| 摘要 |
PURPOSE:To reduce a measuring error, by detecting a difference of input/output currents of a transformer by the same current probe, and detecting a difference of input/output voltages of the transformer by the same voltage probe. CONSTITUTION:An output of an oscillator 2 of a loss measuring device 1 supplies power to the primary side of a transformer to be tested 3. Also, the secondary side of the transformer 3 is connected to a load 4. In this state, a current probe 11 detects a difference of an input current and an output current of the transformer 3. Also, a voltage probe 12 detects a difference of input voltage and output voltage of the transformer 3. Outputs of the current probe 11 and a voltage probe 5, and outputs of current probe 10 and the voltage probe 12 are inputted to U-function meters 6, 9, respectively, and each cross power is derived. Subsequently, a transformer loss is derived by the sum of each cross power. |
