5.1.3.1.1):
• Up to 250V peak (±), ≤50ns rise time, ≤200mJ energy.
• Minimum 50 spikes of each polarity.
• Emitted Spikes (5.1.3.1.2):
• Must not exceed 250V or 125mJ per event.
• Evaluated during switching of inductive loads or similar scenarios.
• Pass Criteria (5.3.3.1): Normal functionality maintained; spikes remain within specified envelope if emitted.
• Equipment
• PG1275F (PG1275E for “E” Standard)

§  Differential voltage probe x1

• O’Scope 350MHz BW is acceptable for all testing

2.3.2 Voltage Surges

• Paragraphs: §§5.1.3.2, 5.3.3.2
• Injected Surges (5.1.3.2.1):
• Simulate “load dump” up to ~100V peak.
• Rise time 1–10?ms; total surge duration up to 500?ms.
• Applied repeatedly under worst-case load conditions.
• Emitted Surges (5.1.3.2.2):
• Measured during load switching or similar operations.
• Must remain within surge limits of Figure?8 (standard).
• Pass Criteria (5.3.3.2): No damage or operational failure; surge amplitudes/energy must stay within specified limits if emitted.
• Equipment
• PG1275F (PG1275E for “E” Standard)
• + DM400 for EUT current > 16 amps > 400 amps

§  Differential voltage probe x2

• O’Scope 350MHz BW is acceptable for all testing

2.4 Reverse Polarity

• Reference: §§4.1, 5.3.4
• Requirement: Equipment must withstand 33VDC applied in reverse for 5minutes without exceeding normal operating current.
• Pass Criteria (5.3.4): No permanent damage; normal operation resumes once correct polarity is restored.
• Equipment:  
• 110-35R-TS 4-quadrant amplifiers with control and monitoring built in.
• 1kW
• -30 to +35V, 38Amps (28A High range)
• DC ... 200 kHz full range bandwidth
• Scalable up to 18kW,  684 Amps+

3. Other Considerations

• Electromagnetic Compatibility (4.2, 5.3.5): EMI/EMC are addressed under separate standards (e.g., MIL-STD-461).
• All EMC options available from Absolute EMC
• Electrostatic Discharge (4.3, 5.3.6): ESD immunity also follows other standards; it is mentioned here but not tested within MIL-STD-1275F.
• ESD Onyx 30

4. Conclusion

Compliance with MIL-STD-1275F  requires verifying equipment performance under steady-state voltages (up to 33VDC), starting disturbances (down to 12V), voltage spikes (250V), voltage surges (~100V), and reverse polarity (33V in reverse). Paragraphs 5.1–5.3 detail the specific tests, limits, and pass/fail criteria. Meeting these requirements ensures reliable, damage-free operation of 28VDC utilization equipment on military ground vehicles.