Measuring Circuit and Method for AC Resistance Time Constant
A technology of AC resistance and time constant, applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problems of complex measurement circuits, inability to meet industrial needs, cumbersome measurement process, etc., and achieve simple circuit connection, The measurement process is convenient and fast, and the effect of high accuracy
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Embodiment 1
[0044] This embodiment provides a measurement circuit of AC resistance time constant, such as figure 1 Shown, where the measured AC resistance R X For both ends of the resistance, including:
[0045] A power supply U, an isolation transformer T, the two ends of the primary winding of the isolation transformer T are connected to the power supply U; a bridge structure, the first node A and the second node B of the bridge structure are respectively connected to the isolation Both ends of the secondary winding of the transformer T;
[0046]Phase table 101, the first node A is connected to the input terminal of the phase table 101, the second node B is connected to the reference terminal of the phase table 101, the first node A and the second node B is connected to the phase meter through a shielded wire 103 .
[0047] The bridge structure includes a bridge balance adjustment branch and a measurement branch, and the measurement branch includes:
[0048] Standard capacitor C N ...
Embodiment 2
[0090] This embodiment provides a measurement circuit of the AC resistance time constant, wherein the measured AC resistance R X is a four-terminal resistor, such as Figure 4 shown, including:
[0091] Power supply U', isolation transformer T', the two ends of the primary winding of the isolation transformer T' are connected to the power supply U'; bridge structure, the first node A' and the second node B' of the bridge structure respectively connected to both ends of the secondary winding of the isolation transformer T';
[0092] Phase table 201, the first node A' is connected to the input terminal of the phase table 201, the second node B' is connected to the reference terminal of the phase table 201, the first node A' and the The second node B' is connected to the phase meter through a shielded wire 203;
[0093] The bridge structure includes a bridge balance adjustment branch and a measurement branch, and the measurement branch includes:
[0094] Standard capacitor C'...
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