Hello,

I am trying to calculate the uncertainties involved with a N1912A power meter with a N1922A power sensor. I'm looking at the N1912A datasheet and i've been trying to figure out the worked example for the uncertainty analysis and I have some questions.

1. In Step 8 to calculate the combined k=1 uncertainties, I cannot compute 2.23%. I get 2.04% Why?

2. For determining standard uncertainty of mismatches, I believe it should be sqrt(2)*|Gamma1|*|Gamma2|. The datasheet example uses |Gamma1|*|Gamma2|/sqrt(2). Although, even if I change to the one I think is correct, i still get 2.041%, not 2.23% as shown.

Is there an error in the worked example?

Thank you in advance!

I am trying to calculate the uncertainties involved with a N1912A power meter with a N1922A power sensor. I'm looking at the N1912A datasheet and i've been trying to figure out the worked example for the uncertainty analysis and I have some questions.

1. In Step 8 to calculate the combined k=1 uncertainties, I cannot compute 2.23%. I get 2.04% Why?

2. For determining standard uncertainty of mismatches, I believe it should be sqrt(2)*|Gamma1|*|Gamma2|. The datasheet example uses |Gamma1|*|Gamma2|/sqrt(2). Although, even if I change to the one I think is correct, i still get 2.041%, not 2.23% as shown.

Is there an error in the worked example?

Thank you in advance!