| 摘要 |
<p>A water pump (1) to be tested is arranged to pump water (3) from a sump (2). The electric power supplied to the pump (1) is measured by an electric current transducer (6), and the output pressure of the pump is measured by a pressure transducer (9). The output voltages from the transducers are fed to voltage-to-frequency converters (8, 11) whose respective outputs are fed to counters (12, 13) controlled by a clock (14). The number of pulses in the respective frequency signals occurring within a predetermined time is counted and stored on a data storage card (16). During subsequent processing of the data stored on the card (16), the rate of water flow through the pump is determined by sensing the time of energising and de-energising of the pump, since this occurs at the time at which two respective water levels are reached by means of water-level sensors (4, 5). From this, the pumping efficiency of the water pump can be obtained.</p> |
