QT25 uses a unique method to detect exact PCB short circuit locations and also pinpoint the shorted components/tracks. Ideally PCB tracks are suppose to have zero resistance, but in actual conditions they have small resistance. The exact location of the short is where the instrument reads the lowest value of resistance and this resistance could be detected with a sensitive instrument like QT25, even in power planes.
QT25 is designed to apply a drive voltage of less than 200 millivolts, while detecting shorts in the populated PCBs, so as to avoid turning on the semiconductor devices inside the circuit, which could lead to misleading results.
The system comes with 2 sharp probes to poke through the insulation or solder mask in order to make a good contact.
QT25 uses 4 wire measurement technique for accuracy thereby eliminating the need to care about the residual probe resistance.
QT25 can also be used in measuring the contact resistance of switches and relays in its milli-ohm mode.
There is a composite '16 character alpha numeric backlit LCD display' to show the Resistance range selected, Offset indication, Resistance value, and also the Units.
Resistance dependent, modulated frequency audio tone output (whose pitch increases with decreasing resistance value) is also provided.
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