Comtrend PG902 Test Results

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The Test Results from a Notified Body: Comtrend PG902

This test was conducted by Hursley EMC who are a Notified Body with international Accreditation, including Military. The test results from an organisation such as this are indisputable. Let's take a look at the results and see what they have to say.

EMC Test Rig


Test Number     :06
Customer       :JOHN RALLEY

Details of Equipment under test

  SYSTEM UNIT  :   200Mbps Powerline Adapter

                   P/N: 301104-092

  Mfg          :   Comtrend

  S/N          :   08011006455A

  VOLTAGE, FREQ:   230v 50Hz NEUTRAL

  TEST BY      :   M.T


Test Limit                     :CISPR "B" AvTest
Test Loaded                    :2008/12/04 at 16:16
Completion                     :100% 2008/12/04 at 16:36
Report printed at              :2008/12/04 at 16:36
Software level                 :1075262254
Test specification file        :CONDUCTED EMISSIONS9_45.DCF
Test Sequence file             :CONFIGS\CON_COM.DCF
Spectrum Analyser definition   :INSTRUMENTS\SPECANL\HP8568B_8.DCF
Transducer Correction          :FACTORS\CONDUCTEDD.DCF
Source table file(s)           : C:\PROFILA\FACTORS\CEFAC.TXT C:\PROFILA\FACTORS\COND CABLE FACTOR.TXT
Test Receiver definition       :INSTRUMENTS\RX\ESH3_4.DCF
Transducer Correction          :FACTORS\CONDUCTEDD.DCF
Source table file(s)           : C:\PROFILA\FACTORS\CEFAC.TXT C:\PROFILA\FACTORS\COND CABLE FACTOR.TXT
Plot is filed as C:\PROFILA\RESULTS\JOHN RALLEY\08CE0526_06.WMF

SIGNIFICANT PEAKS

 Frequency    Absolute   Amplitude  Test limit    Detector

              Amplitude relative to limit

 779.950 kHz    41.27dB   -14.73dB  CISPR "B" QP  Quasi Peak

 779.950 kHz    28.77dB   -17.23dB  CISPR "B" Av  Average

 1.36940 MHz    39.64dB   -16.36dB  CISPR "B" QP  Quasi Peak

 1.36940 MHz    27.34dB   -18.66dB  CISPR "B" Av  Average

 2.65710 MHz    90.52dB    34.52dB  CISPR "B" QP  Quasi Peak

 2.65710 MHz    75.42dB    29.42dB  CISPR "B" Av  Average

 5.92820 MHz    89.95dB    29.95dB  CISPR "B" QP  Quasi Peak

 5.92820 MHz    75.25dB    25.25dB  CISPR "B" Av  Average

 8.03570 MHz    88.84dB    28.84dB  CISPR "B" QP  Quasi Peak

 8.03570 MHz    68.04dB    18.04dB  CISPR "B" Av  Average

 12.2312 MHz    89.95dB    29.95dB  CISPR "B" QP  Quasi Peak

 12.2312 MHz    70.25dB    20.25dB  CISPR "B" Av  Average

 17.2732 MHz    88.35dB    28.35dB  CISPR "B" QP  Quasi Peak

 17.2732 MHz    67.25dB    17.25dB  CISPR "B" Av  Average

 23.1193 MHz    89.93dB    29.93dB  CISPR "B" QP  Quasi Peak

 23.1193 MHz    69.53dB    19.53dB  CISPR "B" Av  Average

 27.5088 MHz    87.98dB    27.98dB  CISPR "B" QP  Quasi Peak

 27.5088 MHz    69.08dB    19.08dB  CISPR "B" Av  Average

Comtrend CISPR 1

Would someone care to tell us how this conforms to 2004/108/EC or EN55022?

If you noticed above, we have highlighted the measurement which was highest in the group at 34.52dB. On the Advent PLT ADE-200KIT page, we stated that a single PLT device can emit interference at the level of 1,000 barely legal units. We would like to point out that 34.52dB is equivalent of 2,830 barely legal devices!

Well we suppose since Ofcom state: "there is no significant harm arising" that makes a device which fails the internationally agreed legal limits for conducted emissions perfectly OK.

Oh but hang on, this could be a 'faulty' unit not representative of the product line. So here are the results for another unit:


Test Number    :07
Customer       :JOHN RALLEY

Details of Equipment under test

  SYSTEM UNIT  :   200Mbps Powerline Adapter

                   P/N: 301104-092

  Mfg          :   Comtrend

  S/N          :   08011006455B

  VOLTAGE, FREQ:   230v 50Hz LINE

  TEST BY      :   M.T



Test Limit                     :CISPR "B" Av
Test Loaded                    :2008/12/04 at 16:16
Completion                     :100% 2008/12/04 at 16:47
Report printed at              :2008/12/04 at 16:47
Software level                 :1075262254
Test specification file        :CONDUCTED EMISSIONS9_45.DCF
Test Sequence file             :CONFIGS\CON_COM.DCF
Spectrum Analyser definition   :INSTRUMENTS\SPECANL\HP8568B_8.DCF
Transducer Correction          :FACTORS\CONDUCTEDD.DCF
Source table file(s)           : C:\PROFILA\FACTORS\CEFAC.TXT C:\PROFILA\FACTORS\COND CABLE FACTOR.TXT
Test Receiver definition       :INSTRUMENTS\RX\ESH3_4.DCF
Transducer Correction          :FACTORS\CONDUCTEDD.DCF
Source table file(s)           : C:\PROFILA\FACTORS\CEFAC.TXT C:\PROFILA\FACTORS\COND CABLE FACTOR.TXT
Plot is filed as C:\PROFILA\RESULTS\JOHN RALLEY\08CE0526_08.WMF

