SilverStone SX800-LTI PSU Review

EMC Pre-Compliance Testing

EMC, EMI & EMS Acronyms

  • Electromagnetic Compatibility (EMC): The ability of a device to operate properly in its environment without disrupting the proper operation of other nearby devices.
  • Electromagnetic Interference (EMI): This represents the electromagnetic energy a device emits, which can cause problems in other nearby devices if it is too high.
  • Electromagnetic Immunity (EMS): The tolerance to electromagnetic emissions.

Equipment & Standards

To properly measure the EMI that a device emits, you need special equipment defined by the CISPR 16-1-1 specification. To learn more about our EMI testing equipment, please check out How We Test Power Supply Units.

The corresponding standards for minimizing EMI in IT products are CISPR 22 and its derivative EN 55022, which is for devices sold in the EU. There, every component featuring the "CE" marking has to comply with the EN 55022 standard. Both CISPR 22 and EN 55022 standards divide devices into two classes: A and B. B-class equipment is for domestic environments, so permitted EMI emissions are significantly lower than for A-class devices.

CISPR / EN55022 Limits

CISRP 22/ EN 55022 Class A Conducted EMI Limit
Frequency of Emission (MHz)Conducted Limit (dBuV)
Quasi-peakAverage
0.15 - 0.507966
0.50 - 30.07360
CISPR 22/ EN 55022 Class B Conducted EMI Limit
Frequency of Emission (MHz)Conducted Limit (dBuV)
Quasi-peakAverage
0.15 - 0.5066 - 5656 - 46
0.50 - 5.005646
5.00 - 30.006050

Conducted EMI Results

To conduct our EMC pre-compliance testing, we use the EMCView software kindly provided by TekBox Digital Solutions.

The conducted EMI transmissions are below the corresponding limits, so we can say that this PSU's EMI filter does a pretty good job.

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  • shrapnel_indie
    I know a guy that used to work for SLM at one time in his life. On one of the products for the company brands owned, he could mod it (it was a musical instrument amplifier) for just a couple of pennies and could have saved the company large sums of money on warranty work and improve reliability. He proposed the change, and it was denied because it broke the price-point, and warranties would cover any issues anyway.

    When bean-counters run the show, products will suffer, just so the price-point isn't exceeded and (now days particularly, immediate) profits are maximized. Makes me wonder if Silverstone listened to their bean-counters a little too much.
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  • Aris_Mp
    The thing I appreciate in SilverStone is that they didn't follow the marketing war in the warranty periods. For me it is really weird to see 10-12 years warranty in PSUs. Now with the mining craziness many companies are trying to find ways to get out of this.
    0
  • seanwilson5274
    why did an ad leading to this article popped up automatically on my windows 10 screen? I don't like being spammed, and even less so, when it comes in as sneaky as this.
    0
  • derekullo
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  • SilverStone Guy
    Anonymous said:
    When bean-counters run the show, products will suffer, just so the price-point isn't exceeded and (now days particularly, immediate) profits are maximized. Makes me wonder if Silverstone listened to their bean-counters a little too much.


    If bean-counters had their way, a PSU like this would have never been released in the first place! It's a very niche product that will not sell in significant quantities. Implementing sleeve bearing fan was not a cost-cutting move, it was out of necessity to keep the PSU noise low for the intended applications. At the time of development, FDB version of this fan was not yet available to us.
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