MIL-STD 461 CS117

DEPARTMENT OF DEFENSE INTERFACE STANDARD

MIL-STD 461 CS117 Conducted Susceptibility, Lightning Induced Transients, Cables and Power Leads

This test procedure is used to verify the ability of the EUT to withstand lightning transients coupled onto EUT associated cables and power leads.

Applicability

This requirement is applicable to all safety-critical equipment interconnecting cables, including complete power cables, and individual high side power leads. It is also applicable to non-safety critical equipment with interconnecting cables/electrical interfaces that are part of or connected to equipment performing safety critical functions. It may be applicable to equipment performing non-safety critical functions when specified by the procuring activity. This requirement also has limited applicability to surface ship equipment which have cables routed above deck.

Limit

The EUT shall not exhibit any malfunction, degradation of performance, or deviation from specified indications, beyond the tolerances indicated in the individual equipment or subsystem specification, when subjected to the levels and lightning transients specified in Table VII and supplemented by the waveform and timing definitions shown on Figures CS117-1 through CS117-8. The applicable transients of Table VII are considered default values and waveforms based upon previous experience and shall be used for the defined equipment functionality when the host platform lightning transient data does not exist. In the event that there is platform lightning transient data available, this data may be used to tailor the requirements with different selected levels or waveforms, pending approval by the procuring activity. Note that the power lines are tested separately as well as within the bundle as defined in the test procedures section and are tested at the levels defined in Table VII.

Test Equipment

    
 	
  1. Lightning transient generator
    2. 
 	
  2. Injection Transformers
    3. 
 	
  3. Oscilloscope
    4. 
 	
  4. Current monitor probes
    5. 
 	
  5. Attenuators, 50 ohm, as needed on current monitor probes
    6. 
 	
  6. Voltage monitor probes, high impedance
    7. 
 	
  7. Monitor loop, low impedance wire loop
    8. 
 	
  8. Calibration loop, low impedance wire loop
    9. 
 	
  9. Capacitors, ≥ 28,000 μF for DC power inputs and 10 μF for AC power inputs
    10. 
 	
  10. LISNs
    11. 


Preview Standard
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