Figure 29 ~ 32 on datasheet of ADuCM350,
Impedance magnitude of accuracy is about 191.23ohm, but magnitude of precision is about 183.3ohm.
Why the difference occurs?
There is an error in Figure 31 and Figure 32. For both figures, the Z value is incorrect. It should read:
Z = 140Ω + 68nF
Also, the Y-axis label should read:
Number of Measurements
The same corrections apply to both Figure 31 and Figure 32. It should also be noted that the capacitors used for these measurements (including the accuracy measurements in Figures 29 and 30) were COG capacitors with 1% tolerance. This tolerance may cause a slight deviation from the ideal value.
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