MIL-STD-1399-300 Electric Power, Alternating CurrentThis military standard section establishes electrical interface characteristics for shipboard equipment utilizing AC electric power to ensure compatibility between user equipment and the electric power system. Characteristics of the electric power system are defined and tolerances are established, as well as requirements and test methods for ensuring compatibility of shipboard user equipment with the power system. The policies and procedures established by MIL-STD-1399 are mandatory. This section and the basic standard are to be viewed as an integral single document for use in the design and testing of electric power systems and user equipment.

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MIL-STD-1399-3008

5.3.8  Voltage and frequency modulation test.  User equipment performance shall be evaluated under the voltage modulation and frequency modulation conditions specified in Table I, items 3 and 10, and further expanded in Table VII (see 3.3.3 and 3.4.4).  The periodicity of voltage modulation should be considered to be longer than 1 cycle time at nominal frequency and less than 10 seconds.  The periodicity of frequency modulation should be considered as not exceeding 10 seconds.

TA8LE VII.  Voltage and frequency modulation test.

5.3.8.1  Apparatus.  The following apparatus is recommended for performing this test:

a.    Power source of required capacity and range of voltage and frequency adjustments.  A power source with a capability of having an independently programmable voltage and frequency output is recommended.

b.    Voltmeters (true rms) - ±0.5 percent accuracy. c.    Frequency meter - ±0.5 Hz accuracy.

d.    Storage oscilloscope having � 500 kHz response per channel.

e.    Current and potential transformers and probes as required. f.     Temperature meter - ±0.5 °C accuracy.

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