Com-Power CGO-501 Руководство по эксплуатации - Страница 10
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CGO-501, CGO-505 and CGO-515 Comb Generators
Page 10 of 14
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 a simple measurement procedure similar to the one described below, the test lab can reduce the
occurrences of such problems; thereby 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 measurements frequently is important. Create a log with frequency and levels that
you would like to record. This can be a daily, weekly or monthly log. We recommend taking Comb Generator
measurements before 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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