Open Access
Table 3
Main specifications of the new fabricated capacitance box.
| Item | Value/description |
|---|---|
| Operating power | 12 VDC |
| Operating frequency range | <10 kHz |
| Maximum measuring voltage | 75 VAC (peak) |
| Number of decades/box | 3 decades |
| Number of capacitive elements/decade | 4 capacitors instead of 10 in the old decades |
| Nominal values of the used standard capacitors | 100 nF, 200 nF, 400 nF, 800 nF, 1 μF, 2 μF, 4 μF, 8 μF, 10 μF, 20 μF, 40 μF, and 80 μF |
| Type of the used capacitive components | Silvered mica for (100 nF to 1 μF) and metallized polypropylene sulfide for >1 μF |
| Number of capacitance steps/decade | 15 instead of 10 in the old decades |
| Capacitance steps of each decade | 100 nF for the first decade, 1 μF for the second decade, and 10 μF for the third decade |
| Whole output capacitance range | 100 nF to 150 μF |
| Maximum setting value | 166.5 μF |
| Maximum possible output capacitance steps | 4096 instead of 1331 in the old corresponding box |
| Maximum different output capacitance steps | 1666 instead of 1111 in the old corresponding box |
| Operating temperature and humidity | 10 °C to 40 °C; <80% RH |
| Storage temperature | −20 °C to 65 °C |
| Basic test conditions | 1 kHz, 1 V rms, 23 °C |
| Temperature coefficient | 10 to 25 ppm/°C, depending on the capacitance value |
| Dissipation factor | 85–400 ppm depending on the capacitance value |
| Relative deviation of the output capacitance steps | ±5 × 10−5 to ±5 × 10−4 |
| Estimated stability over one year | 80–120 ppm/year, depending on the capacitance value |
| Relative voltage dependence | ±1×10−6/V |
| Measurements repeatability | In the order of 1 ppm, depending on the measured capacitance value |
| Relative uncertainty due to the combination effect | <15 ppm, on the average |
| Box size | 20.5 cm × 12.5 cm × 10.5 cm for control unit and 32.5 cm × 27.5 cm × 10.5 cm for the unit of the standards |
| Mass | <4.7 kg |
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