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Review
• The signature of a purely resistive circuit is a straight line because the relationship between
voltage and current in a purely resistive circuit is linear.
• This straight line signature can vary from
− completely horizontal (an open)
− completely vertical ( a short)
• As resistance increases
− current decreases
− the signature becomes more horizontal
• As the voltage increases
− the volts per division of the horizontal axis increases
− the internal resistance increases
Troubleshooting Applications
• The Tracker 2700 is a fast and efficient continuity tester, providing real time information.
• The Tracker 2700 will quickly locate resistor defects, shorts, opens and degradation that
other testers cannot find.
• A majority of component failures are resistive in nature. This is important to remember; a
component fault may only appear in one range because of the resistive nature of the fault.
• The Tracker 2700's ability to determine the approximate fault resistance value greatly
enhances the troubleshooting capability if the correct value is known.
The Tracker 2700's LCD is a real time display and using the Tracker 2700 for testing noisy or
dirty potentiometer (variable resistors) is an excellent application. Connect Tracker 2700's test
terminals to one fixed pot lead and the other to the pot's wiper lead. Simply monitor the wiper
signature while rotating the pot back and forth. A flawed pot would have the telltale intermittent
angular signature.
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