| 摘要 |
To reduce the technical complexity of a circuit for measuring the voltage drop across a variable resistor (13) located in an alternating-current circuit, the alternating-current circuit (11, 12, 14, 15, 16) is completed by a direct-current circuit (20, 19, 18, 17, 22, 23) and the direct-voltage drop across the series circuit of a first choke (18), the variable resistor (13) and a second choke (22) is measured by means of a direct-voltage meter (30). <IMAGE>
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