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380462 Datasheet(PDF) 4 Page - Extech Instruments Corporation. |
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380462 Datasheet(HTML) 4 Page - Extech Instruments Corporation. |
4 / 5 page Model 380460 and 380462 Version 2.1 March 2005 4 Measurement Equations Vx = Is x Rx; Where Vx is the voltage (measured by the meter) across the device under test; Is is the test current; Rx is the resistance of the device under test. From Vx = Is x Rx, the meter moves to the next step which is: Rx = Vx/Is. With this equation the meter determines the resistance of the device under test. Note that the measured resistance (Rx1 & Rx2) is not affected by stray resistance since the test current is supplied directly to the device under test. This is the advantage of the 4-wire Kelvin lead configuration over 2-wire methods which introduce errors into low resistance measurements. International Symbols Powering the Meter Connect the meter to the correct power source (110 or 220VAC); the Model 380460 uses 110VAC and the Model 380462 uses 220VAC (note that these meters are NOT interchangeable). Do not apply voltage to the meter input measurement terminals. Meter damage may result. Measurement Procedure 1. Rotate the Range select switch to the 200m range to prepare for zeroing. Ensure that 200m is selected on the 200m select switch. 2. Perform a Zero Adjustment per the following: • Short the Kelvin Clips as shown in the diagram below. • Rotate the Zero Adjust Knob until the meter indicates zero units. 3. Select the desired measuring range via the rotary Range select switch. When using the 200m range, put the 200m select switch to the 200m position; for all other measurements put this switch in the opposite position. 4. Either clip the leads onto a component or clip the leads between two points in a circuit. 5. Observe the meter reading. |
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