Agilent Technologies 4294A Specifications download pdf (Page 72)

Figure 4-17. Difference in residual parameter values due to DUT positioning

4-7-2. A difference in contact condition

Change in contact condition of the device also causes measurement discrepancies. When the device

is contacted straightly across the measurement terminals, the distance of current flow between the

contact points are minimum, thus providing the lowest impedance measurement value. If the DUT

tilts or slants, the distance of current flow increases, yielding an additional inductance between the

contact points. See Figure 4-18. 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 mea-

surement of low value inductors and worsens repeatability of measured values.

Figure 4-18. Measurement error caused by improper DUT positioning

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Agilent Technologies 4294A Specifications Page 72