For reflection measurements, the uncertainty in magnitude VRC, U(|*|) can be converted to the equivalent return loss uncertainty, U(RL), using Eq. 3^{8}:

where:

* = the measured VRC.

Calculating phase uncertainty:

For a given S-parameter, Sij (i = 1, 2; j = 1, 2), the uncertainty in phase, U(*), can be estimated using Eq. 4^{9}:

where:

U(|Sij|) = the uncertainty in |Sij|.

When calculating the uncertainty in transmission phase, it is first necessary to determine the uncertainty in the magnitude of the linear transmission coefficient (i.e. U(|S21|) or U(|S12|)). This can be derived from the measured attenuation, A, and the uncertainty in the measured attenuation, U(A), using Eq. 5^{8}:

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