Empower Tip: Empower User Question

In this tip, we will answer another question from an Empower user regarding the calculation of USP signal-to-noise ratio.

QUESTION:

Why am I not getting the USP signal-to-noise calculated when I use a blank for the noise calculation?

Please Note: For this tip, I am using generic data as the customers’ data is confidential.

The result displayed does not have the USP signal-to-noise (s/n) nor the USP Noise calculated.

The ‘Suitability’ tab in the Processing Method shows the correct selection for calculating USP signal-to-noise (s/n) and the use of a blank injection to calculate noise.

Working backward, ‘Alter Sample Set’ displays the ‘Sample Matrix’ field. The selection for the ‘Blank’ is different from the rest of the samples and that is the problem.

Modify the ‘Sample Matrix’ to be the same for the blank.

Reprocess the Sample Set and now the result for the same sample shows the values are calculated.

Search on ‘Verifying System Performance’ in the online help and you will see a Tip regarding the Sample Matrix.

It’s that easy!