6. Conclusion

5.1. Experimental results

Short PICS Specification.

PICS very short specification is given as follows.

PICS operates on frequencies 1.00 and 1.59 kHz.

Capacitance range of measurement (F) 10<sup>19</sup>–10<sup>3</sup>

Inductance range of measurement (H) 10<sup>12</sup>–103

Some results of these tests are shown in Figure 10.

Resistance range of measurement (R) 10<sup>7</sup>

.

–1.0.

Ukraine (Ukrmetrteststandard) and Byalorussia (Center of metrology).

Frequency set discreteness 5 <sup>10</sup><sup>5</sup>

Dissipation factor tgδ (tgφ) 10<sup>6</sup>

Main uncertainty (ppm) 1.0. Sensitivity (ppm) 0.02–0.05

Figure 11. Appearance of the PICS.

Weight (kg) 5

Figure 11.

PICS.

46 Metrology

All results of the theoretical investigations shown earlier were used to develop the comparator

.

.

PICS was tested in USA (NIST) and Russia (VNIIM), in Germany (PTB) and Poland (GUM), in

Appearance of the PICS, together with intermediary thermostated standards, is shown in

–108 . Variational calibration sharply increases the accuracy of measurement. In case of variation correction, for precision measurements, we can use simple and cheap measuring circuits with rather high uncertainty. Variational calibration diminishes the uncertainty of such circuits on thousands or even more times. It does not need too accurate variational standards. Time and space clustering in significant measure overcomes disadvantages of this calibration—increasing the time of measurement. Experimental investigations of the comparator PICS have shown that uncertainty of measurement on main ranges is lower than 10<sup>6</sup> and sensitivity is better than 10<sup>7</sup> –10<sup>8</sup> . Variational calibration also decreases the weight and cost of the accurate equipment.
