Timeline for Measuring high-side vs low-side current, different readings?
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 10, 2020 at 0:53 | comment | added | Alexander Stohr | there might be the chance that having some wires close to certain circuits and parts an effect is created that impacts on power consumption of the device. coil based amperemeters would definitely have a magnetic field. and such fields can impact on e.g. feritic beads as well as on air coils and on transformers. - reminds me of the teacher that once had built an oscillator and it ran only when he attached a measurement device. in the end he used a resistor of similar value as the meter - and his oscillator continued to work. - thats the impact of doing measurments. | |
| Dec 9, 2020 at 3:47 | comment | added | Sredni Vashtar | @wolf9000 can you take the batteries out of the equation and supply the device with an external voltage supply? Are we talking button batteries - as I would expect in a calculator - or sealed lithium batteries? Because if we were to believe the readings, maybe there's a leakage that introduces a 'third' terminal between the + and - (and the circuit will close through the pcb or metallic chassis). I doubt it, but just to rule out something is happening between the poles... | |
| Dec 9, 2020 at 2:42 | comment | added | wolf9000 | It is interesting that out of almost a dozen various devices, currently actually only one shows this behavior, and quite consistently. | |
| Dec 9, 2020 at 0:48 | history | answered | Alexander Stohr | CC BY-SA 4.0 |