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Consider a regulated voltage output, which needs to be checked. Three dc digital...
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Consider a regulated voltage output, which needs to be checked. Three dc digital bench voltmeters (DVM) are available (red DVM-1, green DVM-2, and blue DVM-3). Find which one provides the best measurement uncertainty, i.e. in the reading result , and provide the value of the uncertainty found only for that DVM.
The first DVM provided the reading , whereas the second shown , and finally, the third gave .
The accuracy performance is summarized below.
| DVM-1 | DVM-2 | DVM-3 | |||
| display: 3 | display: 3 | display: 3 | |||
| range | accuracy | range | accuracy | range | accuracy |
| 400 mV | 0.5 % + 4 LSD | 500 mV | 0.6 % + 5 LSD | 600 mV | 0.1 % + 5 LSD |
| 4 V | 0.6 % + 4 LSD | 5 V | 0.7 % + 5 LSD | 6 V | 0.3 % + 4 LSD |
| 40 V | 0.7 % + 2 LSD | 50 V | 0.7 % + 4 LSD | 60 V | 0.3 % + 3 LSD |