5-
12
The Signatures Of Different Capacitors at 10V/100Ω
ΩΩ
ΩRange
The figure below shows tracker signatures for four different value capacitors, 1000 µf, 100 µf, 10
µf and 1µf. The Tracker 2700 10V/100Ω
ΩΩ
Ω range is selected.
1000 µF 100 µF 10 µF 1 µF
10V, 100Ω
ΩΩ
Ω F
s
=60 Hz
Figure 5-14. Signatures of 4 Capacitors
Note that as the capacitance values decrease, each signature changes from a vertical elliptical
pattern to a horizontal elliptical pattern. In TSA, a large value capacitor has a signature that looks
similar to a short circuit. And likewise, a small value capacitor has a signature that's similar to an
open circuit.
Effect of Frequency (F
s
) on the Signature of a 10 µ
µµ
µF Capacitor
F
S
= 20 Hz. F
S
= 60 Hz. F
S
=200 Hz. F
S
= 2000Hz.
10V, 100Ω
ΩΩ
Ω Range
Figure 5-15. Signatures of a 10 µF Capacitor at Different Frequencies
Note that as the test signal frequency increases, the 10 µF capacitor's signature changes from a
horizontal elliptical pattern to a vertical elliptical pattern. In TSA, a capacitor at a low test
frequency has a signature that looks similar to an open circuit. And likewise, the same capacitor
at a high frequency has a signature that's similar to a short circuit.
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