加载中…电磁兼容性的现场/外场测试 On-Site(In-situ) EMC Test Methods
(2011-11-29 12:30:40)
标签：
现场测试on-sitein-situ杂谈 |
分类： 电磁兼容EMC |
注：
所谓现场测试（也称为外场测试），就是将EMC测试仪器搬运到产品工作的现场进行的测试。
如风力发电机，因该类产品体积庞大，且需要风力才能正常工作，EMC测试就必须在风力发电机安装的现场进行。
|
No. |
Test Item |
Test Requirements |
|
1. |
Conducted Emission EN 61000-6-4 CISPR 16-1-1 as reference) |
The EUT should be tested with the whole appliance active, including all modules, full load or at least appropriate load. Output lines( L1/L2/L3/N ), net cable, as well as power lines which can be connected to public power supply should be tested respectively. |
|
2. |
Radiated Emission EN 61000-6-4 CISPR 16-1-1 as reference) |
The EUT should be tested with the whole appliance active, including all modules, full load or at least appropriate load. Four surfaces (Front/Rear/Left/Right) should be checked respectively. |
|
3. |
ESD immunity EN 61000-6-2 EN 61000-4-2 as reference) |
The whole EUT should be active with appropriate load (such as 10% full load). Test Level: Conduct discharge: +/-4.0kV Air discharge: +/-2.0kV |
|
4. |
RF Electromagnetic Field Immunity EN 61000-6-2 EN 61000-4-3 as reference) |
The whole EUT should be active with appropriate load (such as 10% full load). Four surfaces (Front/Rear/Left/Right) should be checked respectively. Level: 10V/m |
|
5. |
EFT immunity EN 61000-6-2 EN 61000-4-4 as reference) |
The whole EUT should be active with appropriate load (such as 10% full load). Power supply, DC lines (>3m), net-cable (>3m) should be checked. Test Level: for input or output AC/DC lines: +/-2.0kV; other lines (Signal/net cable(>3m)): +/-1.0kV |
|
6. |
Surge Immunity EN 61000-6-2 EN 61000-4-5 as reference) |
The whole EUT should be active with appropriate load (such as 10% full load). Test Level: L/N-PE: +/-0.5kV, +/-1.0kV, +/-2.0kV L-N: +/-0.5kV, +/-1.0kV Note: The test level should be performed from low to high |
|
7. |
Inject Currents Immunity, 0.15MHz to 80MHz EN 61000-6-2 (EN 61000-4-6 as reference) |
The whole EUT should be active with appropriate load (such as 10% full load). Power supply, DC lines(>3m), net-cable(>3m) should be checked. Level: 10V/m |
|
8. |
Voltage Dips and Interruption Immunity EN 61000-6-2 (EN 61000-4-11 as reference) |
The whole EUT should be active with appropriate load (such as 10% full load). |
For conducted emission and radiated emission test, the ambient noise level should be at least 20 dB below the specified limit. For in-situ tests the ambient noise level should be at least 6 dB below the specified limit. In in-situ cases, the emission plus ambient must not exceed the limit. If the emission plus ambient exceeds the limit, then other methods need to be applied, for example, reduce the bandwidth, apply ambient cancellation, change frequency etc. The suitability of the site for the permitted ambient level may be determined by measuring the ambient noise level with the EUT in place but not operating.
Reference ground is very important for EMC test. The existing ground at the place of installation should be used as reference ground. This should be selected by taking high-frequency (RF) criteria into consideration. Generally, this is accomplished by connecting the EUT via wide straps, with a length-to-width ratio not exceeding 3, to structural conductive parts of buildings that are connected to earth ground. These include metallic water pipes, central heating pipes, lightning wires to earth ground, concrete reinforcing steel and steel beams.
1 Conducted Emission
For conducted emission test, AMN is used as a voltage probe because practical current limitations are exceeded. The principle of test setup is as follows:
http://s12/middle/4bfb10e4gb2d909d4a71b&690On-Site(In-situ)
NOTE: Exposed
pins are made safe.
2 Radiated Emission
OATS is used as test site. Test setup is as follows:
http://s9/middle/4bfb10e4gb2d912ade458&690On-Site(In-situ)
根据同背景噪声比较，剔除背景噪声部分，采用分频段测量方法（Basing on the comparing with Background curve,
eliminate the part of background and use the measurement method of
discontinued range of frequency）
略。。。
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