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Please let have a look at the graph and let me know if they are fine
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Yeah, the soundcard cal is fine, but the measure has a small probem (that you can just forget about after I tell you what happened). See how the loopback measurement of the cable isn't perfectly flat? It should be.
That is showing you that you had the meter calibration file loaded (which you wouldn't do, since the cable isn't a meter and doesn't require a calibration file. The result of course is that the response is a mirror of the meter file....
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When I set the vertical scale of 0.1dB/division the graph is not symmetrical
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I don't know what you mean by that, but the graph scaling is set with the Graph Limits button in the top right hand corner of the REW screen. Use the standard of vertical scale of 45dB-105dB and horizontal scale of 15Hz -200Hz.
brucek