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Teardown of a GM3120 electromagnetic radiation tester

Posted on Monday, May 21st, 2018 in Teardowns by DP

GM3120-600

Kerry Wong did a teardown of a cheap GM3120 field strength meter:

There are a lot of cheap electromagnetic radiation testers out there which boast some quite impressive claims. So I decided to pick up a popular one (GM3120) from eBay to see how well it works. And perhaps more importantly, I wanted to take a look inside to see how the E field and H field sensing is done.
Most professional field strength meters feature a dome-like sensor. Housed inside are three orthogonally arranged antennas used for picking up field component in that axis. A cheap tester like the GM3120 clearly doesn’t utilize this kind of sensor topology and presumably can only discern field strength along a single axis.

See the full post on his blog here.

Check out the video after the break.

This entry was posted on Monday, May 21st, 2018 at 11:35 pm and is filed under Teardowns. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

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