1、 MIL-HDBK-704-8 9 April 2004 DEPARTMENT OF DEFENSE HANDBOOK GUIDANCE FOR TEST PROCEDURES FOR DEMONSTRATION OF UTILIZATION EQUIPMENT COMPLIANCE TO AIRCRAFT ELECTRICAL POWER CHARACTERISTICS 28 VDC ( PART 8 OF 8 PARTS ) This Handbook is for guidance only. Do not cite this document as a requirement. AMS
2、C N/A AREA SESS NOT MEASUREMENT SENSITIVE Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 ii FOREWORD 1. This handbook is approved for use by all Departments and Agencies of the Department of Defense. 2. This handbook provides guidance
3、 on test procedures for demonstration of 28 VDC utilization equipment to determine compliance with the applicable edition of MIL-STD-704. 3. MIL-HDBK-704-8 is Part 8 in a series of 8 Parts. Part 8 describes the test methods and procedures to demonstrate that 28 VDC utilization equipment is compatibl
4、e with the electric power characteristics of MIL-STD-704. These series of handbooks and MIL-STD-704 are companion documents. 4. Comments, suggestions, or questions on this document should be addressed to Commander, Naval Air Systems Command, Code 4.1.4, Highway 547, Lakehurst, NJ 08733-5100 or email
5、 to thomas.omaranavy.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at www.dodssp.daps.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 ii
6、i CONTENTS PARAGRAPH PAGE FOREWORD ii 1. SCOPE . 1 1.1 Scope. 1 2. APPLICABLE DOCUMENTS 1 2.1 General 1 2.2 Government documents 1 2.2.1 Specifications, standards and handbooks 1 3. DEFINITIONS 1 3.1 Acronyms and definitions. 1 4. TEST METHODS INFORMATION 1 4.1 Demonstration of compatibility 1 4.1.1
7、 Recording performance. 1 4.2 Calibration of test equipment 1 4.3 Test methods . 2 5. TEST METHODS.3 METHOD LDC101 Load Measurements 4 METHOD LDC102 Steady State Limits for Voltage 9 METHOD LDC103 Voltage Distortion Spectrum 13 METHOD LDC104 Total Ripple 20 METHOD LDC105 Normal Voltage Transients. 2
8、5 METHOD LDC201 Power Interrupt . 36 METHOD LDC301 Steady State Limits for Voltage 41 METHOD LDC302 Abnormal Voltage Transients. 45 METHOD LDC401 Steady State Limits for Voltage 57 METHOD LDC501 Starting Voltage Transients 61 METHOD LDC601 Power Failure 66 METHOD LDC602 Phase Reversal 70 6. NOTES .
9、75 6.1 Intended use 75 6.3 Subject term (keyword) listing 75 TABLE LDC-I. Summary of 28 VDC utilization equipment MIL-STD-704 compliance tests 2 CONCLUDING MATERIAL 75 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 1 1. SCOPE 1.1 Scop
10、e. This handbook provides, as guidance, test methods used to demonstrate that 28 VDC utilization equipment is compatible with the electric power characteristics of the applicable edition(s) of MIL-STD-704. This handbook is for guidance only and cannot be cited as a requirement. 2. APPLICABLE DOCUMEN
11、TS 2.1 General. The documents listed below are not necessarily all of the documents referenced herein, but are those needed to understand the information provided by this handbook. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and
12、handbooks form a part of this document to the extent specified herein. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-704 DoD Interface Standard for Aircraft Electric Power Characteristics (Copies of these documents are available online at http:/assist. daps.dla.mil/quicksearch or www.dodssp.daps.mil/ or f
13、rom the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 3. DEFINITIONS 3.1 Acronyms and definitions. The acronyms and definitions of MIL-STD-704 are applicable to this handbook. 4. TEST METHODS INFORMATION 4.1 Demonstration of compatibility. This s
14、ection contains the test methods which will ensure that 28 VDC utilization equipment is compatible with the electric power characteristics of the applicable edition(s) of MIL-STD-704, by testing the Unit Under Test (UUT) in accordance with the test procedures as described in test methods LDC101 thro
15、ugh LDC602. 4.1.1 Recording performance. In table LDC-I, record the edition(s) of MIL-STD-704 that defined the aircraft electric power characteristics used for testing and the performance of the UUT for each of the test methods. 4.2 Calibration of test equipment. Test equipment and accessories requi
16、red for measurement in accordance with this handbook should be calibrated in accordance with an approved calibration program traceable to the National Institute for Standards and Technology. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-70
17、4-8 2 The serial numbers, model, and calibration date of all test equipment should be included with the test data. 4.3 Test methods. The test methods listed in table LDC-I are provided in section 5 of this handbook. TABLE LDC-I. Summary of 28 VDC utilization equipment MIL-STD-704 compliance tests. U
18、UT: Compliance to MIL-STD-704 Edition(s): Test Dates: Test Method Description Performance (Pass/Fail) Comments Normal, Aircraft Electrical Operation LDC101 Load Measurements LDC102 Steady State Limits for Voltage LDC103 Voltage Distortion Spectrum LDC104 Total Ripple LDC105 Normal Voltage Transients
19、 Transfer, Aircraft Electrical Operation LDC201 Power Interrupt Abnormal, Aircraft Electrical Operation LDC301 Abnormal Steady State Limits for Voltage LDC302 Abnormal Voltage Transients (Overvoltage/Undervoltage) Emergency, Aircraft Electrical Operation LDC401 Emergency Limits for Voltage Starting,
