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VMC Cal input power offset
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on Oct 13, 2010
on Oct 14, 2010 by Dr_joel
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I ran a VMC cal and set the input power to -10 dBm. When I setup a VC21 measurement, I saw that I had -11.55 dBm at the end of the cable instead of -10 dBm. Isn't the VMC calibration supposed to take care of that loss? Thanks...
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Oct 14, 2010 7:21 AM
No, VMC takes care of the ratio measurements (b/r) so that the gain is corrected, but not the source power. You can also correct the source power by doing a source power cal separately. Notice that when you do a VMC cal you don't use a power meter.
SMC uses a power meter as a reference, and corrects for input and output loss and corrects source power at the same time. SMC gives the best results for amplitude response, VMC is needed to get phase response, but has more uncertainty in the amplitude response.
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