AKTAKOM AM-6000 digital milliohm meter and the measurement of low resistance

09.05.2022

AKTAKOM AM-6000 digital milliohm meter is designed to measure low active resistance of circuits and their elements as well as the resistance of motor coils, transformers and also it can be used in debugging processes and for laboratory research.

There is four-wire (4-wire) scheme implemented to take the precise measurement of low resistance with AM-6000 and to escape the affect of stray resistance and the measurement leads resistance.

On every measurement sub-range they use its own test current I_s which flows from T₂ to T₁ terminal. The same current flows through the resistance under measurement R (resistor). AM-6000 measures voltage V_x on P₁ and P₂ terminals which equals as follows:

V_x=I_s * R_x

In accordance with V_x value the device automatically counts the value of the unknown resistance R_x.

R_x=V_x/I_s

Thus the stray resistance of the measurement leads doesn't affect the measured resistance between P₁ and P₂ terminals.

To measure the resistor resistance it’s necessary to connect the clamps of the measurement leads to the resistance under test (like it’s shown in Pic. 1) and to measure the resistance of the circuit section on a board you need to connect the clamps the way it’s shown in Pic. 2.

Find more details about AKTAKOM AM-6000 milliohm meter on its web page.