Hi all
Thanks for the replies,
The filter is a ETS Lindgren Filter N6003 installed on the EMC Chamber wall.
The filter is defined as a 4 line 230/400V 32A <450Hz filter.
When used for DEF STAN EMC measurements and loaded by the 4 of 10uF prior to
the 5uH LISNs it appears to be OK,
however when only 1 phase is used it seems to cause an imbalance.
The ambient measurement shows the 400Hz and harmonics. Other than the region
6kHz to 50kHz which exceeds the specified limit the rest of the frequency range
is flat and meets the 6dB below the specified limit criteria.
The use of 10uF on each supply lead on the load side of the LISN's improves the
response of the 6kHz to 50kHz region but this is still within 6dB of the
specified limit.
Is there anything that can be done to improve the chamber filter performance?
The original 155V 400Hz generator never caused any issues, when it was replaced
had an issue with the filter being noisy.
Chamber was replaced when EMC facility moved to a new building.
Originally 115V 400Hz to be taken from building supply but LISN's kept tripping
supply.
Now supply obtained from a Failsafe SFC 6010 Static Convertor.
Regards
Andy
Andrew Price
Integrated Sensing & Protection (ISP)
Prinicpal Environmental Engineer (EMC)
Leonardo UK
Sigma House,
Christopher Martin Rd,
Basildon
SS14 3EL, UK
Tel EMC LAB : +44 (0)1268 883308
Mobile: +44 (0)7507 854888
[email protected]<mailto:[email protected]>
leonardocomapany.com
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