Tests for a product powered through the signal cable.
Dear all:
Can anyone kindly let me know how to decide what tests should be performed
for a DC module/product powered by USB port or PS2 port per EMC directive.
My thoughts are listed below:
EN55022 (Conducted Emission--yes; Radiated Emission--yes)
EN 55024
Table 1 -->IEC 61000-4-6--yes, IEC 61000-4-3--yes, IEC 61000-4-2--yes
Table 2 (only for apply to the cable)-->IEC 61000-4-6--yes, IEC61000-4-5--yes,
IEC 61000-4-4--yes
Table 3-no
Table4-no
I am not sure whether my decesions are right or wrong.
Thanks for your responses in advance!!
Yu-Lung Chen
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The test modes for Monitor
Dear all:
For a monitor, there are many displaying modes. The related factors are
resolutions (640x350, 640x400, 720x400, 640x480, 800x600, 1024x768, 1152x864,
1280x960,..), refresh rate(56Hz, 60Hz, 72Hz, 75Hz, 85Hz).
If a monitor has most of the displaying modes, how can I find the worst case
while performing the EMI measurement ( both radiated & conducted emission test)
in the shortest period of time during preliminary test stage. Is it like what
mentioned in ANSI C63.4 about the radiated emission for intentional radiator
above 1GHz to measure lowest , middle, and highest frequency? What I mean is
that can I reduce the procedure in finding the worst case to maybe some typical
representive modes( Maybe selecting the resolution to be lowest, middle, and
highest separately, and then different refresh rate, etc).
Can anyone tell me about how to find the worst case for a monitor with various
displaying modes during EMI tests?
Thanks!!!
Yu-Lung Chen
Leader of Quality Management Division & Standard Research Division
Tatung EMC Technology Co.
No. 11, Lane 41, Fushuen St., Jungshan Chiu, Taipei, Taiwan 104
Tel: 886-2-25984568 ext 111
Fax: 886-2-25984546
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How to meassure/define the radiated disturbances of Microwave-Oven?
Dear all: Can anyone tell me about how to meassure/define the radiated disturbances of Microwave-Oven according to CISPR 11 and 19? In CISPR19: 1983, the substitution method was introduced to measure the effective radiated power per limit for radiated power 57dB(pW) from CISPR 11: 1990 in frequency range 1GHz to 18GHz. But the required radiated disturbances limit for 1GHz to 18GHz in CISPR 11:1997+A!1999 was clearly defined as the electric field strength 70~110 dB(uV/m) mentioned in table 6, 7 of which. The measurement procedures for this two different required limits and units are also different. It is well known that the sustitution method was a complicated procedures, it should use the signal generator and the transmitting horn antenna to replace the Microwave Oven to measure the ERP of which. According to the required limits for field strength given in the 1999 version of CISPR 11, I think that the test time for the Microwave Oven is reduced because the measurement is just for the radiated field strength from the Microwave Oven. It is similiar to tests for ITE, righ? I think that the substitution method for ERP in the frequency range above 1GHz is replaced by directly measuring the radiated disturbances of Microwave Oven for field strength in frequency range clearly defined (1GHz~18GHz). I am not sure that what my thought is right or not because some countries in the world still use the CISPR 11:1990 as their criteria for the Microwave Oven in marketing. Your comments are great helpful for our testing service for our customers. Thanks a lot! Best Regards!!! Yu-Lung Chen Tattung EMC Technology Co. No.11, Lane41, Fushuen St., Jungshan Chiu, Taipei, Taiwan 104, R.O.C. Tel:886-2-25984568 Ext. 111 886-2-25984569 Ext. 111 Fax:886-2-25984546 email address: c...@emc.tatung.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
