Keysight NFA Series Performance Verification And Calibration Manual page 88

Test Descriptions
Gain Measurement Uncertainty
Step 7. Convert the delta ratios to dB error values using 10*LOG
reading from index 1 to 71). Enter the value in the Worksheet No. 1.
Example: Index 16 = 1.004545 = 10 * LOG
Step 8. Using the error data calculated in the Worksheet No. 1, enter the
peak-to-peak error in dB over the 30 available measurement ranges in
the Worksheet 2.
Step 9. Record the worst Instrumentation Uncertainty into the Test Record and
ensure that the measured value is within its published specification.
68
(Delta
10
(1.004545) = 0.019694dB
10
Chapter 2