20、 Aircraft Electrical Operation LDC501 Starting Voltage Transients Power Failure, Aircraft Electrical Operation LDC601 Power Failure LDC602 Polarity Reversal Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 3 5. TEST METHODS Provided by
21、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 4 METHOD LDC101 Load Measurements POWER GROUP: 28 Volt DC AIRCRAFT ELECTRICAL OPERATING CONDITION: Normal PARAMETER: Load Measurements 1. Scope. 1.1 Purpose. This test procedure is used to verify tha
22、t 28 volt DC power utilization equipment meets the load limits, inrush limits, current distortion limits and current spectrum limits that may be required by the utilization equipment performance specification document. 2. Validation criteria. If required by the utilization equipment performance spec
23、ification document, the utilization equipment is considered to have passed if the utilization equipment is within the load limits, inrush current limits, the current distortion limit, and the current spectrum limits specified in the utilization equipment performance specification document. As noted
24、in table LDC101-I, the load limits, inrush current limits, the current distortion limit, and the current spectrum limits are not specified in MIL-STD-704 versions A through F. The utilization equipment must not suffer damage or cause an unsafe condition. Note: The utilization equipment performance s
25、pecification document should include requirements that reduce the likelihood of the equipment having an adverse effect on the electrical power characteristics of the aircraft. Load, inrush currents, current distortion and current spectrum limits may be imposed to minimize undesirable effects to the
26、electrical power characteristics. These limits should take into account the utilization equipment power draw, aircraft electrical system capacity and distribution characteristics, trade-offs with weight, volume, cost, and reliability that are specific to each type of equipment and aircraft. TABLE LD
27、C101-I. MIL-STD-704 limits for load, inrush current, current distortion factor, and current spectrum for 28 volt DC utilization equipment. Limit 704A 704B 704C 704D 704E 704F Inrush Current N/A1/N/A1/N/A1/N/A1/N/A1/N/A1/Load (VA) N/A1/N/A1/N/A1/N/A1/N/A1/N/A1/Current Distortion Factor N/A1/N/A1/N/A1
28、/N/A1/N/A1/N/A1/Current Spectrum N/A1/N/A1/N/A1/N/A1/N/A1/N/A1/1/. Limits for Load, Inrush Current, Current Distortion Factor, and Current Spectrum must be defined in the utilization equipment performance specification document and are unique to each equipment. Provided by IHSNot for ResaleNo reprod
29、uction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 5 3. Apparatus. The test equipment should be as follows: a. Adjustable DC power supply b. True RMS voltmeter c. Power meter d. Spectrum analyzer e. Distortion meter f. Current transformer g. Oscilloscope 4. Test setup. Config
30、ure the test setup as shown in figure LDC101-1. Measurements, except current, must be made within 10 cm of the input power terminals of the UUT. The current measurement must be taken from the 28 volt DC conductor. 5. Compliance test. With the power source off, install the UUT and the stimulation and
31、 monitoring equipment into the test setup of figure LDC101-1. Turn on the power source and adjust the voltage to the nominal steady state voltage of 28 VDC. If the utilization equipment performance specification document: a. Imposes inrush current limits, close the circuit breaker, energizing the UU
32、T. Record the inrush current in the data sheet shown in table LDC101-II and compare with the limits of utilization equipment performance specification document. Allow sufficient time for the UUT to warm up. Conduct a performance test of the UUT according to the utilization equipment performance test
33、 procedures to verify that the UUT is providing specified performance for normal aircraft electrical conditions. Repeat for each mode of operation of the UUT. b. Imposes load limits, energize the UUT. Allow sufficient time for the UUT to warm up. Conduct a performance test of the UUT according to th
34、e utilization equipment performance test procedures to verify that the UUT is providing specified performance for normal aircraft electrical conditions. Record the load (Volt-Amps) and the voltage in the data sheet shown in table LDC101-II and compare with the limits of utilization equipment perform
35、ance specification document. Repeat for each mode of operation of the UUT. c. Imposes current distortion limits, energize the UUT. Allow sufficient time for the UUT to warm up. Conduct a performance test of the UUT according to the utilization equipment performance test procedures to verify that the
36、 UUT is providing specified performance for normal aircraft electrical conditions. Record the current distortion factor in the data sheet shown in table LDC101-II and compare with the limits of utilization equipment performance specification document. Repeat for each mode of operation of the UUT. d.
