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Title
Testing a GDT
URL Name
Testing-a-GDT
Summary
How to test a Gas Discharge Tube (GDT)
Owner
Mike Sotelo

Question
Content

To test a GDT with a multimeter do the following

 

  • Set your multimeter to the resistance (ohms) or continuity mode.
  • Place the probes across the GDT terminals.
  • A healthy GDT should read OL (open line) or extreme megaohms of resistance.

 

Testing the actual breakdown voltage requires a variable high-voltage DC power supply with a strict current-limiting resistor (such as 100kΩ) or a specialized GDT/insulation tester. 

Internal Notes

Digital Engagement Response

Article Created Date
7/28/2026, 2:59 PM
Publication Status
Published
Created Date
7/28/2026, 2:59 PM
Article Total View Count
22
Created By
Mike Sotelo, 7/28/2026, 2:59 PM
Archived Date
Last Modified Date
7/28/2026, 3:00 PM
Last Modified By
Mike Sotelo, 7/28/2026, 3:00 PM
Last Published Date
7/28/2026, 3:00 PM

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Testing a GDT