Com-Power CGO Series Gebruiksaanwijzing - Pagina 9
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Comb Generators model CGO‐520
Application
Radiated Emissions
EMI test sites such as Open Area Test Site (OATS) or Anechoic chambers are constructed with specific
requirements and are calibrated in a precise manner to optimize the reliability of the emissions measurements.
The time and expense incurred is considered essential to increase the repeatability of the data.
The data taken on the above sites are generally reliable. However, in some instances, discrepancies do occur, and
the reliability of data is questionable. Such discrepancies could be discovered when either (a) data from two sites
for the same equipment do not match, or (b) the data from two different occasions for the same equipment at the
same OATS are not consistent. It is important to find the cause for such inconsistency. This is generally a very time
consuming and difficult process because the reason could be one of four complex factors.
(1) Equipment under test (EUT),
(2) The Test Site
(3) Instrumentation
(4) Test personnel.
Each of these factors may have many possible causes. The EUT, for example, may have changed due to
component variation, temperature, operating mode, wear and tear, design etc. The test site may be a cause due to
a reflective object near the site, variation of ground saturation or ambient signal presence. It also could be due to
malfunctioning test instrumentation.
By establishing simple measurement procedure similar to the one described below the test lab can reduce
occurrence of these problems. There by increasing the reliability of measurements taken on the site. The
procedure described is just a guide and can varied according to your needs.
Measurement Procedure
As mentioned before, taking measurement more frequently is important. Create a log with frequency and levels
that you would like to record. This can be daily, weekly or monthly log. We recommend taking Comb Generator
measurement before to starting a radiated emissions test. Set up the Comb Generator with the appropriate
antenna (see frequency range on page 3). Put the Comb Generator where the equipment under test (EUT) is
normally placed during the test.
Make a measurement like you would on a EUT. We recommend using discrete frequency points rather than a wide
frequency sweep. Such as 30 MHz, 40 MHz, 100 Hz, 900 MHz, etc. Record the level for each frequency.
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Page 9 of 11
Rev. 0216