10-7
Determining System Measurement Uncertainties
Determining Cable Stability Terms (C
R1
, C
R2
, C
TM1
, C
TM2
, C
TP1
, C
TP2
)
Figure 10-2 Cable Stability with a Short Connected
Figure 10-2 and Figure 10-3 demonstrate the concepts useful in determining cable
transmission stability. A short is connected to the free end. The DATA/MEM feature
provides an indication of the two-way cable transmission stability. The one-way
transmission magnitude stability is determined by dividing the two-way magnitude
measurement by two before it is converted to linear. A 0.013-dB peak on the chart yields
transmission magnitude stability estimated as 10
(0.013/40)
−1 or 0.00075. The one-way
transmission phase stability is determined by dividing the two-way phase measurement
by two.
Figure 10-3 Cable Stability with a Short Connected
Cable movement often has a much larger effect on phase measurements than magnitude
measurements.
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