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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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  • 19/03/2017

    I bought these partly because they are meant to be easy to convert to 3 wire operation - using a separate battery to power the meter to the voltage source being measured. The instructions are to remove the link below the adjustment trimpot and solder a wire onto the 3rd connection point. What I didn't realise was how tiny the link was. I didn't realise just how tiny the link was going to be but I managed to remove it after a few attempts - surprisingly without doing any apparent damage. Then I soldered a wire to the 3rd point (the yellow wire in the photos). Connect the Red and Black wires to the +ve and -ve of a battery to power the meter (3-30v) and connect the 3rd wire (Yellow) to the +ve point to measure and link the -ve point back to the Black wire.

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  • 14/02/2021

    Ho acquistato la versione gialla del Mini Digital Volt Meter, che è importante perché è possibile che, ad esempio, la versione blu potrebbe non funzionare bene a tensioni più basse rispetto a quella gialla (non ho ancora la versione blu) (LED blu ha 3V e quello giallo dovrebbe avere >=2V ) Ho anche testato solo uno dei tanti esemplari che ho acquistato, quindi questo test non può spiegare l'accuratezza su tutti i 32 pezzi che ho acquistato. Posso solo dire che questo singolo esemplare lavorerà tra i 2,5V e i 5V testati assolutamente accurati fino alla seconda cifra. Sotto 2,5V funzionerà anche, ma il LED si dissolverà e la precisione deriva 0,1V di distanza. Sul retro sembra esserci un potenziometro, quindi è possibile regolare il Meter se non è preciso. Non ho ancora provato questo perché non voglio cambiarlo in un dispositivo funzionante. Inoltre non lo collaudo fino a 30V perché desidero soltanto usare questo molti misuratori di tensione per sovrascrivere la mia batteria 16s. Non posso dire quanta corrente consumerà perché attualmente ho bruciato tutti i fusibili dei miei contatori. Nel corso di uno shuntresistor da 1 Ohm alla sorgente di tensione 3,6V 0,009V cade, quindi la corrente a 3,6V dovrebbe essere 9 milliampere se ho pasticcio giusto. In ogni caso, Non è consigliabile lasciare il contatore LED sulle celle per tutto il tempo, per evitare scariche profonde.

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  • 07/09/2017

    I've bought this digital voltmeter to modidy my LiitoLala Lii-100 battery charger. Now I can use the charger as a simple voltage tester too.

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  • 28/02/2016

    I bought two of these RED LED units for a trial and was quite surprised by the accuracy. The little trimmer on the rear of the PCB can be adjusted to calibrate the reading. I calibrated it at 12V and found it matched all input voltages from 4V up to 29.9V. Also as a bonus you can use an independent input for the reading. Simply remove the 0R resistor from the PCB (beside the trimmer) and hook an extra wire up to the spare hole beside the (+) input. Power the unit up (5V - 30V) and it will read from 0 to 29.9v using the independent input. Using this method it should be possible to get any colour LED unit to do the same.

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  • 17/11/2017

    Very small and good quality voltmeter. I go with the blue version and i like it. Its very accurate like you can see on my pictures. Dont forget to order these https://bit.ly/MuLeads test lead wires so you can solder it to the mini tester. I will install it to my workbench so i have a mini voltmeter that i can use very fast. Also check out this nice alternative tester >>> https://bit.ly/MinVolt

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  • 30/09/2017

    This is my iforce2d cheep ass transmitter. I never knew how much power was left in the batteries until now. I purchased four of these 2 in Yellow 2 in blue. I highly recommend them. they are available in bulk also.

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  • 31/05/2015

    These are great little digital voltmeters for my drone & quad copter projects. I bought all 4 colors so I could customize my projects with their various colors. Going to order extra to have for future projects because they are priced right.

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  • 07/07/2019

    Ein sehr gutes Display das genau misst. Bei Bedarf kann auf der Rückseite justiert werden.

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