Specifications

Figure 4-18. Difference in residual parameter values due to DUT positioning
4.8.2 A difference in contact condition
A change in the contact condition of the device also causes measurement discrepancies. When the
device is contacted straight across the measurement terminals, the distance of current flow between
the contact points is minimum, thus providing the lowest impedance measurement value. If the DUT
tilts or slants, the distance of the current flow increases, yielding an additional inductance between
the contact points (see Figure 4-19.) Residual resistance will also change depending on the contact
points and produce a difference in measured D, Q, or R values. The positioning error affects the
measurement of low value inductors and worsens the repeatability of measured values.
Figure 4-19. Measurement error caused by improper DUT positioning
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