In the measured mathematical model, M is the noise limit sensitivity of the image channel; U is the display value displayed by the multi-channel converter; Te, Ec, Mu, If, and Os are the correction coefficients with the expected value of 1.
Analyze and quantify the uncertainty component test signal generator u (te). The calibration result from the instrument verification certificate is 700μV ± 50μV (maximum allowable error); therefore it will produce an uncertainty of signal strength = 0.61dB.
It follows a uniform distribution with a degree of freedom of ∞.
The calibration result from the instrument verification certificate is 300μV ± 9μV (maximum allowable error); this error will produce an uncertainty of signal strength = 0.26dB.
It follows a uniform distribution with a large degree of freedom ∞.
The multi-channel converter u (mu) is 1800μV ± 78μV (the maximum allowable error) from the instrument verification certificate; this error will produce an uncertainty of signal strength = 0.37dB.
Its probability distribution follows a uniform distribution with a degree of freedom of ∞.
The TV intermediate frequency modulator u (if) is obtained from the instrument verification certificate. The instrument's indication error is very small; the uncertainty generated by this instrument is very small compared to the uncertainty caused by other factors, so it can be ignored.
The uncertainty caused by the oscilloscope adopts Class A evaluation, that is, the amplitude of the signal is measured independently 10 times (the standard amplitude of the signal is 60mV) in a short time by the oscilloscope. It includes the oscilloscope probe (100: 1) generated by the input signal. Uncertainty, the degree of freedom is ν = 9.
Uncertainty caused by imperfect test environment This test requires that it be conducted in a shielded room. Therefore, the shielded room must have a certain ability to shield the interference signals of electromagnetic fields in the external environment, and the uncertainty generated by it can be ignored.
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