Her finder du Harald Nyborgs udvalg af multimetre og spændingsmålere. Med et multimeter kan du, som navnet også refererer til, måle et utal af ting. Altid stort udvalg i multimetre, spændingsmålere og elartikler hos Harald Nyborg.
Du kan måle alle tre størrelser i det . Apr Digital multimeter med diodfunktion, testkabel och skalavväljagre för alla typer av strömenheter.
Here are my tests. White LED (rated at V 20mA) test, no resistor in circuit ran at 3. A (fan would run) I believe that the problem is with the scaling. Has someone of you experience how a high precision multimeter is constructed ? How is the voltage reference stabilized?
Are the input voltage divider temperature stabilized ? Harald Kapp said: The temperature probe may draw too much heat from a small solder tip. Or the thermal contact between tip and probe is ba thus transferring not enough energy to the probe.
In contrast once the solder starts melting it will cover the solder tip and thus help to transfer more energy to melt . Use a multimeter in Ω-range to check conduction of the transistor when LED is on, non-conduction when LED is off.