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Constant voltage accuracy
In power supply equipment and similar devices, this indicates the stability of the output voltage when the input voltage or output current is varied. It is expressed either as the amount of fluctuation in the output voltage or as the ratio of that fluctuation to the rated output voltage. There are several types of voltage regulation accuracy, mainly indicating the fluctuation value of the output voltage when the following conditions are varied within specified ranges.
| Static line regulation | Fluctuation value when the input voltage is changed gradually |
|---|---|
| Dynamic line regulation | Fluctuation value when the input voltage is changed rapidly |
| Static load regulation | Fluctuation value when the load current is changed gradually |
| Dynamic load regulation | Fluctuation value when the load current is changed rapidly |
| Ambient temperature variation | Fluctuation value when the ambient temperature around the equipment is changed |
| Initial drift | Fluctuation value from power-on until reaching operating temperature (typically after 30 minutes) |
| Long-term drift | Fluctuation value from reaching operating temperature after power-on (typically after 30 minutes) to a specified time later (8 hours) |
For example, for equipment used in environments with severe temperature changes, it is desirable to select products with excellent voltage regulation accuracy for ambient temperature variation, choosing devices with superior voltage regulation accuracy suited to the operating conditions.