5-
15
X
c
=
1
2 fC
π
X
C
is inversely related to both capacitance and frequency. So to review and summarize
capacitive tracker signatures up to this point:
• Changing capacitance: As the capacitance of a circuit increases, the capacitive reactance X
C
decreases. This means that when capacitance increases, the amount of current in the
component or circuit will increase. On the Tracker 2700, the elliptical signature will become
increasingly vertical which implies more current flow.
• Changing frequency F
S
: As the frequency of the test signal increases, the capacitive
reactance X
C
will decrease and the amount of current in the circuit will increase. On the
Tracker 2700, the elliptical signature will become increasingly vertical which implies more
current flow.
• Changing voltage V
S
: As the test signal voltage is changed from 200 mV to 20 V, the
following occurs:
− X
C
of the capacitor is not affected
− The applied Voltage increases
− The elliptical signature is not affected
• Changing source resistance R
S
: As the resistance is changed from 1 kΩ to 100 kΩ, the
following occurs:
− X
C
of the capacitor is not affected
− The elliptical signature becomes increasingly vertical
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