The　measurement　error　of　core　loss　by　general　AC　meter　method　is　very　large,　especially　when　the　impedance　angle　of　the　core　is　closed　to　90°.　The　DC　meter　method　was　adopted　in　this　paper.　The　basic　idea　is　to　transform　the　input　DC　voltage　into　a　PWM　voltage　exciting　on　the　magnetic　core　by　a　DC/AC　circuit,　and　the　core　loss　is　obtained　by　measuring　the　active　power　from　input　DC　voltage.　This　DC　meter　method　can　avoid　the　influence　of　impedance　angle　of　the　DUT.　However,　with　this　DC　method,　any　other　losses　excepting　for　core　loss　shall　be　excluded　someway.　Accepting　for　the　solution　to　minimize　the　losses　in　DC/AC　circuit　itself,　a　calibration　method　with　air-core　inductor　was　proposed　to　effectively　take　off　the　losses　in　DC/AC　circuit　by　mathematical　formula　of　the　curve　fitting.　The　calibration　method　made　the　accuracy　further　improved.　The　verification　test　is　build　to　validate　that　the　DC　meter　method　with　the　calibration　mathematical　formula　of　the　losses　except　core　loss　is　accurate　enough　for　practical　applications,　even　for　the　powder　cores.　©　2012　IEEE.