| 摘要 |
<p>1. Device for checking the operational state of a fluid meter comprising means (24) for receiving a signal (HF) formed of pulses representing the funtioning of the said meter, and alarm means (30, 52) for producing an alarm signal (AL), characterized in that it includes : means (26) for producing values representing the time intervals tn between two successive pulses of the said signal (HF) in positions N and N + 1 ; means (28) for producing values representing comparison intervals t'n , with t'n = tn (1 + alpha) wherein alpha is a predetermined number between 0 and 1 ; means (30) for comparing on the one hand the values representing the time intervals tn+1, corresponding to the time intervals between two pulses of positions N + 1 and N + 2, and, on the other hand, the comparison intervals t'n' ; the said alarm means (30, 52) producing an alarm signal (AL) if tn+1 is greater than t'n .</p> |
