Qualectron - QT25, the unique low cost short locator

Qmax QT25 - An Unique Low Cost Short Locator

Qmax QT25 features

QT25 uses a unique method to detect the exact PCB short circuit locations, pinpoint the
shorted components/tracks. Ideally, PCB tracks have zero resistance, but small resistance exist. The exact short location is where the instrument reads the lowest value of resistance. Such resistance can be detected with a sensitive instrument like QT25, even in power planes.
QT25 was designed to apply a drive voltage of less than 200 mV, while detecting
shorts in the populated PCBs, to avoid turning on the semiconductor devices
inside the circuit that may led to misleading results
Include two sharp probes, to poke through insulation or solder mask for contact
Four-wire measurement technique for accuracy, emimiate concern for residual probe resistance
Measure contact resistance of switches and relays in its milli-ohm mode
16 character composite alpha-numeric backlit LCD display, indicate resistance range selected, offset indication, resistance value, and unit
Resistance-dependent, modulated frequency audio tone output (whose pitch
increases with decreasing resistance value) provided

Specification
- Resistance range - 200 mΩ    -   (resolution of 100 micro ohms)
                                  2 Ω            -   ( +/– 5% accuracy)
                              200 Ω            -   ( +/– 5% accuracy)
- Digital offset capacity supported, up to 200 Ω in ohm range
- Character alpha-numeric display, indicate modes and measurements
- Four wire probe for resistance measurement
- Sharp probes to poke through insulation or solder mask, for accurate measurement
- Resistance dependent, modulated frequency audio tone indication
- Drive voltage less than 200 mV, to avoid turning on semiconductor devices in circuit
- Size : 245 mm (W) x 65 mm (H) x 180 mm (D)
- Weight : 1.8 kg
- Power : 10 Watts @ 110/220 V max