Performance Tests 2
Keysight E4416A/E4417A Power Meters Service Guide 31
Instrument Accuracy (Normal Path) Test
Specification
Description
This test verifies the accuracy of the normal path in the power meter by
calculating linear error over 50 samples. The standard deviation is then calculated
using the non-biased or n-1 method:
Equation 2-1: Standard Deviation
The test result is obtained by applying a factor of K = 2.58:
Equation 2-2: Accuracy
This accuracy figure represents electrical performance of the normal path with
confidence limits of 99%.
Electrical Characteristics Performance Limits (maximum)
Accuracy 0.8% or 0.04 dB
σ
nΣx
2
Σx()
2
–
nn 1–()
--------------------------
=
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