NI PXIe-4154 Programmable Output Resistance

NI DC Power Supplies and SMUs Help (NI-DCPower)

Edition Date: January 2018

Part Number: 370736U-01

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As non-ideal voltage sources, batteries have internal series resistance. This internal resistance varies based on the chemistry used for different battery types. The internal resistance can be affected by a number of variables including how the battery is used, level of charge, and age.

Internal resistance causes a battery's voltage to drop as higher currents are drawn. As the current increases, so does the internal voltage drop due to Ohm's Law (V=I×R). This causes the voltage at a battery's terminals to decrease as the current increases.

If the internal resistance and the current drawn from a battery are high enough, the output voltage can drop significantly, regardless of how much charge it is holding. For battery-operated devices, if the voltage drops below a certain threshold it causes the device to shut down. This demonstrates the large role internal resistance can play when testing battery-operated products.

You can program channel 0 of the NI PXIe-4154 to vary the output resistance from -40 mΩ to 1 Ω. The positive range of the output resistance allows the channel to emulate the internal resistance of a battery over its lifetime. The negative resistance range allows you to compensate for voltage drops due to resistive losses between the remote sense points and the DUT terminals.

To set the output resistance, use the niDCPower Configure Output Resistance VI or the niDCPower_ConfigureOutputResistance function.

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