Increasing the telecommunications products that allow Vector Network Analyzer is becoming more common tools to measure the S-Parameter. It will be an absolute number from the S-Parameter measurements produced in real and imaginary, other words it is also known as the product of the calculation. The calculation findings do not include the systematic and random errors. It's the reaction of the engineer to mitigate the likelihood of random and systemic errors. One of the common random error solutions is through the statistical analysis in the Vector Network Analyzer either repeated measurement or turn on high averaging measurement. The more data assessed, the greater the engineer's confidence in evaluating random errors did not contribute significant errors. Systemic Error is consistent and reproducible when the measurement is made. One way of harmonizing these errors is to evaluate uncertainty measurements in the calculation for Vector Network Analyzer to perform measurements of reflection and transmission. Transmission measurements produce the three systematic errors that were directivity, source match and frequency response reflection tracking. This paper will concentrate from 300 kHz to 8.5 GHz directivity experimental to determine the accuracy of the Vector Network Analyzer. The experimental results will check balance with the Vector Network Analyzer specification. It is a validation process to ensure the Vector Network Analyzer meets the specification in order to perform an accurate measurement. The estimation of measurement uncertainty also refers to the Metrology 100 series Joint Committee for Guide to the Expression of Uncertainty in Measurement. The uncertainty expended should apply to Student Table's confident level of 95%. It creates awareness to demonstrate the importance of measurement quality associated with the uncertainty, particularly for an ISO17025:2017 certified competence testing and calibration laboratory. Without the uncertainty associate to the measurement, it is not complying to the standard ISO17025:2017.

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Network Analyzer is equipment widely used for the execution of radio frequency application scattering parameters. Throughout absolute reading the scattering parameter measured. An absolute reading does not include error, drift, offset, linearity, resolution, coefficient of sensitivity and several other variables that will contribute to the measured measurement dispersion. Type A evaluations of measurement uncertainty clarified according to ISO / IEC Guide 98-1. Type A uncertainty assumption is always done best to characterize an input quantity given in repeated indication values. The assumption was calculated from arithmetic mean, variance of probability distribution and standard deviation respected to the frequency from 300 kHz to 8.5 GHz in a Network Analyzer measurements. Furthermore, ISO/IEC 17025 is the standard for accredited testing and calibration laboratory to calculate the uncertainty of measurement to be declared in the scope of accreditation. Type A uncertainty calculation is one of the mandatory requirements for an accredited testing and calibration laboratory. The Type A uncertainty will be combined with Type B uncertainty to calculate the expanded uncertainty in measurement.

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