| 摘要 |
<p>Metering apparatus with a bank of number wheel indicators has wiper and position contacts to provide an electrical indication of the meter reading. The contacts are scanned in a measurement mode and, in an alternating test mode, test signals are imposed upon the position contacts and the output again scanned. In this way, a contact validation output is generated from which faults such as contact short circuits can be detected by the remote meter reading apparatus.</p> |
