Keysight E4981A - Page 174

174 Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter
Specifications and Supplemental Information
Basic Specifications
10-
Accuracy of Cp, Cs, D, G, Rs, Q and Rp
Table 10-8 to Table 10-13 show the measurement accuracy of Cp, Cs, and D
when D ~ 0.1.
Table 10-6 shows the formula of the measurement accuracy of G, Rs, Q and Rp
when D ~ 0.1.
When 0.1
| D ~ 0.5, multiply the accuracy obtained from Table 10-8 to Table
10-6 by the coefficient in Table 10-5.
C
e
: Cp or Cs Accuracy [%]
f: Measurement frequency [Hz]
C
x
: Measurement value of Cp or Cs [F]
Q
x
: Measurement value of Q
Rp
x
: Measurement value of Rp [Ω]
De: D accuracy [%]
Table 10-5 Dissipation factor coefficient
Parameter Coefficient
Cp, Cs, G, Rs
1
1 + D
2
D1 + D
1. If you select a secondary measurement parameter other than D, calculate D.
Table 10-6 Formula of the measurement accuracy of G, Rs, Q, and Rp
Parameter Formula
G
e
(G Accuracy)
Ge = (Ce/100) × 2 × p × f × Cx
Rs
e
(Rs Accuracy) Rs
e
= (Ce/100) / (2 × p × f × Cx)
Q
e
(Q Accuracy)
Rp
e
(Rp Accuracy)
Qe
Qx
2
± De×
1 Qx De×
+
−
-----------------------=
Rpe
Rpx
2
± Ge×
1 Rpx Ge×
+
−
-------------------------=