Military Ground & Shipboard
Testing vehicle electronics, shipboard converters, deployable power systems on 28 VDC, 270 VDC, 440 V 60 Hz shipboard. What you are proving is survivability on a bus shared with motors, weapons and generators.
- Device under test
- vehicle electronics, shipboard converters, deployable power systems
- Bus
- 28 VDC, 270 VDC, 440 V 60 Hz shipboard
- Who buys this
- defence primes and depot sustainment programmes
Ground and shipboard platforms live on the DC side of this standard. The 400 Hz AC clauses are not your test — the 28 V and 270 V bus behaviour is.
Where programmes get caught out
No 400 Hz means no aircraft source
Buying an aviation-grade AC source for a ground platform is a common and expensive mis-spec. The DC clauses are the requirement.
Engine-start droop is the hard case
A slow ramp from deep undervoltage exercises hold-up behaviour that a step transient never reaches.
Depot sustainment outlives the instrument
Programmes running 20+ years should confirm calibration and support horizons before standardising a rack.
Where the standards have moved
Revision status changes what your report has to cite. Every note below carries the record it came from, retrieved on the date shown.
MIL-STD-1399-300B was cancelled in 2018 and most published summaries have not caught up
Notice 1 of 25 September 2018 cancelled MIL-STD-1399-300B (24 April 2008) and superseded it with MIL-STD-1399-300-1, Section 300 Part 1, Low Voltage Electric Power, Alternating Current. Medium-voltage systems moved to Part 2. Vendor pages and test-lab capability sheets still cite 300B routinely. Check which one your contract invokes before the acceptance procedure is written, because the part numbering alone will not tell you.
Source: MIL-STD-1399 Section 300 document record and Notice 1 — Defense Logistics Agency, ASSIST QuickSearch. Retrieved 2026-08-24.
Shipboard is three power types, and two of them are 400 Hz
In the superseded 300B text — still the most widely republished version — Type I is 440 V rms, 60 Hz, three-phase ungrounded ship service power, with 115 V rms derived through transformers. Types II and III are 440 V rms 400 Hz, and Type III 115/200 V rms 400 Hz three-phase four-wire grounded wye is the supply provided for avionics shops and aircraft servicing. Type I and Type II characteristics were coordinated with STANAG 1008 Edition 8. A bench built only for 60 Hz cannot cover a shipboard programme that reaches the aviation side of the ship. We have not read the current 300-1 text, so treat those figures as the superseded revision until you have the current document.
Source: MIL-STD-1399 Section 300B, §5.1.1 — US Navy, NAVSEA (public copy). Retrieved 2026-08-24.
Testing to a standard
The clause-by-clause limits, and what each standard deliberately says nothing about.
- MIL-STD-704F
Testing military to MIL-STD-704F
Turns on 400 Hz, voltage transients.
- MIL-STD-461G CS101
Testing military to MIL-STD-461G CS101
Turns on audio-frequency ripple injection, series coupling onto power leads.
- MIL-STD-461G CS101
Testing military to MIL-STD-461G CS101
Turns on audio-frequency ripple injection, series coupling onto power leads.
Equipment for this work
- AFV+ Programmable AC Source15 kVA – 2 MVAHigh-power cabinet-format programmable AC source spanning the range between bench units and full grid simulators.
- AFC Series AC Source / Frequency Converter0.5 kVA – 2 MVAClean bulk AC source and frequency converter, supplied by Intepro as an alternative to rotary motor-generator conversion.
- Vega Series Customizable Power Racks15 kW – 480 kWCustomisable high-power racks built from 15 kW 3U regenerative loads and DC supplies — mixed and matched to the test requirement rather than bought as a fixed configuration.
- AMF Series 400Hz AC Source / Ground Power Unit500 VA – 400 kVAProgrammable 400Hz AC source for aerospace and defence — laboratory use, hangar and repair-station ground power, airports and factories.
Specifying a bench for military?
Send the clause you have to satisfy rather than a shopping list. An engineer will tell you what the rig has to do — including the parts of the programme this equipment does not cover.
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