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Noise Source ENR Calibrate
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on Jun 14, 2010
on Jul 19, 2010 by tabbott
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With the buried Noise source, is it valid to adjust the ENR values such that the Cal result is 0 dB gain. Then the adjustment value is the loss between the Noise source and the SA input?
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Jul 19, 2010 8:06 AM
I’m not really sure what is meant by buried noise source in this inquiry, so let me explain a typical noise source cal process and hopefully this will help.
With the Agilent Technologies 346 series noise sources the ENR data has to be entered into an analyzer either manually or by using a floppy disk with the ENR data loaded. Once the ENR data is loaded into the analyzer all the instrument parameters must be set up such as start frequency, stop frequency, points, BW, etc.. The noise source is then connected directly to the input of the analyzer and a noise source cal if performed. After the calibration, the NF and Gain values should be zero based, but will not be exactly zero because the analyzer is expecting a DUT to be connected after the calibration. Generally the noise source is connected directly to the DUT input, but doesn’t have to be the case. If there is a pad or attenuator used between the noise source and the DUT that loss can be entered into the analyzer as Before DUT loss. The loss will be compensated for when the noise figure is measured. Adjusting the ENR values so the cal result is 0 dB is not something typically done.
If an Agilent Technologies N4000 series SNS is used, the ENR data is automatically downloaded from the noise source into the analyzer. The cal process is identical to what is stated above.
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