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| Microamps and Millivolts Measurements on UT61E |
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| bdunham7:
--- Quote from: JenniferG on December 08, 2022, 03:26:45 pm ---The PWM's duty cycle being an issue makes sense, especially at very low duty cycles like I did with the voltage reading I shared here. I can understand. I don't understand how the meter integrates or whatever.. but I do understand Integration with respect to calculus. It makes sense that the samples might not be small enough or whatever, to catch the duty cycle. --- End quote --- The actual problem is that the test signal needs to be amplified (or divided in other cases) so that it can be presented to the circuits that do the integration and analog-to-digital conversion. In that meter the ADC probably operates at a 0 - 2.2V level. So in the voltage range, the integration circuitry manages to average your pulses down into the ADC range, but in the millivolt range is used, the 5V peaks are clipped. If the millivolt range uses a 10X amplifier, then the 5V peaks would be 50V and the internal circuits of the meter just can't supply that. --- Quote ---If I wanted to measure the actual voltage, would it help to put an electrolytic cap in parallel to hold the PWM's average charge, or whatever.. I really am clueless lol. --- End quote --- Capacitor across the meter is actually the appropriate solution for getting an average reading from peaky currents in many cases. Of course you now have a new element in your circuit and you have to consider how it will affect the rest of the circuit. |
| JenniferG:
Thank you everyone for the wonderful replies. Later after reading a few electronics books (beginners), I'll come back to this thread re-read the entire thing; I'll watch the video(s) and read the articles / schematics. It'll all probably make sense to me then. There is a lot of terminology I don't understand in this thread with my current experience in electronics. |
| hugo:
Because a picture or an image is worth a thousand words: |
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