Shunt Resistor Tolerance

4 in this example the total reading uncertainty is 25. The resistance value is given by the voltage drop at the maximum current rating.

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The wsms2906 meter shunt resistor produces resistance values from 300u to 660u.

Shunt resistor tolerance. Current measuring instruments by themselves can usually accept only limited currents. The total shunt tolerance is expressed in percent. Meter shunt resistor has 5 tolerance values.

The shunt has a certain tolerance that affects the measurement. The specified tolerance of the shunt resistor refers to the reading uncertainty. Typical shunts are generally rated to have a voltage drop of 50 mv at their rated current.

Low value of tolerance leads to increase in accuracy of current being measured. Tolerance temperature coefficient minimum operating temperature maximum operating temperature voltage rating case code in case code mm technology termination qualification packaging. So if you have 4 resistors in parallel all 100 ohm with tolerances 01 1 5 and 20 the overall tolerance rating will be 20.

To find the total uncertainty the tolerance of the shunt and the reading uncertainty of the measuring instrument are added in quadrature. When paralleling resistors of the same resistance value the combination is only as tolerant as the least tolerant resistor. For example a shunt resistor rated with 100a and 50mv has a resistance of 50 100 05 mohm.

These are precision etched to a standard tolerance of 025 while the rsn series features a tolerance of 01. Shunt resistors have a maximum current rating. The total shunt tolerance includes the initial tolerance plus temperature drift when temperature effect needs to be considered.

The very low resistance values required for shunt resistors 10 mw at 5 a and just 0005 mw at 10000 a are provided by manganin resistive elements. The voltage drop at maximum current is typically rated 50 75 or 100 mv. An ammeter shunt is a special type of current sensing resistor having four terminals and a value in milliohms or even micro ohms.

The resistance of the shunt is temperature dependent. Unless otherwise stated in this presentation shunt tolerance and total shunt tolerance are interchangeable. And its tolerance is in the range of 1 ohm or even less than that.

In shunt resistor that is used for measuring current a high precision small value resistor is required. Vishays power metal strip meter shunt resistors wsms2906 and wsbs8518 feature a proprietary processing technique that produces extremely low resistance values and a high power to resistor size ratio. Armed with a suitably sensitive voltmeter its possible to measure large currents relatively safely something not achievable with the average multimeter.

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