Table 2 Frequency characteristics of MGF
± 8000 nT range | ± 60,000 nT range | |||||
|---|---|---|---|---|---|---|
X | Y | Z | X | Y | Z | |
Analog part | ||||||
Noise density @ 1 Hz (\({\text{pT}}/\sqrt {\text{Hz}}\)) | 8.9 | 9.5 | 10.1 | 8.4 | 8.7 | 7.7 |
Noise RMS in 0.1–10 Hz (pT) | 36.6 | 34.5 | 39.7 | 33.1 | 34.1 | 32.2 |
Cutoff (Hz) | 275 | 213 | 275 | 326 | 326 | 326 |
Time delay @ 1 Hz (msec) | 0.889 | 1.109 | 0.924 | 0.426 | 0.438 | 0.423 |
Error in 1–107 Hz (μsec) | < 35 | < 20 | ||||
Digital part | ||||||
Cutoff (Hz) | ||||||
256 Hz sampling | 103.5 | |||||
128 Hz sampling | 55 | |||||
64 Hz sampling | 28 | |||||
32 Hz sampling | 14 | |||||