Keysight E4981A - When Measurement Parameter Is Cp-G; When Measurement Parameter Is Cp-Rp

Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter 203
Specifications and Supplemental Information
Sample Calculation of Measurement Accuracy
When measurement parameter is Cp-G
The following is an example of calculating the accuracy of Cp and G, assuming
that measured result of Cp is 8.00000 nF and measured result of G is
1.00000 µS.
The accuracy of Cp is the same as that in the example of Cp-D.
From Table 10-6, the equation to calculate the accuracy of G is
(3.5+2.0×K)×Cx. Substitute K=2.5 (same as Cp-D) and 8.00000 nF of the
measured Cp result into this equation. The accuracy of G is
(3.5+2.0×2.5)×8.00000=68 nS(0.068 µS).
Therefore, the true G value exists within 1.00000±0.068 µS, that is, 0.932 µS
to
1.068 µS.
When measurement parameter is Cp-Rp
The following is an example of calculating the accuracy of Cp and Rp,
assuming that measured result of Cp is 8.00000 nF and measured result of Rp
is 2.00000 MΩ.
The accuracy of Cp is the same as that in the example of Cp-D.
From Table 10-6, the equation to calculate the accuracy of G is
(3.5+2.0×K)×Cx. Substitute K=2.5 (same as Cp-D) and 8.00000 nF of the
measured Cp result into this equation. The accuracy of G is
(3.5+2.0×2.5)×8.00000=68 nS. Then, substitute the obtained G accuracy into
the equation specified in Table 10-6. The accuracy of Rp is
±(2×10
6
)
2
×68×10
-9
/( ×68×10
-9
) =±0.272×10
6
/( ), that is,
-0.23944 MΩ to 0.31481 MΩ.
Therefore, the true Rp value exists within 1.76056 MΩ to 2.31481 MΩ.
1210
6
×
+
−
10.136
+
−