Tagged Questions

1
vote
1answer
54 views

Cable thickness for solar borehole pump

I have a solar borehole pump: 24 volts - 270 watts panels (two x 135W). I want to move my panels 300 to 350 meters away from the borehole, reducing the risk of theft. What size of cable should I use ...
-4
votes
1answer
110 views

How to find the current and Resistance?

Ok Everyone DownVoted! i am sorry about the diagram! So i Updated it this is my new diagram: simulate this circuit – Schematic created using CircuitLab Then Now how to find I1? what is ...
1
vote
2answers
165 views

Fix the Problem for Shunt Resistor due to Temperature & Current Sensor

I am trying to build a current sensor here. My original thoughts starts from this paper [real-time current-waveform sensor with plugless energy harvesting from AC power lines for home/building ...
1
vote
0answers
394 views

ACS714 5A AC Current Sensing arduino

hey guys i just got my ACS714 -5 to +5A IC i am new the current and voltage sensing i googled for tutorials on ACS714 5A but couldn't find a suitable tutorial with AC sensing. I got the code below ...
1
vote
1answer
107 views

ZXCT1009 as a current monitor

I am currently using ZXCT1009 high side monitor for monitoring the current consumption on a bus line for an embedded system we are developing. I am currently using tek scope with Labview for ...
1
vote
2answers
355 views

Current measuring with PIC

I know it is possible to measure analog voltages with the ADC peripheral of advanced PIC microcontrollers. There is no peripheral to measure current though. Is it possible to convert a current to a ...
1
vote
1answer
456 views

Difference between Open Loop and Closed Loop Hall Effect Current Sensor

I think the title says it all, but in any case, I want to know the difference between the open loop, and closed loop, hall effect current sensors, such as the LEM HAIS 200-P.
1
vote
1answer
287 views

Help with PCB design with current sense resistor

I have to perfomr battery characterization(power and current consumption measurement) of an embedded system module. I have embedded PCD and an Battery pack PCB.Therefore I am planning to include the ...
5
votes
5answers
1k views

How to calculate Power Rating for Zero Ohm Resistors?

Base on my earlier question, since there supposed to be zero voltage (V=IR) drop across a 0Ω resistor, how do we select the power rating of such component? Example, let say I were to connect a zero ...
7
votes
5answers
2k views

What is the usage of Zero Ohm & MiliOhm Resistor?

I am new to PCB design and I noticed that some schematics use 0Ω or 100mΩ resistors. What is their purpose and why do we need to use them in our PCB design? Normally if we wish to probe how much ...
4
votes
1answer
370 views

Measuring input current of opamp

I want to measure the current that goes into a noninverting opamp input. I've setup my experiment as follows: I can't measure the voltage drop across the 10M (R1) resistor directly since my DMM has ...
1
vote
2answers
229 views

Continuously Measure 3-Phase Motor Current

What methods are there for continuously monitoring the current in a 3-phase servo motor for a CNC machine and giving an alarm when the current is less than some value?
1
vote
1answer
177 views

Estimate Current Requirements Of A Circuit

So far with all my electronics circuits I have been using a DC wallwart so didn't have to think much about the current requirements of my circuits. Now I have a prototype that I would like to run ...
1
vote
2answers
105 views

what is the simplest set up for detecting ions?

I try to detect a flow of positive charged ions. These ions produce an electrical current in the order of 10^-12 Ampers. My question is that, what is the simplest set up for detecting these ions? ...
2
votes
3answers
733 views

Current multiplier/divider for current measurement?

You can change a current mirror into a multiplier/divider by adding transistors on either side. Then the number of transistors defines the current ratio. The transistors have to be integrated on the ...
2
votes
2answers
1k views

Why we use a standard of 4-20 mA

I was asked by my professor that why the standard of 4-20 mA is set for measurement of current in measurements circuit. Is there any reason why this level is used ? I mean why the value of 4 ? Can't ...
3
votes
2answers
246 views

How do I sense sinusoidal voltage/current on a resistor?

I have an experimental circuit like below: My aim is to measure maximum or effective value the current on the load. The current sensor is a simple \$ 0.1 \Omega \$, \$5W\$ resistor. I filtered ...
0
votes
1answer
214 views

Current Transducer with true RMS voltage output [duplicate]

Possible Duplicate: ICs that convert an AC signal into its true rms value Can anybody please recommend me a current transducer which has the provision of true RMS voltage output and ...
1
vote
2answers
513 views

Direct current measurement without circuit breaking

Is it possible to measure direct current without breaking the circuit? For AC parameters its no problem using current clamp. I would like to know if something like this is possible with direct current ...
2
votes
1answer
242 views

Measuring current with multimeter

I have to measure the current of a battery of 3.7 volt(used in HP IPAQ VM) and I am connection a resistor of 10 ohms in series with multimeter and the battery. Since the actual current of battery is ...
1
vote
2answers
255 views

How do I protect against voltage surges from sensors?

I'm attempting to use a CT to measure AC current. I got a lot of information in this answer to another question which led me to huge amount investigation. I want to measure the current in use by an ...
2
votes
2answers
223 views

Shunt resistor specifications do not contain thermal resistance data. How come?

I'm looking at the specifications of an ohmite shunt resistor: http://www.ohmite.com/catalog/pdf/10_series.pdf It is a 0.005 ohm resistor, rated at 2,3,5 and 7 Watts (4 different parts in the same ...
3
votes
4answers
288 views

High-bandwidth current measurement

We need to measure +-50Amps of current (PWM) on a PCB. We need the measurement to be isolated, so I thought of using an ACS758, and feeding its output to an ADC. However, this hall effect sensor is ...
3
votes
1answer
124 views

Only getting 33mA from a USB port

I attached split the end of a USB wire and attached a switch. When I press the switch, I measure 5V from the port, but am only measuring 33mA. Why am I getting only 33mA instead of 100mA?
5
votes
3answers
316 views

Total current consumed from a battery

I would like to know how could I know the current consumed from a battery using this sensor, or other similar, using a microcontroller. What I would like to know is shown in this video, where you can ...