![]() ![]() Here I did a curve of the 2.7V Zener on some professional equipment (Keithley 2460), a simple tester could say anything from 2V to 2.9V for that 2.7V Zener, depending on test current. The difference between Zener voltage, measured voltage and rated voltage may be due to difference in current. This type of tester is not good at small inductors.ģ of the pins on the ZIF socket is a special Zener diode tester and makes it possible to test Zener diodes up to 30V. It is interesting that it can show 0ohm for ESR, when a shorted input in resistance test show 0.26ohm. The red dot on the yellow top is because the IR receiver is seeing a signal, probably from my camera flash.Ĭapacitors looks fine. I did not run a calibration cycle before testing, but it would not have made the low ohmic measurement perfect. When powering on the display shows the LiIon battery voltage and the layout on the ZIF socket (very nice). The chip below the switch (U4) must be some sort of power control and the charge circuit (U6) is mounted near the usb, led and battery connections. To get the LiIon voltage up there is a boost switcher (U5), a transformer with two outputs, one for 30V (D2) and one for 5V (D1), the 5V is regulated (U5: 78L05). On the bottom is the microprocessor (U1: ATMEGA324) with a 16MHz crystal (Y). On the top side of the circuit board is the display, the ZIF socket, the button and a IR receiver. I had to remove four screws to open the box. ![]() The charge input is a micro usb connector with a led to show charge state (red=charging, green=done). The clips are not very good, they cannot close around small pins. The tester includes a usb charging cable, clips, 3 loose pins and two components to test (led+capacitor). I found it on ebay at a seller called tomtop_sales This tester has the usual component tester and a Zener section with higher voltage, components are connected to the ZIF socket. Test of Multifunction Tester T1 Component tester Multifunction Tester T1
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