What is the difference between 4-wire and 2-wire Ohms measurements?
Figure 1 below illustrates the method ud in 2-wire Ohms measurement. The test current (I) is forced through the test lead into the Device Under Test (R). The Voltmeter (Vm) measures the voltage developed at the HI and LO terminals. This voltage will be from the IxR drop across the Device Under Test (DUT) as well as from the IxR from the test leads.
Measured Resistance = Vm = Rs + (2xR Lead)
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Typical Lead Resistance is in the range of 1mohm to 100mohms. This Lead Resistance will be a significant source of error if your DUT is below 10 Ohms.
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市场营销专业描述Figure 1
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Figure 2 below illustrates the method ud in 4-wire Ohms measurement. To u 4-wire ohms, four distinct connections are made to the DUT; the connections are typically called the source leads and the n leads.she is my wife>twin star
The Test current (I) is forced through the DUT as before on the source leads. However, this time the Voltmeter (Vm) measures the voltage developed only at the connection point of the n leads that are connected at the DUT.
skip是什么意思Since the input impedance of the voltmeter is many orders of magnitude larger than the DUT, negligible current flows into the Sen leads. Therefore, there is no IxR drop in the n leads over which the voltage is measured. The measured voltage will be only from the IxR drop across the DUT.
clothes是什么意思V m DMM Source Hi
Sen Hi Source Lo Sen Lo
Figure 2
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