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Power Sensor Uncertainty for Relative Measurements

Question asked by Andrew004 on Sep 28, 2016
Latest reply on Jan 5, 2017 by Andrew004
  • Comment • 2

Hi Keysight,

 

Our group is doing a lot of uncertainty analysis on our measurements lately and I have a question that I wasn't able to find an answer to. We have tests to verify step attenuation levels in our test fixture. If we're taking differences between an initial reference measurement and the different levels of attenuation, how does this alter the uncertainty that would typically be seen in the GUM style uncertainty budgets for power measurements? Would mismatch, instrument, linearity, etc. be included using their typical values?

kaicheah
kaicheah Employee Nov 30, 2016 4:25 PM
Correct Answer

Hi,

 

In relative power measurement, the following uncertainty parameters will cancel out:

  1. Mismatch terms.
  2. Cal factor uncertainty.
  3. Instrumentation.

 

And the following parameters will remain:

  1. Linearity.
  2. Zeroset.
  3. Noise.
  4. drift.
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