Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
At 09:53 AM 3/18/01 -0600, brian whatcott wrote:
A resistor is a resistor when it is hot.....
an oscilloscope shows the noise emf satisfactorily.
I wish I had an oscilloscope as nice as Brian's.
Let us assume
R = 1 meg
BW = 200 MHz
When I do the calculations, it seems
-- a cool (300K) resistor has 0.91 mV RMS thermal noise, while
-- a hot (400K) resistor has 1.05 mV RMS thermal noise.
It takes a verrry fine oscilloscope to see that ... rather better than your
garden-variety classroom scope.