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The impedance of cells and battery packs varies according to a variety of factors, such as, but not limited to, chemistry, mechanical construction, number of charge/discharge cycles, temperature, and depth of discharge. In applications using batteries with dynamic or pulsed current loads, the voltage across the DUT may vary significantly. If the peak load current is high enough, the voltage drop caused by the impedance of the battery may compromise the performance of the device, including shutdown if the voltage transient is below the operating threshold. This phenomenon is common in TDMA and GSM cellular handsets where the magnitude of the high and low current levels during RF transmission vary by as much as a factor of 20. In the absence of any filtering capacitance between the battery and the RF power amplifier, the handset will shut off if the supply voltage is below the operating threshold for periods as short as several microseconds. The variable impedance output, available exclusively in the Model 2302/2306 battery simulators, enables test and design engineers to simulate the transient voltage response of a battery with pulsed current loads. 下載： 
2191_BatteryImpedance.pdf
(47.7 KB)
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