US Patent: 5,432,706
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| Multimeter Having Min/max Time Stamp
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Patentees:
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| Glen A. Meldrum (exact or similar names) - Mountlake Terrace, Snohomish County, WA |
| Alan W. McRobert (exact or similar names) - Kirkland, King Count, WA |
| Robert M. Grennberg (exact or similar names) - Marysville, Snohomish County, WA |
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Patent Dates:
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| Applied: |
Jan. 05, 1993 |
| Granted: |
Jul. 11, 1995 |
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Joel Havens
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Description: |
| This is a continuation of application Ser. No. 07/666,354 filed Mar. 8, 1991 and now abandoned.
Abstract:
A min/max time stamp for a multimeter provides display of minimum and maximum measured values recorded since enabling a min/max function. The minimum and maximum values, as well as a present value, may be displayed, together with the relative or absolute time at which the measured minimum or maximum occurred. An alert signal is generated to indicate a new maximum or a new minimum measurement.
Claim:
A measurement device comprising: measurement means for acquiring a signal and for producing a first digital measurement value representative of the signal; microprocessor means receiving said first measurement value from an output of said measurement means, said microprocessor means operating according to a program adapted to compare said first value with a stored second value representative of a maximum and to replace said stored second value with said first value if said first value represents a maximum relative to said second value, said program also being adapted to compare said first value with a stored third value representative of a minimum and to replace said stored third value with said first value if said first value represents a minimum relative to said third value, said program being further adapted to store a fourth value representative of the time at which said first value that replaced said second stored value was acquired by said measurement means, and to store a fifth value representative of the time at which said first value that replaced said third stored value was acquired by said measurement means; and alert means, said alert means being responsive to a signal supplied by said microprocessor means for indicating that said second value has been replaced with said first value and for indicating that said third value has been replaced with said first value, wherein said program is adapted to direct said microprocessor means to supply a signal to said alert means if said second value has been replaced with said first value or if said third value has been replaced with said first value. |
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