Measurements of the current flowing through a circuit

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A DMM low current measurement question

I'm stuck with a question when reading a textbook: The question is a situation as follows: The very high internal resistance of digital multi-meters, in their voltage measuring ranges, can be used ...
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3answers
68 views

Relatively cheap hardware to log current draw of embedded system [on hold]

I have the need to measure the current draw over a period of an embedded system. Usually the system will be in low power sleep mode, but it will wake up periodically to take a sensor reading and send ...
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1answer
41 views

ACS712 Low Current Sensor

Before I begin, just to let you know that I'm new to electrical engineering, in case that my question sound weird to you, but here's my problem. I bought few days ago ACS712 Low Current Sensor and ...
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1answer
59 views

How much power could a 5 x 3 cm turbine and a 5 x 5cm solar panel generate? [closed]

I would like to make a project and generate a few power using a combination of a small wind wheel (let´s say 5 x 3 cm wheel) and a small 5 x 5 solar panel. I am not sure what the median wind speed is ...
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1answer
57 views

How to measure micro and nano amps via microcontroller [closed]

The objective is to build/construct a circuit powered by an ATMEGA32 IC, using C++. This circuit will essentially be an ammeter for small current levels (10-6 and 10-9). I've done some basic points ...
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30 views

By measuring the electricity generated, is it possible to calculate how fast the turbine was moving?

Say a wind turbine is moving at varying speeds. From the electricity it generates, would it be possible to calculate/replicate the motions of the turbine? How accurate can these measurements be? Will ...
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1answer
28 views

DS2438 battery monitor: how to connect load

I am looking at the datasheet for the Maxim DS2438 battery monitor and am confused by this circuit diagram: How would the load be connected? If connected between battery + and circuit ground this ...
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1answer
39 views

Resistance measurement using high side current sense amplifier

I want to measure very small resistances (0.5 to 1 Ohm) using a high side current sense amplifier. The device I have in mind is MAX9611. The typical application circuit from datasheet is like: My ...
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1answer
46 views

Common ground between a current source and a power supply

I want to design a simple circuitry for testing a bench top current source through a load resistor. I want to use MAX9611, and read data through I2C by a micro-controller. The rough circuit schematic ...
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2answers
59 views

High voltage DC current measurement by inductance?

I'd like to incorporate a few permanent ammeters in a 600V DC circuit. I've found all sorts of nifty panel ammeters, both analog and digital, but most are rated to less than a tenth that voltage. I ...
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0answers
34 views

MPPT using pic16f877a (solar battery charger)

I'm trying to charge some batteries using 12v solar panels. I'm using a pic16f877a for the mppt algorithm(incremental conductance). I have two problems: 1)Current Sensing: I want to use acs712 (5A) ...
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4answers
54 views

determining current in individual phase for a 3 phase winding brushless dc motor

I have an 3 phase brushless dc motor with no neutral wire. I measured the resistance from phase to phase and found them to be on average 0.255 ohms(between A and B, A and C, etc...all the values are ...
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4answers
125 views

Low-side current sensing

I'm trying to build a brushless dc motor driver, which provides the possibility to measure the currents on all three phases of the motor independently. The driver IC that I'm using (DRV8313) has three ...
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1answer
41 views

AC power measurement query

I'm trying to understand and tweak this smartplug reference design from TI. I'm stumped on the Metrology Analog Filters section on page 1. What I do not understand is why is there a 0R resistor on the ...
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2answers
42 views

Measure current in power suppy [closed]

I have a power supply which I ordered online for 100 amps. I thought it will be digital but its an old fashioned type. I want to build the current sensing circuit to find out how much current is ...
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1answer
57 views

Measuring DC current with Hall Effect sensor over PIC on the same circuit

Before I begin with my question just so you know I'm not very familiar with electrical engineering so please forgive if I ask some dumb question :) What I want is to know if I can use Hall Effect ...
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0answers
51 views

practical design of integrator circuit with Rogowski coil

I am designing a current sensing device, using a rogowski coil.To give a simple explanation of the Rogowski coil, if I were to disregard parasitic components L2, R1, C1 and R2 the output voltage would ...
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1answer
27 views

Why is bi-directional current sensing required in sensorless BLDC field-oriented-control?

