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Compliance West MegaPulse 746EP Surge Testing of Conformal Coatings

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UL 746E Section 19 covers requirements for conformal coatings used instead of electrical spacings to increase the dielectric withstand voltage between traces on a printed-wiring board. Paragraph 19.3 outlines a Voltage transient test to be applied to a specific test pattern allows testing to determine spacings. The Surge Generator circuit is specified in UL 746E, Figure 19.2 is contained in the MegaPulse 746E. One press of the MegaPulse 746E TRIGGER button conducts the test suite as described in UL 746E, Para. 19.3.

Note: Voltages 400V and over are certified to be in accordance with the tolerances of IEC 1180-1, Para. 6.2.2.

Provided with external interlock control. In addition, for automated testing, the MegaPulse 746E is available with TestMinder, Compliance West's computer control and test reporting option, and Arc Detect, which can detect and report an insulation failure. When both of these options are ordered together, the computer-generated test report will advise which tests passed and which failed.

UL 746E Section 19 covers requirements for conformal coatings used instead of electrical spacings to increase the dielectric withstand voltage between traces on a printed-wiring board.

  • Output: In accordance with UL 746E, Para. 19.3, a-c
  • Voltage Rise Time: +/- 30% (400V +)
  • Voltage Fall Time: +/- 20% (400V +)
  • Source Impedance: 50ohm +/- 10%
  • Source Energy: not defined
  • Mode of Operation: Automatic; stop with external interlock
  • Charge Time: <60 sec

    The MegaPulses are used with a general purpose oscilloscope for waveform capture and evaluation.

    The MEGAPULSE 746E is designed to test Conformal Coatings in accordance with UL 746E, Paragraph 19.3 at up to 6kV.

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