LDC301 VOLTAGE STEADY STATE LIMITS TEST
LDC301 Voltage Steady State Limits Test
The MIL-STD-704 Aircraft Electric Power Characteristics standard, prepared by the U.S. Department of Defense, defines
electrical power requirements for military aircraft and airborne equipment, including voltage, frequency, phase, ripple, and maximum current.
The most recent revision is MIL-STD-704F_CHG-1, published in 2016. This standard is not limited to the U.S. military and its subcontractors;
it is also widely recognized worldwide for assessing the compliance of military aircraft and associated systems.
Aircraft electrical power supplied in accordance with MIL-STD-704 is converted to the voltage levels required for onboard equipment operation.
To demonstrate conformity with MIL-STD-704, equipment is required to undergo the applicable MIL-STD-704 test sequences to evaluate the effects of defined
power conditions and verify compliance.
The LDC301 Voltage Steady State Limits Test is performed to verify that 28 VDC utilization equipment continues to operate and maintains
the specified performance when power is applied at the Abnormal Low Steady State (ALSS) and Abnormal High Steady State (AHSS) limits.
The test duration is at least 30 minutes.
Objective Purpose
- To verify, through the LDC301 Voltage Steady State Limits Test, that 28 VDC utilization equipment operates and maintains the specified performance when power is applied at the ALSS and AHSS limits.
- To evaluate the effects of defined power conditions and verify compliance by completing the applicable MIL-STD-704 test sequences.
- To confirm that aircraft power supplied in accordance with MIL-STD-704 is converted to the voltage levels required for utilization equipment operation.
Test Scope Scope
- During the LDC301 Voltage Steady State Limits Test, the utilization equipment is considered acceptable per MIL-STD-704 and the applicable table if, when input power is applied at the specified abnormal steady-state limits of the current revision(s), it operates and maintains performance as stated in the utilization equipment performance specification for abnormal aircraft electrical conditions.
- The utilization equipment shall maintain the specified performance for a period sufficient to demonstrate continuous operation at the steady-state voltage; the duration shall not be less than thirty (30) minutes for each test condition.
- Unless otherwise specified in the utilization equipment performance specification, the utilization equipment shall demonstrate restart capability at the abnormal steady-state voltage limits during the LDC301 Voltage Steady State Limits Test.
Technical Approach Process
- Unless otherwise specified in the utilization equipment performance specification, when power returns to normal limits, operation shall automatically return to the specified performance for normal aircraft electrical conditions.
- During the LDC301 Voltage Steady State Limits Test, the utilization equipment shall not be damaged or create any unsafe condition.
- At our STEST facility in Ankara, accredited by TURKAK, we perform the LDC301 Voltage Steady State Limits Test within the scope of MIL-STD-704 in accordance with TS EN ISO/IEC 17025.
Typical Applications Use
- MIL-STD-704 is widely recognized worldwide for the compliance assessment of military aircraft and associated systems.
- Verification that 28 VDC utilization equipment operates and maintains performance when power is applied at the ALSS and AHSS limits.
- Contact us for Environmental, EMI/EMC, and ATP testing requirements to enhance the quality and reliability of your products.
At our STEST facility in Ankara, accredited by TURKAK, we perform the LDC301 Voltage Steady State Limits Test within the scope of the MIL-STD-704 Aircraft Electric Power Characteristics standard in accordance with TS EN ISO/IEC 17025. For your Environmental, EMI/EMC, and ATP testing requirements to enhance product quality and reliability, you may contact us.
REQUEST A TEST APPOINTMENT| Nominal Limits | 704A | 704B | 704C | 704D | 704E | 704F |
|---|---|---|---|---|---|---|
| Voltage (NLSS) | 24 Vdc | 22 Vdc | 22 Vdc | 22 Vdc | 22 Vdc | 22 Vdc |
| Voltage (NHSS) | 28.5 Vdc | 29 Vdc | 29 Vdc | 29 Vdc | 29 Vdc | 29 Vdc |