Table of Percentage Error and Decibel Relationships
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Table of Percentage Error and Decibel Relationships (for Voltage and Current)
| Error (± percent) | Error (dB) | Error (dB, relative to ideal value) | |
| 0.01% | +0.00087 | -0.00087 | -80.00 |
| 0.02 | +0.00174 | -0.00174 | -73.98 |
| 0.03 | +0.00261 | -0.00261 | -70.46 |
| 0.04 | +0.00347 | -0.00348 | -67.96 |
| 0.05 | +0.00434 | -0.00434 | -66.02 |
| 0.06 | +0.00521 | -0.00521 | -64.44 |
| 0.07 | +0.00608 | -0.00608 | -63.10 |
| 0.08 | +0.00695 | -0.00695 | -61.94 |
| 0.09 | +0.00781 | -0.00782 | -60.92 |
| 0.10 | +0.00868 | -0.00869 | -60.00 |
| 0.20 | +0.0174 | -0.0174 | -53.98 |
| 0.30 | +0.0260 | -0.0261 | -50.46 |
| 0.40 | +0.0347 | -0.0348 | -47.96 |
| 0.50 | +0.0433 | -0.0435 | -46.02 |
| 0.60 | +0.0520 | -0.0523 | -44.44 |
| 0.70 | +0.0606 | -0.0610 | -43.10 |
| 0.80 | +0.0692 | -0.0698 | -41.94 |
| 0.90 | +0.0778 | -0.0785 | -40.92 |
| 1.00 | +0.0864 | -0.0873 | -40.00 |
| 2.00 | +0.172 | -0.175 | -33.98 |
| 3.00 | +0.257 | -0.265 | -30.46 |
| 4.00 | +0.341 | -0.355 | -27.96 |
| 5.00 | +0.424 | -0.446 | -26.02 |
| 6.00 | +0.506 | -0.537 | -24.44 |
| 7.00 | +0.588 | -0.630 | -23.10 |
| 8.00 | +0.668 | -0.724 | -21.94 |
| 9.00 | +0.749 | -0.819 | -20.92 |
| Appendix B |  | | |
| 10.00 | +0.828 | -0.915 | -20.00 |
| 15.00 | +1.214 | -1.412 | -16.48 |
| 20.00 | +1.584 | -1.938 | -13.98 |
| 25.00 | +1.938 | -2.499 | -12.04 |
| 30.00 | +2.279 | -3.098 | -10.46 |
| 35.00 | +2.607 | -3.742 | -9.12 |
| 40.00 | +2.923 | -4.437 | -7.96 |
| 45.00 | +3.227 | -5.193 | -6.94 |
| 50.00 | +3.522 | -6.021 | -6.02 |
This table is valid for both voltage and current values. For power calculations, the dB values must be multiplied by 1/2.
If a particular instrument reading is thought of as consisting of two parts, the ideal value and the error in the reading, then
reading = ideal value + error
The error (%) value is the error expressed as a percentage of the ideal value
A reading with a 1 percent error will be off by +0.0864 dB or -0.0873 dB, depending on the direction of the error. The error is —40 dB relative to the ideal value.
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