MIL-HDBK-704-7 Department of Defense Handbook: Guidance for Test Procedures for Demonstrating Use of Equipment Compliant with Aircraft Electrical Power Specifications 270 VDC

The standard, "MIL-HDBK-704-7 Department of Defense Handbook: Guidance for test procedures for demonstration of 270 VDC utilization equipment conforming to aircraft electrical power specifications", a United States military defense standard, provides guidance on test procedures for demonstration of 704 VDC utilization equipment to determine compliance with the applicable version of MIL-STD-270.

This standard specifies test methods and procedures to demonstrate that 270 VDC utilization equipment complies with the electrical power specifications of the MIL-STD-704 standard.

Test methods described in this standard include:

• HDC101 Load measurements: This test procedure is used to verify that 270-volt DC power-using equipment meets load limits, input limits, current distortion limits, and current spectrum limits that may be required in the usage equipment performance specification document.
• HDC 102 Steady-state limits for voltage: This test procedure is used to verify that 270-volt DC power-using equipment operates and maintains specified performance when supplied with voltage within the normal low steady-state and normal high steady-state limits specified in applicable editions of the MIL-STD-704 standard.
• HDC 103 Voltage Distortion Spectrum: This test procedure is used to verify that 270-volt DC power-using equipment operates and maintains specified performance when subjected to voltage distortion of frequencies and amplitudes specified by the voltage distortion spectrum in applicable editions of the MIL-STD-704 standard.
• HDC 104 Total Surge: This test procedure is used to verify that 270-volt DC power-using equipment operates and maintains specified performance when subjected to a voltage having the surge specified in the current edition of the MIL-STD-704 standard.
• HDC 105 Normal Voltage Transients: This test procedure is used to verify that 270-volt DC power-using equipment maintains specified performance and operates when subjected to normal voltage transients specified in applicable editions of the MIL-STD-704 standard.
• HDC201 Power interruption: This test procedure is used to verify that 270-volt DC power-using equipment maintains specified performance and operates when subjected to power interruptions specified in applicable editions of the MIL-STD-704 standard.
• HDC301 Steady-State Limits for Voltage: This test procedure is used to verify that 270-volt DC power-using equipment operates and maintains specified performance when supplied with voltage above the abnormal low steady-state (ALSS) and abnormal high steady-state (AHSS) limits specified in applicable editions of the MIL-STD-704 standard.
• HDC302 Abnormal Voltage Transients: This test procedure is used to verify that 270-volt DC power-using equipment operates and maintains specified performance when subjected to abnormal voltage transients specified in applicable editions of the MIL-STD-704 standard.
• HDC401 Steady-state limits for voltage: This test procedure is used to verify that 270-volt DC power-using equipment operates and maintains specified performance when supplied with voltage at the emergency low steady-state limits and emergency high steady-state limits specified in applicable editions of the MIL-STD-704 standard.
• HDC501 Initial Voltage Transients: This test procedure is used to verify that 270-volt DC power-using equipment maintains specified performance and operates when subjected to initial voltage transients specified in applicable editions of the MIL-STD-704 standard.
• HDC601 Power Interruption: This test procedure is used to verify that 270-volt DC power-using equipment operates and maintains specified performance when subjected to power interruptions specified in applicable editions of the MIL-STD-704 standard.
• HDC602 Phase Reversal: This test procedure is used to verify that 270-volt DC power-using equipment is not damaged by phase reversal or that a positive physical method is used to prevent phase reversal.

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