| 摘要 |
PURPOSE:To flow constant currents to samples and to display the breaking of wire, by connecting the samples in series to an AC constant-current source, and providing bypass circuits and means of indicating that currents flow through the bypass circuits in parallel to the samples. CONSTITUTION:Samples 1 are connected in series and further connected to an AC constant-current source 3. A reed relay 4, a photothyristor coupler 6, and a trigger diode 5 are connected to each sample 1. To the photothyristor of each coupler 6, an LED7 for display is connected in series. If the breaking of wire occurs to some sample 1, the corresponding trigger diode 5 turns on, the relay 4 is closed to form a bypass circuit for the faulty sample, the LED7 is turned on to display the faulty sample. |
