User Manual
CHAPTER 3. OPERATION 17
4. Wait for a few seconds.
5. When finished, the display shows “Short completed” message briefly.
6. To apply the short compensation to the measurements, select SHORT ON from the so menu.
Figure 3.8: Zeroing the kelvin clip leads
Incorrectly performing the short correction will introduce meaurement osets and
reduce accuracy.
3.5 Measurement Accuracy
Resistance and Voltage are primary measurements of this analyzer, and their accuracy is specified in the main
specifications section. Measurement of resistance, more accurately impedance, is accomplished by driving a
sinusoid signal and measuring the voltage developed across the output terminals of the unit. For a purely resistive
device, the resistance and impedance are simple, Z = r. See Chapter 6, specifically the resistance section for the
impedance accuracy, A
e
.
The measurement accuracy of the reactive (X, L and C) parameters depends on the Real impedance component.
The smaller the resistive (Real) component the more accurate the measurement. The resistive element of an
Inductor or Capacitor is related to the Dissipation (D) and ality (Q) Factors. As dissipation increases, the
relative contribution of the reactive component to the impedance is reduced.
Essentially, when the resistive component of a device’s complex impedance at 1kHz (the frequency output by this
unit) is small compared to the real impedance, the accuracy is ≈ R
acc
.
3.5.1 L,C,X,R accuracy
L, C, X D
x
≤ 0.1 A
e
= A
e
(3.1)
R Q
x
≤ 0.1 A
e
= A
e
(3.2)
L, C, X D
x
≥ 0.1 A
e
= A
e
p
1 + D
2
x
(3.3)
R Q
x
≥ 0.1 A
e
= A
e
p
1 + D
2
x
(3.4)
(3.5)