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This document presents recommendations for good cabling design to ensure electro-magnetic electromagnetic compliance (EMC) of the simulator. Failing to follow the recommendations might lead to energy transfer in electro-magnetic electromagnetic interference (EMI) that can disturb the equipment in the neighbor environment.

Cable component items

  • Ferrite clamp of proper circumference
  • Twisted pair wires for signal and power
  • Shield

Analog Cable assembly

The D-sub37 cable used for the analog IO must follow the recommendations:

  • Data should be cabled in twisted pairs.
  • Cables should have a shield around the data.
  • One shield per type of IO and direction.
  • The shield should be connected to the connectors’ shell/casing at both ends.
  • The shells/casings should be connected to the chassis earth ground on both equipment.
  • The total cable length should be less than

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  • 3 m (9 feet).

Digital Cable Assembly

The D-sub37 cable used for the digital IO must follow the recommendations:

  • Data should be cabled in twisted pairs.
  • Cables should have a shield around the data.
  • One shield per type of IO and direction.
  • The shield should be connected to the connectors’ shell/casing at both ends.
  • The shells/casings should be connected to the chassis earth ground on both equipment.
  • The total cable length should be less than

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  • 3 m (9 feet).
  • For Digital Output cables, the VUser_RTN signal should be connected to the shell/casing of the cable with a 100nF capacitor on both ends.
  • The cable should have a ferrite clamp on the Digital Output side.
    • During EMC certification, Opal-RT used 3 clamps (Laird-Signal Integrity Products #28A2913-0A2) mount like in figure 1.


Figure 1: Simulator DB37 digital output connector side.

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  1. Power connections should use twisted pairs.
  2. Cable should have a shield around the twisted pairs.
  3. One shield per type of IO and direction.
  4. The shells/casings should be connected to the chassis earth ground on both equipment.
  5. The total cable length should be less than 3m 3 m (9 feet).
  6. The cable should have a ferrite clamp on the Digital Output side.
    • During EMC certification, Opal-RT used the clamp (Laird-Signal Integrity Products #28A2736-0A2) mount with multiple turns like in figure 2.

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