13 – “Checklist” para Dispositivos Eletro-pirotécnicos, EMI, EMC e ESD.

13.1 – Electro-Explosive Devices Checklist



(a) Does the design of explosive or propulsive items comply with the appropriate requirements and will there be correct function when intentionally demanded?


(a) Has provision been made to ensure that Electro-Explosive Devices (EED) cannot be initiated unintentionally by:

(i) Electrolytic effects?

(ii) Electrostatic effects?

(iii) Thermo-electric effects?

(iv) Induction from electrical transients?

(v) Induction from AC power sources?

(vi) Induction from RF sources?

(vii) Fault conditions?

(viii) Lightning strikes?

(ix) Shock effects?

(x) Nuclear effects?

(xi) Human error?

(b) Has provision been made to ensure EEDs can only be initiated in the ‘armed’ condition?

(c) Does the ‘safe arming distance’ of missiles allow for violent manoeuvres immediately after launch?

(d) Has protection been provided against exposure and proximity to:

(i) Heat sources including fire?

(ii) Flammable fluids?

(iii) High electric or magnetic fields?

(e) Are all firing circuit controls clearly labeled as to function?

(f) Are starting positions of all rotary controls clearly marked?

(g) Is chemical stability of the explosive commensurate with the environmental requirements for the explosive component?

(h) Is there any incompatibility between the explosive filling and any other material used in the manufacture of the explosive component which could result in chemical changes which will cause premature degradation of the safety of the explosive component during its planned life?



Applied R&M Manual for Defence SystemsPart C – Techniques. Página da Internet. Disponível em URL: < http://www.sars.org.uk/old-site-archive/BOK/Applied%20R&M%20Manual%20for%20Defence%20Systems%20%28GR-77%29/p3c23.pdf >, p. 17.Acessado em 2013.

13.2 – “EMI checklist”

Título da publicação:

“Small Explorer-Fast Auroral Snapshot “SMEX-FAST” Magnetic Contamination and EMI/EMC Control and Implementation Plan”


“1.0                INTRODUCTION

This document establishes the Electromagnetic Compatibility (EMC), Electromagnetic Interference (EMI), electrostatic cleanliness, and magnetic cleanliness details for the Small Explorer-Fast Auroral Snapshot (SMEX-FAST) mission being developed by the Goddard Space Flight Center (GSFC) and the University of California, Berkeley (UCB). These details consist of the project management plan, performance requirements, design guidelines and quality assurance requirements needed to assure that the SMEX_FAST spacecraft will be electromagnetically, electrostatically and magnetically compatible with the environment, the Pegasus launch vehicle, and itself throughout all phases of the mission.


“8.2 EMI checklists

These checklists have been provided as a helpful reminder of good EMI control practices.  A ‘yes’ or ‘not applicable’ answer to any question requires no further thought.  A ‘no’ answer requires careful consideration of the potential EMI impact and should be resolved by discussion with the electrical systems engineer.

8.2.1       Checklist A: circuits to be shielded and filtered

  1. Have chopper, converter, relay, motor, clock or timing circuits with fast rise time or high PRF, and similar circuits been filtered using filters selected for their attenuation characteristics at the noise frequencies?
  2. Has the DC-DC converter transformer been electrostatically shielded?
  3. Has bandpass filtering been used on transmitter outputs or receiver inputs?
  4. Is the shielding material suitable for the frequency range of interest?
  5. Have decoupling capacitors been used on internal power connections?
  6. Have shielded subassemblies been used in the equipment?
  7. Have RF chokes and inductors been used to confine the RF energy to the desired circuits?
  8. Have low-level or susceptible circuits been physically separated from EMI producing circuits within an enclosure?
  9. Have toroids been used to minimize the leakage field of inductors and have inductors been cross-oriented to minimize coupling?
  10. What effect do vent holes have on the box’s radiated emissions? 

8.2.2 Checklist B: elimination of spurious responses

  1. Have short lead lengths been used for all circuits, especially capacitors in RF circuits?
  2. Has damping been used in circuits capable of oscillation?
  3. Have critical dimensions been avoided, considering the enclosure as an RF cavity?
  4. Have all feedback loops been designed to prevent oscillation under worst-case conditions?
  5. Have high-power and low-power stages of units been isolated?
  6. Is the proposed enclosure bonding adequate at the known critical radio frequencies?
  7. Have components that are not self-resonant in the intended frequency range been used except when required by the circuit functionality?

 8.2.3 Checklist C: selection of components

  1. Are diodes or other suppression components being used across relay coils?
  2. Are R-C circuits being used across relay contacts?
  3. Are capacitors being used directly across DC motor brushes?
  4. Are toroids or other low-leakage inductors being used?
  5. Are separate connectors being used for sensitive and EMI-producing circuits?
  6. Is twisted-pair and/or shielded wiring being used?
  7. Is balanced-circuit design being used?

8.2.4 Checklist D: electro-explosive devices

  1. Has the EED been bonded to the structure per MIL-B-5087?
  2. Have firing circuit conductors been routed as twisted-shielded pairs?
  3. Have bundle shields been circumferentially-terminated?
  4. Have EED cables been isolated in accordance with the wire harness separation classifications?
  5. Internal to components, has EED wiring been isolated from all other wires?
  6. Have separate connectors been provided for EED wiring?


SMEX-FAST”. Small Explorer-Fast Auroral Snapshot. Magnetic Contamination and EMI/EMC Control and Implementation Plan. Goddard Space Flight Center (GSFC) and the University of California, Berkeley (UCB). 1993. p. 16. Página da Internet. Disponível em URL: < ftp://apollo.ssl.berkeley.edu/pub/THEMIS/1%20Management/1.3%20Systems%20Engineering/FAST_Archives/FAST%20PROC%20115.pdf >. Acessado em 2013.

13.3 – “When Lightning Strikes”

Título da publicação:

“When Lightning Strikes… Is Your Interconnect System Optimized for Electromagnetic Compatibility?”

Página da Internet. Disponível em URL: http://www.glenair.com/qwikconnect/pdf/2008_january.pdf

Acessado em 2013.

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