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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: A bit simplistic, eh? posted by Jon Risch on April 4, 2011 at 21:10:32:
In light of your questions, I repeated the same experiment tonight, but also tested a piece of TI-Shield instead of the bag of crystals. The first plot is the emission from the power supply with no shield, the second is the emission with a piece of TI-Shield between the supply and the probe, and the third is the emission with the TI-Shield grounded with a clip-lead. Once again, the crystals had no noticeable effect, and the plots looked the same as previously posted.
It is clear that the TI-Shield makes a noticeable reduction even in its ungrounded state. Once the shield is grounded, the signal is reduced to almost the level of the background. This control result shows that the system is indeed measuring the shielding effect of whatever is placed between the supply and the probe. It also shows that for the frequencies displayed in the plots, the crystals have no effect, but a known EMI shielding material such as TI-Shield is quite effective.
Based on these results, if you want to shield something from AC electrical fields (frequencies of 50/60Hz plus harmonics) inside your equipment, you are much better off using TI-Shield than using crystals.
SUPPLY EMISSION NO SHIELD:
EMISSION WITH UNGROUNDED TI-SHIELD:
EMISSION WITH GROUNDED TI-SHIELD:
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Follow Ups
- Additional Data for You, Jon, Validating the Measurement System - Maxamillion 18:23:46 04/05/11 (2)
- OK, but this shows that .... - Jon Risch 18:34:23 04/06/11 (1)
- RE: OK, but this shows that .... - Steve Eddy 09:52:51 04/07/11 (0)
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