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Constant voltage accuracy
In power equipment and similar devices, this refers to the stability of the output voltage when factors such as input voltage or output current are varied. It is expressed as the amount of variation in the output voltage or as the percentage of variation relative to the rated output voltage. There are several types of constant voltage accuracy, mainly indicating the amount of variation in output voltage when the following conditions are changed within specified ranges.
| Static Input Variation | The amount of variation when input voltage is gradually changed |
|---|---|
| Dynamic Input Variation | The amount of variation when input voltage is changed rapidly |
| Static Load Variation | The amount of variation when load current is gradually changed |
| Dynamic Load Variation | The amount of variation when load current is changed rapidly |
| Ambient Temperature Variation | The amount of variation when the ambient temperature of the device is changed |
| Initial Drift | The amount of variation during the time from power-up until the operating temperature is reached (typically after 30 minutes) |
| Time Drift | The amount of variation from the time the operating temperature is reached (typically after 30 minutes) until the specified time has passed (8 hours later) |
For example, for devices used in environments with significant temperature changes, it is desirable to select those with superior constant voltage accuracy in terms of ambient temperature variation, or to choose devices with excellent constant voltage accuracy according to the operating conditions.