发明名称 |
SETT OCH REKNARE FOR FREKVENSBESTEMNING |
摘要 |
An averaging frequency counter for determining the frequency of recurrence of input signals has an event counter for counting a number of the input signals, a gate counter for counting a number of time intervals during which the input signals are counted, and a time interval measurement circuit for measuring the cumulative duration of the time intervals. A systematic error associated with the measurement of the duration of each time interval is determined during an application of a calibrated frequency to the averaging frequency counter by dividing a calculated total time error by the number of time intervals. The systematic error is subsequently used to correct a measurement of an unknown frequency during an application of the unknown frequency to the averaging frequency counter by subtracting a product of the number of the time intervals and the systematic error from the cumulative duration. |
申请公布号 |
SE7812973(A) |
申请公布日期 |
1979.06.20 |
申请号 |
SE19780012973 |
申请日期 |
1978.12.18 |
申请人 |
* HEWLETT-PACKARD COMPANY |
发明人 |
J L * SORDEN |
分类号 |
G01R23/10;G01R23/02;(IPC1-7):G01R23/02 |
主分类号 |
G01R23/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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