Test operation of electronic demand register
DCFirst Claim
1. Apparatus for providing an operating mode and a test mode for an electronic demand register of an electric meter, said electronic demand register including a digital processor of the type having a volatile memory, comprising:
- means for non-volatile storage of at least a maximum demand, a remainder of a demand time period and a plurality of programmed contants upon entering said test mode;
means for retaining at least said programmed constants in said volatile memory upon entering said test mode whereby said digital processor is enabled to use said programmed constants during said test mode;
means for presetting a demand time period and at least one of a demand accumulator and a maximum demand storage for initiation of a test; and
means for erasing said demand accumulator and said maximum demand storage and for restoring said maximum demand, said remainder of a demand time period and said programmed constants stored in non-volatile memory into said volatile memory upon entering said operating mode from said test mode whereby demand metering resumes from zero accumulated demand for said remainder of said demand time period before beginning to accumulate a demand over a full demand time period.
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Abstract
An electronic demand register performs rolling demand metering in which a demand interval is divided into N subintervals. At the end of each subinterval, the demand data from the just-completed subinterval is summed with the demand in the most-recent N-1 contiguous subintervals to derive an interval demand. A test operation is provided in which the stored maximum demand, a number representing the remainder of the subinterval interrupted by the test and programmed constants are stored in non-volatile memory but are also retained in the processor for use during test. A test reset switch resets accumulated demand data and presets the subinterval timer to predetermined values from which they may be operated by a calibrated test load to confirm the performance of the demand register. At the end of testing, all data in the processor is zeroed and the data stored in non-volatile memory is restored. Demand metering is resumed starting with the remainder of the interrupted subinterval and with the demand from the N-1 prior subintervals set to zero.
19 Citations
7 Claims
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1. Apparatus for providing an operating mode and a test mode for an electronic demand register of an electric meter, said electronic demand register including a digital processor of the type having a volatile memory, comprising:
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means for non-volatile storage of at least a maximum demand, a remainder of a demand time period and a plurality of programmed contants upon entering said test mode; means for retaining at least said programmed constants in said volatile memory upon entering said test mode whereby said digital processor is enabled to use said programmed constants during said test mode; means for presetting a demand time period and at least one of a demand accumulator and a maximum demand storage for initiation of a test; and means for erasing said demand accumulator and said maximum demand storage and for restoring said maximum demand, said remainder of a demand time period and said programmed constants stored in non-volatile memory into said volatile memory upon entering said operating mode from said test mode whereby demand metering resumes from zero accumulated demand for said remainder of said demand time period before beginning to accumulate a demand over a full demand time period. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for providing an operating mode and a test mode for an electronic demand register of an electric meter, said electronic demand register including a digital processor of the type having a volatile memory, comprising:
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storaging at least a maximum demand, a remainder of a demand time period and a plurality of programmed constants in a non-volatile memory upon entering said test mode; retaining at least said programmed constants in said volatile memory upon entering said test mode whereby said digital processor is enabled to use said programmed constants during said test mode; presetting a demand time period and at least one of a demand accumulator and a maximum demand storage for initiation of a test; and erasing said demand accumulator and said maximum demand storage and restoring said maximum demand, said remainder of a demand time period and said programmed constants stored in non-volatile memory into said volatile memory upon entering said operating mode from said test mode whereby demand metering resumes from zero accumulated demand for said remainder of said demand time period before beginning to accumulate a demand over a full demand time period.
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Specification