Triaxial Fluxgate Magnetometer

A four-range, triaxial fluxgate magnetometer mounted on a 1.52-m boom, was used to measure the ambient magnetic field.
The three axes were sampled sequentially three times each 5.72 s. Sensitivities and accuracies of the four ranges were plus or
minus 150 and 1.2, 450 and 3.5, 1,500 and 11.7, and 25,000 and 195.3 nT, respectively. The sensitivity was switched by ground
command. Frequency response was dc to 1 Hz (flat); down 3 dB at 10 Hz; then falling at 6 dB per octave at higher frequencies.
Satellite stray fields were constrained to be less than 0.1 nT, which was also the rms instrument noise level. Inflight
calibration was performed once every 98 min.

采用了一款安装在1.52米长杆上的四范围三轴霍尔效应磁力计，用以测量环境磁场。三个轴依次进行三次5.72秒的采样。四个范围的灵敏度与精度分别为±150和1.2nT、±450和3.5nT、±1500和11.7nT以及±25000和195.3nT。灵敏度通过地面指令进行切换。频率响应范围为直流至1Hz（平坦响应）；在10Hz处下降3dB；随后在更高频率下以每倍频程6dB的速率下降。卫星散乱磁场被限制在小于0.1nT，该值也等同于仪器的均方根噪声水平。飞行校准每98分钟进行一次。