Can a CE4 or CE8 be used as a current source, measuring the voltage drop across a resistor to calculate resistance?

While this could be done for a maximum resistance of 50 ohms in the ±2500 mV range and 100 ohms in the ±5000 mV range, it is not the best way to determine resistance. The preferred method for measuring an unknown resistance is to use data logger excitation channels. Current excitation channels can be used with a CR3000. Analog excitation channels with half-bridge or full-bridge circuitry can be used for other data loggers. See the specific data logger’s manual for further details

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