Multifunction DAQ

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can't match error calc. of rms noise error in NI meas. encyc.

I get the 1 sigma STD based on Lafrance, "Fund Concepts in
Comm. as sigma/ = [{2N (0.5kT)^2}^1/2]/0.5NkT where N = 2BW or = 1/(BW)^0.5 and whereas the meas. encycl. result is 1/[2(BW)^0.5] for a 2 sigma error. Can you help? wouldn't I need 4 1 sec meas.(ex.) for .95 confidence. Also what is the best way to do rms white noise meas. using LV? Thanks. Regards, Jerry
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