5-
19
• Capacitors have elliptical signatures due to the current and voltage phase shift.
• As the test signal's frequency increases, the capacitor's signature becomes more vertical due
to decreasing X
C
of the component.
• Capacitors with leakage flaws have their ellipses tilted diagonally due to an internal
resistance in parallel with the capacitance.
Applications
• The Tracker 2700 can locate defective capacitors in or out of circuit. The ranges cover
approximately 10pF to 16,000 µF.
• When analyzing a capacitor's signature, adjust the Tracker 2700's R
S
and F
S
for the most
pronounced ellipse.
• The test signal frequency F
S
can be changed to enhance a composite signature by
emphasizing or de-emphasizing the capacitance.
• Besides resistance, faulty capacitor signatures often exhibit other irregularities such as non-
symmetry, broken or distorted ellipse and saw-toothed shapes that can be seen on the LCD
display.
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