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Specifications and Supplemental Information
Sample Calculation of Measurement Accuracy
Sample Calculation of Measurement Accuracy
This section describes an example of calculating the measurement accuracy
for each measurement parameter, assuming the following measurement
conditions:
Measurement signal frequency
Measurement signal level
Measurement range
Measurement time mode
Ambient temperature
When measurement parameter is Cp-D (or Cs-D)
The following is an example of calculating the accuracy of Cp (or Cs) and D,
assuming that measured result of Cp (or Cs) is 8.00000 nF and measured result
of D is 0.01000.
From
0.055+0.030×K and the equation to calculate the accuracy of D is
0.00035+0.00030×K. The measurement signal level is 0.5, the measurement
range is 10 nF, and the measured result of Cp (or Cs) is 8.00000 nF. Therefore,
K=(1/0.5)×(10/8.00000) =2.5. Substitute this result into the equation. As a
result, the accuracy of Cp (or Cs) is 0.055+0.030×2.5=0.13% and the accuracy
of D is 0.00035+0.00030×2.5=0.0011.
Therefore, the true Cp (or Cs) value exists within 8.00000±(8.00000×0.13/100)=
8.00000±0.0104 nF, that is, 7.9896 nF to 8.0104 nF, and the true D value exists
within 0.01000±0.0011, that is, 0.0089 to 0.0111.
When measurement parameter is Cp-Q (or Cs-Q)
The following is an example of calculating the accuracy of Cp (or Cs) and Q,
assuming that measured result of Cp (or Cs) is 8.00000 nF and measured result
of Q is 20.0.
The accuracy of Cp (or Cs) is the same as that in the example of Cp-D.
From
0.00035+0.00030×K. Substitute K=2.5 (same as Cp-D) into this equation. The
accuracy of D is 0.00035+0.00030×2.5=0.0011. Then, substitute the obtained
D accuracy into the equation specified in
±(20.0)
Therefore, the true Q value exists within the range of 19.57
202
Table
10-10, the equation to calculate the accuracy of Cp (or Cs) is
Table
10-11, the equation to calculate the accuracy of D is
2
+ −
×0.0011/(
1
20.0
×0.0011) =±0.44/(
Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter
1 kHz
0.5 V
10 nF
N = 1
28 °
C
Table
10-6. The accuracy of Q is
+ −
1
0.022
), that is, -0.43 to 0.45.
20.45.
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