Questions tagged [current-measurement]
Measurements of the current flowing through a circuit
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How can i make this idea work in PCB?
Assume i have a source of energy (voltage source), i want to sense the voltage and current of this source and transfer this analog information to an ADC (arduino nano)
thus i have to make the voltage/...
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How can I figure out the root cause of High Current consumption of the device?
I am working on a device which has two MCUs (MCU A, MCU B). The MCUs are communicating with each other via UART.
The MCU B is an SoC (EFR32) which we are using for Z-Wave communication. So basically, ...
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Distribute power from one battery to multiple devices
I have a battery, Li-po 3300mAh 22.2V 60C. Then, I have a system (main system, so to speak) which consist of STM32MP1 MPU (operating voltage [1.71, 3.6], typ. 3.3), STA8135GA GNSS IC (operating ...
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“Opentherm” interface. Power design of a thermostat [closed]
I'm trying to understand OPENTHERM protocol (by its hardware part).
In a couple of words opentherm is a 2-wire interface used between thermostat and boiler. The data from thermostat (master) to the ...
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How do I create a circuit to reliably calculate a range of unknown resistances?
I'm designing a low power circuit which serves to determine the unknown resistance across a 16 channel sensor. So far the results are bit subpar. The resistances are a function of a different applied ...
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How to sample current in high-kHz to low-MHz [closed]
I am working on a project that, at its simplest, is a switching circuit (either a half-bridge or single switch) connected to a resonant filter. I need a way to measure/sample the current going from ...
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Brown outs with Nordic Instruments PPK2 power profiler
I have a circuit that I know works with 2 AA batteries that are nearly dead (1.4 volts total).
I want to measure the current consumption of the circuit using my Nordic Instruments PPK2 meter. The only ...
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What does an accuracy of 0.1% + 20 mV mean in a power analyzer's data sheet?
I need to know the measurement accuracy of Keysight N6705C power analyzer. I came across this document (N6700 Modular Power System Family.pdf) that states the error in terms of a percentage plus a ...
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Combining a differential amp and current limiting circuit
I've been experimenting with a very simple current limiter that regulates the current through a solenoid with a 3-4 ohm resistance.
The external driving circuit is a PWM switched N-Ch MOSFET ...
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Battery draining and resistor question [closed]
Say I have a motor that uses 9v @400ma, but it's powered by a 12v battery.
I 'd use the ohm law and get a: 7.5 ohm resistor.
But, as soon as the battery is being drained, let's say now the battery is ...
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Pulse DC reading
I'm trying to read current with INA186 on low-side. The shunt resistor calculations are ok, but the current sensed, comes from a pulse DC signal of a SCR. This SCR is rectifying the output of a power ...
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What happens when the value of resistances used in a differential input filter for a current sense amplifier circuit is too small?
I am working on a current sense amplifier circuit with the following configuration:
While the circuit works, the filter is not performing as intended. Specifically, it should act as a low-pass filter ...
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Sinking and sourcing current from and to the output of the op-amp
I need to have a set-up to sink and source current from the output of an op-amp to measure the maximum output current of an op-amp. This is the test set-up I thought of:
If the maximum output swing is ...
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high voltage moderate frequency galvanically isolated current measurement
Given a conductor carrying a sawtooth wave of anywhere between 0.1Hz and 855kHz up to +-1.5kV) and anywhere between +-(1µA...20A)(maximum 650W) i want to measure the current with about 5MS/s (so the ...
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Ignoring current spikes
I have a circuit which measures a current draw going to System A, waits for it to rise from 0.24A to 0.26A, then has a 30s delay before supplying power to System B. If the current drops below the ...
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