With the 4-wire connection, the idea is to have separate wires to deliver the measurement current and to measure the voltage drop over the resistance.For this kind of connection, 4 wires are needed, leading to the name.
There are now separate dedicated wires that will deliver the accurate current through the resistance. If there is some resistance in these wires and connections, it does not matter, because the fixed current generator will still generate the same accurate current and the current does not change as it passes through these connection resistances.
Also, there are separate wires for the voltage measurement which are connected directly to the legs of the resistance to be measured. Any resistance in these voltage measurement wires does not have any effect on the voltage measurement because it is a very high impedance measurement. There is practically no current in these wires and even though there would be resistance, it does not cause any voltage drop, so there is no error.
As a result of the above, the 4-wire connection can measure the connected resistance (R) accurately, even there would be resistance in all the connection wires and connections.
Therefore, 4-wire connection is the best and most accurate way to measure resistance or RTD sensor.
(a) Explain why a four-wire measurement should be used when using an RTD. (b) Explain why...
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op amp LM358N is used. This device is actually temperature measurement. Instead of resistor of 174Ohms, it should be a RTD or PT100, but I don't have in the lab right now, so this is simulation. With this resistance, temperature should be around 188-189 Celsius. I hope this part is clear. In the lab, for different temperatures I will put different resistor, 190 Ohms, 280 Ohms etc. Output of the amplifiers should be connected to pins A0 and A1 on...
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Temperature Mensurements: A typical instrumestation system for tem TD is shown in Figure 1 temperature measurements wag aa Figure 1: The instrumentation of a RTD thermometry (a) Briety explain the reason for incorporatinga Wheatstone bridge in the Instrumetation. What i the purpose of using resistors Ry and Re in this instrumentation? (10 pt) (b) What is the function of the resistor R and capacitor C, in this instrumentation? (5 pta) (e) The bridge is excited by 5V and perfectly balanced...