Fluke 867B User Manual page 43

867B/863
Users Manual
Using COMPONENT TEST Softkeys
2 20 200
Hz Hz
Use COMPONENT TEST to measure the
characteristics of a passive component (in or out of
circuit, no power applied). When you use the
General Measurement Connection, the GMM
provides an ac stimulus signal to the component and
plots the voltage drop against the current
measurement. The resulting pattern provides
information about passive circuit conditions.
Generally, resistors exhibit some form of straight or
angled line. Diodes or transistors appear as straight
lines with right-angle ends. Frequency-sensitive
components (inductors, capacitors) portray some
form of an ellipsoid pattern based on the current-
voltage phase shift dictated by the stimulus
frequency and the inductance or capacitance.
Combinations of these components exhibit hybrid
patterns. Although the number of such
COMPONENT TEST signatures can be limitless,
you will become familiar with a few characteristic
signature patterns that will greatly aid in component
2-18
2 18.75
Hz kHz kHz
and circuit diagnosis. Some sample signature
patterns are shown on the following page.
Press one of the softkeys to select the frequency of
the stimulus signal. For components that do not
change impedance with frequency (resistors, diodes,
and transistors), the frequency selection is not
critical for a meaningful display. For components that
do change impedance with frequency (inductors and
capacitors), an appropriate COMPONENT TEST
frequency selection is necessary. Inductance greater
than 8.5 mH can be displayed. Capacitance can be
displayed according to the guidelines in Table 2-2.
Table 2-2. Component Test (Capacitance)
Frequency
2 Hz
20 Hz
200 Hz
2 kHz
18.75 kHz
Capacitance
0.72 µF to 72 µF
0.072 µF to 7.2 µF
7200 pF to 0.72 µF
720 pF to 0.072 µF
77 pF to 7700 pF