Data logging apparatus
First Claim
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1. Apparatus for real-time stamping data in data logging applications, the apparatus comprising:
- a) a reference time base;
b) short stopwatch means for generating from the reference time base a short-time stamp;
c) means for combining data to be logged with said short-time stamp;
d) means for storing the data and the short-time stamp;
e) a long stopwatch means connected to said short stopwatch means for generating at intervals a long-time stamp; and
f) a controller circuit for controlling the storage of the data and of the long-time and short-time stamps, the controller circuit being operative to store said long-time stamp at predetermined intervals.
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Abstract
In data logging applications an apparatus for real-time stamping data includes a reference time base, a short stopwatch circuit operative for generating a short-time stamp, and a long stopwatch circuit operative for generating at intervals a long-time stamp. Data to be logged with the short-time stamp is combined therewith and stored. A controller circuit controls the storage of the data and of the long-time and the short-time stamps. The controller circuit stores the long-time stamp at predetermined intervals.
28 Citations
5 Claims
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1. Apparatus for real-time stamping data in data logging applications, the apparatus comprising:
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a) a reference time base; b) short stopwatch means for generating from the reference time base a short-time stamp; c) means for combining data to be logged with said short-time stamp; d) means for storing the data and the short-time stamp; e) a long stopwatch means connected to said short stopwatch means for generating at intervals a long-time stamp; and f) a controller circuit for controlling the storage of the data and of the long-time and short-time stamps, the controller circuit being operative to store said long-time stamp at predetermined intervals. - View Dependent Claims (2)
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3. Apparatus for real-time stamping data in data logging applications and comprising:
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a) synchronous counter for counting to a predetermined value in response to a reference time base; b) short stopwatch circuit means responsive to a selected number of the least significant output bits of said synchronous counter to generate a short stopwatch time; c) long stopwatch circuit means connected to said short stopwatch circuit means by a carry line to generate a long stopwatch time; d) control means for detecting when the interval between data to be stored is greater than the capacity of said counter; and e) means for storing the long stopwatch time in response to said control means. - View Dependent Claims (4, 5)
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Specification