| 摘要 |
A programmable multi-channel load profile recorder includes a plurality of memory-based tables, such as a load profile configuration table, a plurality of channel and display configuration tables and an operations table, which can be updated when the recorder is reprogrammed in the field to record additional channels of metering quantities or reconfigured with new formulas. The load profile configuration table containing entries therein for each of a plurality of user-selected metering quantities to be recorded. The plurality of channel and display configuration tables contain parameter data and the operations table contains pointers therein to respective memory-based operation modules, each of which contains executable instructions therein. The metering quantities can be quantities such as watt-hours (Wh), var-hours (Vh), volt-ampere-hours (VAh), volt2-hours (V2h), ampere2-hours (A2h) and power factor (PF) as well as other user-selected quantities. According to a preferred aspect of the present invention, each of the tables and modules can be readily updated based on externally supplied data at the time the recorder is programmed. Thus, the recorder need not contain built-in data for determining all the possible channel combinations which might be selected by a user, or fixed formulas for determining all possible metering quantities. The display configuration tables are also provided in memory so that displayable quantities such as RMS line voltage (Vrms) can be displayed by the recorder, even if such quantity is not one of the above-described metering quantities.
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