Performance Tests 2
E4416A/E4417A Power Meters Service Guide 21
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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