Impedance measuring device and impedance measuring method
A measurement device and measurement method technology, applied in the direction of measurement device, measurement of resistance/reactance/impedance, measurement of electrical variables, etc., can solve problems such as difficulty, difficulty in removing noise, impedance value deviation, etc., to reduce measurement errors and stabilize measurement values. , rapid results
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[0069] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a schematic diagram of the structure of the impedance measuring device according to the first embodiment of the present invention, and shows the connection structure when measuring the noise component.
[0070] The constant current source 10 is connected to a sample (DUT: Device Under Test) 11 to be measured via a switch SW1. In this embodiment, the sample 11 is a battery and has an internal resistance Rx. The current detection resistor (Rs) 12 is inserted in the series circuit of the constant current source 10, the switch SW1, and the sample 11. The switch SW2 is inserted between the constant current source 10 and the switch SW1, and between the sample 11 and the resistor 12 for current detection. The detection signal of the sample 11 is input to a plurality of band pass filters (BPF) 17 via the amplifier 15 1 , 17 2 ,..., 17 n in. Switch SW3 selects band ...
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