| 摘要 |
<p>An apparatus for testing a metal detector is incorporated in a combination weighing system where the metal detector is located to monitor product as it passes through a discharge chute of the combination weighing machine into a package. The apparatus includes a computer programmable by an operator to initiate a metal detector test operation. Upon such initiation, the computer holds out a first one of the scales from one or more subsequent combination searches while a metal test object is deposited in a first scale. Then the computer performs a combination search of the scales to select a test combination which includes the first scale and other scales as needed to achieve the target weight, discharges the selected combination and monitors the output of the metal detector to determine if it is working. Related methods are also disclosed. A feed mechanism is optionally provided to automatically deposit a test object in the first scale in which case, the computer is programmed to periodically activate the feed mechanism and initiate a metal detector test operation.</p> |
