Calculate the resistance value
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Hello everyone. I’m a beginner in electronics. I’ve recently built a sensor that operates on a two-wire system; the resistance value it measures differs from the ideal value by 10 ohms. I’ve heard that connecting a resistor in parallel can reduce this value. Could you tell me what value resistor should be used in parallel to reduce the resistance by 10 ohms? ?
OP, the information you provided is insufficient (only the resistance difference is given; neither your desired resistance value nor the measured resistance value is provided, so it’s impossible to carry out the calculation). ), you can calculate it yourself using the formula below. The formula for two resistors in parallel is: 1/R=1/R1+1/R2 ； The forms of application are: R = R1R2/(R1+R2) = R1 = R2R/(R2-R) = R2 = R1R/(R1-R). The formula for multiple resistors in parallel is: 1/R = 1/R1 + 1/R2 + … + 1/Rn.
The resistance value of a resistive sensor should change in accordance with the signal variations. If accuracy throughout the entire signal range is required, it seems that adding a resistor externally won’t suffice; solutions must be found internally. However, if only the accuracy of specific signal outputs is important, then the appropriate resistance value can be determined using the calculations mentioned in point 1.
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Is your sensor used to measure temperature? If measuring temperature, resistors cannot be connected in parallel!