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  • 24/09/2015

    Bez przeróbek mierzy dwuprzewodowo (zasilanie pobierane z mierzonego napięcia) od 3,5V do 29,9V. Powyżej 29,9V pokazują się poziome kreski i świecą wszystkie kropki. Aby przerobić na zakres od zera trzeba wylutować diodę oznaczoną S4 (czarny sześcianik) i w miejscu kontaktu plusa diody przylutować oddzielny cienki przewód do zasilania stabilizatora napięcia (oznaczenie 7133H) osobnym napięciem dodatnim względem masy (czarny przewód) w granicach od +3,5V do +30V. Mierzone napięcie dodatnie podłączyć jak poprzednio między przewody czarny i czerwony. Niestety woltomierz nie mierzy napięć ujemnych względem masy (czarny przewód). Niewielkie wymiary pozwalają wbudować go w zasilacz, prostownik itp. Żurek Janusz

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  • 18/11/2017

    This meter is quite nice. I had to calibrate almost all of these meters I bought. Once calibrated they were fairly accurate. The LEDs were not seated on any of the circuit boards. I was able to desolder the LEDs and resolder them so that they were properly seated. Very good value overall. I noticed that there was a location for a third wire. I traced the circuit and realized that if the zero jumper was removed and a third wire was added, it was possible to measure voltages down to zero. Please look at the photo to see the jumper location. The red and black wires must be connected to a power source, the white wire is connected to what voltage you want to measure. You must connect the ground of the power source to the ground reference of the voltage you want to measure.

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