37、 Imposes current spectrum limits, energize the UUT. Allow sufficient time for the UUT to warm up. Conduct a performance test of the UUT according to the utilization equipment performance test procedures to verify that the UUT is providing specified performance for Provided by IHSNot for ResaleNo rep
38、roduction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 6 normal aircraft electrical conditions. Record the current spectrum (current amplitude vs. frequency) in the data sheet shown in table LDC101-II and compare with the limits of utilization equipment performance specificati
39、on document. Repeat for each mode of operation of the UUT. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 7 Unit Under Test(UUT)AdjustableDC PowerSupplyStimulation & MonitoringEquipment(See Note 4)+Ground Plane-GNDSee Note 110 cm+-CHA
40、SSISSee Note 2CAUTIONHall EffectCurrent ProbeNotes:1. Voltage measurements shall be made within 10 cm of UUT input power terminals.2. CAUTION: Verify suitability of power supply MINUS and GROUND connections.3. CAUTION: Verify suitability of instrumentation inputs and/or use appropriate attenuation.4
41、. Stimulation and Monitoring Equipment are user defined. This functional block shall provide appropriateinputs (stimulations) and monitor UUT outputs (e.g.: RPM, signals, data, etc.)Normal Operation - Load and Current Distortion MeasurementFigure LDC 101-1(See Note 5)True RMSVoltmeterPowerMeterSpect
42、rumAnalyzerOscilloscope DistortionMeter(See Note 3) (See Note 3)(See Note 3)(See Note 3)(See Note 3)FIGURE LDC101-1. Normal operation - load and current distortion measurement. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 8 TABLE LD
43、C101-II. Sample data sheet for LDC101 load measurements. Parameter Measurement Unit Performance Pass/Fail Inrush Current Amps Voltage VdcN/A Load (VA) VA Total Current Distortion % Current Distortion Current Spectrum Attach Spectrum Plot Amplitude vs. Frequency Provided by IHSNot for ResaleNo reprod
44、uction or networking permitted without license from IHS-,-,-MIL-HDBK-704-8 9 METHOD LDC102 Steady State Limits for Voltage POWER GROUP: 28 Volt DC AIRCRAFT ELECTRICAL OPERATING CONDITION: Normal PARAMETER: Steady State Limits for Voltage 1. Scope. 1.1 Purpose. This test procedure is used to verify t
45、hat 28 volt DC power utilization equipment operates and maintains specified performance when provided power with voltage at that the Normal Low Steady State (NLSS) limits and the Normal High Steady State (NHSS) limits as specified in the applicable edition(s) of MIL-STD-704. 2. Validation criteria.
46、The utilization equipment is considered to have passed if the utilization equipment operates and maintains performance as specified in the utilization equipment performance specification document for normal aircraft electrical conditions when supplied input power of voltage at the specified normal s
47、teady state limits of the applicable editions(s) of MIL-STD-704 and as noted in table LDC102-I. The utilization equipment must maintain specified performance for a length of time that confirms the utilization equipment can continuously operate at the steady state voltage and frequency limits and sho
48、uld be not less than thirty (30) minutes for each of the test conditions. The utilization equipment must demonstrate re-start at the steady state voltage limits. The utilization equipment must not suffer damage or cause an unsafe condition. Note: If the utilization has exactly the same full performa
49、nce requirements for abnormal steady state limits and emergency steady state limits as required for the normal aircraft electrical conditions, then performance of test methods LDC301 and LDC401 will constitute performance of LDC102. TABLE LDC102-I. MIL-STD-704 normal limits for steady state voltage. Normal Limit 704A 704B 704C 7
