Field instrument for measurement of AC voltage fluctuations
First Claim
1. A monitor for the determination and display of sag and surge voltage values of an AC power supply comprising:
- voltage input means for receiving an AC input signal from an AC power supply;
an analog/digital converter means coupled to said input means for converting said AC input signal into a binary number;
a digital comparator means coupled to said analog/digital converter for determining the sag and surge values of said AC input signal;
maximum storage means coupled to said digital comparator for storing the binary number value of said surge value;
minimum storage means distinct from said maximum storage means coupled to said digital comparator for storing the binary number value of said sag value;
a digital switch means and timing means coupled between each of said minimum and said maximum storage means and said comparator, for indicating which binary number stored in the maximum storage means and the maximum storage means is to be compared with the binary number stored in said comparator; and
output means coupled to said maximum storage means and to said minimum storage means for displaying sag and surge values.
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Abstract
An apparatus for measuring and displaying the sag and surge voltage values of an AC power supply. Two inputs are attenuated, filtered and the peak difference is converted to a binary number by an analog-to-digital (A/D) converter. A digital comparator compares these conversions with the values stored in a maximum and minimum register. If the output of the A/D is larger than the contents of the maximum register, the previous maximum register'"'"'s contents are replaced by the A/D output. If the output of the A/D is smaller than the contents of the minimum register, the previous minimum register'"'"'s contents are replaced by the A/D output. Dual light emitting diode displays provide a numerical readout of the contents of the maximum and minimum registers.
20 Citations
9 Claims
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1. A monitor for the determination and display of sag and surge voltage values of an AC power supply comprising:
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voltage input means for receiving an AC input signal from an AC power supply; an analog/digital converter means coupled to said input means for converting said AC input signal into a binary number; a digital comparator means coupled to said analog/digital converter for determining the sag and surge values of said AC input signal; maximum storage means coupled to said digital comparator for storing the binary number value of said surge value; minimum storage means distinct from said maximum storage means coupled to said digital comparator for storing the binary number value of said sag value; a digital switch means and timing means coupled between each of said minimum and said maximum storage means and said comparator, for indicating which binary number stored in the maximum storage means and the maximum storage means is to be compared with the binary number stored in said comparator; and output means coupled to said maximum storage means and to said minimum storage means for displaying sag and surge values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A monitor for the determination and display of sag and surge voltage values of an AC power supply comprising:
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voltage input means for receiving an AC input signal from an AC power supply; an analog/digital converter means coupled to said input means for converting said AC input signal into a binary number; a digital comparator means coupled to said analog/digital converter for determining the sag and surge values of said AC input signal; maximum storage means coupled to said digital comparator for storing the binary number value of said surge value; minimum storage means distinct from said maximum storage means coupled to said digital comparator for storing the binary number value of said sag value; means coupled between each of said minimum and said maximum means and said comparator means, for indicating which binary number stored in the maximum storage means and said minimum storage means is to be compared with the binary number stored in said comparator; and output means coupled to said maximum storage means and to said minimum storage means for displaying sag and surge values.
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Specification