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Changes in Proportional Errors in Measurement of 3-terminal Device
When measuring impedance, the relations between the residual impedance held by the
fixture's connectors and the contact resistance and Z
the actual measured voltage differs from the voltage applied to the device. This causes
changes in the values of the proportional errors.
Figure 4-2
Changes in Proportional Errors in Measurement of 3-terminal Device
For example, when measuring a ceramic vibrator with load capacity, the relation between
changes in proportional errors and the load capacity can be expressed as follows.
C
Chapter 4
Specifications and Supplemental Performance Characteristics
f: Measurement frequency
Csx: Measured value for Cs
Rsx: Measured value for Rs
A
0.4 + [{1.2
is the load capacity value pF.
L
Supplemental Performance Characteristics
, Z
(Figure 4-2) have the effect that
a
b
2
×
×
(6 + C
)}
(f / 100)
]
L
[%]
43
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