SIGNIFICANT PEAKS

 Frequency    Absolute   Amplitude  Test limit    Detector

              Amplitude relative to limit

 468.500 kHz    45.62dB   -10.92dB  CISPR "B" QP   Quasi Peak

 468.500 kHz    35.62dB   -10.92dB  CISPR "B" Av  Average

 3.01290 MHz    91.94dB    35.94dB  CISPR "B" QP  Quasi Peak

 3.01290 MHz    75.04dB    29.04dB  CISPR "B" Av  Average

 5.62430 MHz    90.63dB    30.63dB  CISPR "B" QP  Quasi Peak

 5.62430 MHz    74.33dB    24.33dB  CISPR "B" Av  Average

 8.92120 MHz    88.17dB    28.17dB  CISPR "B" QP  Quasi Peak

 8.92120 MHz    72.37dB    22.37dB  CISPR "B" Av  Average

 12.2271 MHz    91.65dB    31.65dB  CISPR "B" QP  Quasi Peak

 12.2271 MHz    76.05dB    26.05dB  CISPR "B" Av  Average

 16.0399 MHz    89.83dB    29.83dB  CISPR "B" QP  Quasi Peak

 16.0399 MHz    63.23dB    13.23dB  CISPR "B" Av  Average

 17.7996 MHz    84.86dB    24.86dB  CISPR "B" QP  Quasi Peak

 17.7996 MHz    61.26dB    11.26dB  CISPR "B" Av  Average

 24.5304 MHz    90.25dB    30.25dB  CISPR "B" QP  Quasi Peak

 24.5304 MHz    70.95dB    20.95dB  CISPR "B" Av  Average

Comtrend CISPR 2

Look at 3 MHz. 35.94dB above the specified limit. That is equivalent of 3,930 barely legal devices.

But since Ofcom state they are legal, Ofcom MUST be correct, non? Well, er, no. Here we have definitive proof from an Internationally Accredited laboratory which clearly demonstrates that the devices tested do not conform to the internationally agreed legal limits.

Finally we provide Comtrend unit "B's" final results:


Test Number    :09
Customer       :JOHN RALLEY

Details of Equipment under test

  SYSTEM UNIT  :   200Mbps Powerline Adapter

                   P/N: 301104-092

  Mfg          :   Comtrend

  S/N          :   08011006455B

  VOLTAGE, FREQ:   230v 50Hz NEUTRAL

  TEST BY      :   M.T



Test Limit                     :CISPR "B" Av
Test Loaded                    :2008/12/04 at 16:16
Completion                     :100% 2008/12/04 at 16:54
Report printed at              :2008/12/04 at 16:54
Software level                 :1075262254
Test specification file        :CONDUCTED EMISSIONS9_45.DCF
Test Sequence file             :CONFIGS\CON_COM.DCF
Spectrum Analyser definition   :INSTRUMENTS\SPECANL\HP8568B_8.DCF
Transducer Correction          :FACTORS\CONDUCTEDD.DCF
Source table file(s)           : C:\PROFILA\FACTORS\CEFAC.TXT C:\PROFILA\FACTORS\COND CABLE FACTOR.TXT
Test Receiver definition       :INSTRUMENTS\RX\ESH3_4.DCF
Transducer Correction          :FACTORS\CONDUCTEDD.DCF
Source table file(s)           : C:\PROFILA\FACTORS\CEFAC.TXT C:\PROFILA\FACTORS\COND CABLE FACTOR.TXT
Plot is filed as C:\PROFILA\RESULTS\JOHN RALLEY\08CE0526_09.WMF

SIGNIFICANT PEAKS

 Frequency    Absolute   Amplitude  Test limit    Detector

              Amplitude relative to limit

 2.83200 MHz    92.13dB    36.13dB  CISPR "B" QP  Quasi Peak

 2.83200 MHz    77.03dB    31.03dB  CISPR "B" Av  Average

 5.51085 MHz    90.33dB    30.33dB  CISPR "B" QP  Quasi Peak

 5.51085 MHz    74.63dB    24.63dB  CISPR "B" Av  Average

 8.66075 MHz    87.56dB    27.56dB  CISPR "B" QP  Quasi Peak

 8.66075 MHz    67.66dB    17.66dB  CISPR "B" Av  Average

 12.3164 MHz    88.06dB    28.06dB  CISPR "B" QP  Quasi Peak

 12.3164 MHz    68.86dB    18.86dB  CISPR "B" Av  Average

 17.2730 MHz    89.85dB    29.85dB  CISPR "B" QP  Quasi Peak

 17.2730 MHz    69.55dB    19.55dB  CISPR "B" Av  Average

 19.7734 MHz    88.79dB    28.79dB  CISPR "B" QP  Quasi Peak

 19.7734 MHz    68.79dB    18.79dB  CISPR "B" Av  Average

 22.8161 MHz    91.63dB    31.63dB  CISPR "B" QP  Quasi Peak

 22.8161 MHz    71.83dB    21.83dB  CISPR "B" Av  Average

 25.6250 MHz    90.56dB    30.56dB  CISPR "B" QP  Quasi Peak

 25.6250 MHz    68.66dB    18.66dB  CISPR "B" Av  Average

Comtrend CISPR 3

In this final test, the first result in the series is a record breaker. At 36.13dB above the internationally agreed limits for Conducted Emissions, this represents a staggering 4,100 times the interference of a barely legal unit.

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Page updated: 8th December 2020

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