Open Access
Table 4
Comparison between the previous CB and the new CB.
| Item | Previous CB | New fabricated CB |
|---|---|---|
| No. of decades/box | 2 | 3 |
| No. of microcontrollers/box | One microcontroller/decade | Only one for the whole box |
| Type of the used capacitive components | Tantalum | Silvered mica and metallized polypropylene sulfide |
| No. of capacitive elements/decade | 4 | 4 |
| Nominal capacitance values | C, 2C, 3C and 4C | C, 2C, 4C and 8C |
| No. of capacitance steps/decade | 10 | 15 |
| Range | 100 nF to 10 μF | 100 nF to 150 μF |
| Maximum setting value | 11 μF | 166.5 μF |
| Maximum different output capacitance steps | 100 | 1666 |
| Relative deviation of the output steps | ±2 × 10−4 to ±2 × 10−3 | ±5 × 10−5 to ±5 × 10−4 |
| Measurements repeatability | About 27 ppm | About 1 ppm |
| Maximum measuring voltage | 50 VAC | 75 VAC |
| Temperature coefficient | 1000 ppm/°C | 10–25 ppm/°C |
| Automatic calibrations | Can be used | Can be also used |
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