For the past few weeks I've been trying to understand Field-oriented-control for 3-phase motors. Eventually I would like to implement one. I've gone through dozens of application notes from Microchip, ...
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1answer
36 views

Current Transformer properties

I have a mains track (230VAC, 50Hz) on a custom PCB routed to multiple Solid-State Relays, and I want to measure the power going through this line. I'm looking into Current Transformers (CTs) to ...
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0answers
40 views

How to measure 3phase RMS currents in PSCAD

I would like to measure 3 phase rms current as well as voltage of a load, In PSCAD 3ph rms voltage measuring block is available but there is no such block for current.
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1answer
63 views

FET Current limiter 30A and overload detection

I plan to make a module for my motorbike to replace fuse by current limiters and overload detection system. I've heard nice things to do with J-FET. It should work up to 12V 30AMP. The detection ...
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2answers
93 views

How to make ammeter with arduino?

i'm interested to make ammeter from arduino. So, i have 70A/50mV shunt resistor and wiring it into arduino. From my schematic, Is this possible to meassure the current from 12V battery?If it possible ...
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2answers
68 views

ADC error for low-voltage measurements

The application is high-side current sensing for a battery-operated device. The current drawn from the battery goes through a shunt resistor, the voltage across the resistor is amplified by an INA, ...
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0answers
38 views

Effects of introducing offset in a current sense amplifier

I am working with the MAX9643 current sense amplifier in a configuration similar to this. I need to introduce a small offset in the output voltage. What are my options of doing this? Can I directly ...
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1answer
199 views

Current sensing at μA accuracy and ADC nonlinearity

Project context A battery-operated positioning device sends location information through GSM at regular intervals. Between the fixes, the device is in low-power mode. The battery is supposed to last ...
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34 views

High voltage reading isssue

Here i am attaching old and new schematic for reference.While designing the old board i have made mistake keeping HV- (j14) as common ground reference . J14 and j12 are connected with high voltage ...
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1answer
30 views

Current in a galvanic cell

I was looking through chemistry textbooks to find out how to determine how much current a galvanic cell should generate and what affects that current value. However, I did not find anything: textbooks ...
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1answer
69 views

What type of fuse should I use for this basic electronics design?

I'm creating a simple Arduino project that utilizes a solenoid and a rotary encoder. I'm powering the entire device with a 12V 5A switching power supply. I want to add a fuse to the design but can't ...
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2answers
58 views

why is the current of a aluminum-hydrogen galvanic cell low

I am having a galvanic cell with the following half cell equations: Anode--> 2Al(s) + 6OH --> 2Al(OH)3 + 6e- Cathode--> 6H+ + 6e- --> 3H2(g) I connected my cell to a 47 ohm resistor and measured ...
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2answers
44 views

measuring a bad motor and large current spikes in a brush motor [closed]

I am new to this forum, I am an EIT and I have been tasked to implement a fixture to measure high current spikes on brush motors when loaded and unloaded. I am at a loss here as I have never ...
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1answer
43 views

Rogowski coil with magnetic core

is it possible to use a rogowski coil with a magnetic core? ie i want to integrate the output of such coil rather to place a resistor on it. so, what is the differences between it and a current ...
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1answer
53 views

What does the values or details mean? [duplicate]

You can see some values on all electronic devices like 5V,0.2/0.3A on mobile chargers.What do these values represent?what can we understand from them
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1answer
100 views

Piezoelectric Voltage and current measurement across a 3.3kohm resistor.

