Meter for the display of the internal resistance of a battery

摘要

In a device for the display of the electrical internal resistance of non-ideal voltage sources of respectively rechargeable and non-rechargeable batteries, provision is essentially made of a simple alternating current source for the drive with a parallel-connected frequency-selective amplifier stage for signal preparation, so that the measured signal is connected to a display as a proportional variable for the internal resistance. A four-wire lead provided as far as the test probes does not falsify the measuring result because of lead losses. A handy design makes for a simple-to-operate measuring device for battery diagnosis.