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How to sense DC current

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Dear Mithun_K_Das,

There are many methods:
1. Non-isolated solution: using a small resistor (around 1mOhm) in series with the DC current path, most probably you will need a signal conditioning stage to get a reasonable voltage levels proportional to the measured current
2. Isolated solution: using a current transformer (for AC currents only) with a suitable ration, say 1:1000
3. Isolated solution: Using hall-effect sensors

Check the attached pdf for method 1.

Best regards.
 

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Here's a link to a Hall sensor that might work for you: **broken link removed**

If you want an simple, off-the-shelf solution, check out various hobby sites that cater to electric models (almost all sites do nowadays). Current monitors for DC are quite reasonably priced.

John
 

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I need to do in isolated way and also need to measure DC current so CT is not applicable for this case. As current is high(20-100A) so resistive loss may create power loss.

Anyway thanks for 01332A.pdf file. its very helpful.
 

I need to do in isolated way and also need to measure DC current.
Click to expand...
Then all flavours of hall effect sensors shoudl be considered:
- closed magnetic circuit compensating sensors (highest precision)
- closed magnetic circuit direct measuring
- open magnetic circuit
 
Thank you everybody. I also recommend hall sensor. I found some helpful information from 'sapna.dudani@gmail.com', 'jpanhalt' & 'moataz foua' && Thank you all. It will depend on my local market. I think hall sensor will be reliable for this measurement.

But, can anyone tell me that what technique is used in DC Clump meters for DC current measurement?
 

Hi Mithun,
Another way, the easiest, is to use a DC CURRENT Clamp meter with a range up to 1000 Amperes.
 

But, can anyone tell me that what technique is used in DC Clump meters for DC current measurement?
Click to expand...
As all contactless DC current sensors, a clamp meter uses hall sensors.
 

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