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The electrometer correction factor (Pelec) obtained from the measurement and calibration data.
| Measurements | Calibration data | ||||
|---|---|---|---|---|---|
| Electrometer | Range | P elec [nC/rdg] | Standard deviation [%] | P elec [nC/rdg] |
Uncertainty (k = 2) [%] |
| RT521R | – | 1.0000 | ±0.02 | 0.9998 | 0.16 |
| Model 35040 | – | 0.9992 | ±0.01 | 0.9993 | 0.20 |
| RAMTEC Duo | L | 1.0014 | ±0.06 | 1.0009 | 0.15 |
| M | 0.9999 | ±0.01 | 1.0002 | 0.15 | |
| UNIDOS‐E | L | 0.9994 | ±0.02 | – | – |
| M | 0.9996 | ±0.02 | – | – | |
