Current Measurement in Serial Line

Berkan Yüksel

Posted on 15.05.2024 16:02

I want to measure leakage current on the vehicle by using the 50 ohm shunt resistor of my sirius lv device. However, when i did serial connection from positive line of the vehicle, and measure it with the sirius lv current measurement wtih shunt, i see different values between dewewsoft and standart multimeter. What could be the reason ? Am i making a wrong connection ? Do i need to use an external shunt resistor ? Can you please help about the issue ?


Regards,

Berkan

Rok Kmetič
Customer Support Engineer
Posted on 17.05.2024 10:38

Dear Berkan,


we would need additional information, so we can support you with this issue. 

How is everything connected? Can you provide a connection diagram?

How did you set the channel in DewesoftX?


An LV amplifier requires an external shunt resistor to measure current:



For a better understanding below is an explanation of how the sensor is connected to the device:



Best regards.

Rok

Berkan Yüksel

Posted on 17.05.2024 14:09

Dear Rok,


You can find the connection which i tried to do in below picture.



Except this connection, i tried to do without shunt resistance with the current measurement option of LV channel ( though it has a shunt internal in lv connector. ) But still i cant measure correct value.


Rok Kmetič
Customer Support Engineer
Posted on 17.05.2024 14:39

Dear Berkan,


did you set the shunt correctly?

From the provided picture I noticed that you have a 0,4 Ohm shunt.

Set the External shunt to ''Custom'' and insert the values of the shunt resistor:


Berkan Yüksel

Posted on 20.05.2024 08:04

Dear Rok,


Yes i set it correctly. Could the LV channel be preventing the completion of the circuit ?

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