I am testing a PZT 43 material with tapping sequence. The measurement of the material is: 10mm in length and 0.8CM in diameter. I am tapping the material with a plastic and holding it down with a ...
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1answer
42 views

DC Fan using less than half of rated current. Looking to overvolt

I have a project involving a 200mm 12VDC PC cooling fan (FS-200RB) that will be used for cooling me - not a computer. The fan is labeled: 12V DC / 0.42A / 5.04W ...
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1answer
14 views

current of a galvanic cell

I am having a galvanic cell with the following half cell equations: Anode--> 2Al(s) + 6OH --> 2Al(OH)3 + 6e- Cathode--> 6H+ + 6e- --> 3H2(g) So my cell is producing 6 electrons. Is there a way to ...
2
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1answer
133 views

How to measure supply currents ranging from 1μA to 10mA?

I’m building a battery powered data logger with a microcontroller and several sensors. I’d like to measure the supply current of individual parts with idle currents in the μA range and peak currents ...
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1answer
54 views

how to measure current of a galvanic cell with a voltmeter

I was wondering how I could measure the current generated by my galvanic cell: can I just directly connect my voltmeter to the two electrodes of my cell, or do I have to put it in series?
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2answers
95 views

Current limit using MOSFET

I am driving a 24V DC Motor which can draw up to 30A and I would like to incorporate some over current/short circuit protection. As such I am planning to place a shunt resistor and power ...
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2answers
49 views

Low side current measurement

I have a system similar to the one given by schematic. There is a 12V battery used for supplying MCU board and couple of distributed boards(inverter/measurement network etc.). Since I want to measure ...
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2answers
47 views

Problem with expected and actual current

I measured the voltage generated by my wind turbine as 0.91 V with a load of 180 Ohms. So theoretically, using ohms law, my wind turbine should produce an amperage of 0.05A. However, it produced ...
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2answers
39 views

Are “Apk” and “Amp peak-to-peak” the same thing?

Folks, What is the difference between "Amp pk or Apk" vs "Amp pk-pk (or Amp peak to peak?)" Are they the same thing?
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1answer
69 views

how to measure current generated by wind turbine

I was wondering how to measure the current generated by a wind turbine? I tried connecting the voltmeter to the metal connectors of the motor (the 2 metal parts that stick out the motor) and set my ...
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1answer
112 views

from this three which one is the best best current measuring method?

so i'm planning to build a battery power meter where it will measure voltage,current,mAh,WH ,and i have created the voltage divider for voltage measurement ,but i cant decide which current measuring ...
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2answers
52 views

Maximum current available from a source [duplicate]

How can we find the maximum current a source can provide,say if my device need 1amp and the source can provide 2 amps in the rated voltage will my device only draw 1 amphere or will it draw 2 amp in ...
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2answers
216 views

Best way to calibrate ADC for current sense MOSFET

I'm using the infinion BTS6143 as a current switch and current measurement device in combination with an STM32 controller. The BTS6143 is an integrated MOSFET with internal charge pump and ...
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1answer
95 views

How to measure a BC-547 transistor's details?

I am new in electronics. What I am trying to do is measuring everything of BC-547 transistor's details from a basic circuit design practically. I want to measure as example: collector-emitter ...
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1answer
131 views

PCB Current Shunt Design

I want to use a shunt resistor to measure the current flowing though a section of my circuit. I am deciding between using an off the shelf shunt resistor or simply drawing a wide track on my PCB and ...
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2answers
47 views

The effect of input current from a voltage regulator

I have an input voltage of 24VAC and I'm converting that to 5VDC by using a simple diode and an LM2596S-5.0 (A switching regulator powered by a simple half-wave rectifier). I expect to draw roughly ...
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2answers
106 views

Twisted pair for long distance voltage measurement

I want to measure the voltage drop across a shunt, but the ADC performing the measurement will be far from the actual shunt - perhaps five meters. I'll need to measure voltage drops across the shunt ...
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4answers
94 views

Measure indcutor ripple current in a SMPS

I need to measure the ripple current in a buck converter. In general, I add leads to the inductor and use a current probe. My issue now is that the inductor I am using has such a low inductance that ...