MAIN TECHNICAL PARAMETERS(技术参数) | |
Frequency band of received signals(信号频率范围) | 0.01 ... 30 Hz |
Transformation coefficient (传输系数): | 20 mV/nT; |
Transformation coefficient error(传输系数误差) | <=3 dB |
Noise rejection on (50 ± 0.2) and (60 ± 0.2) Hz(噪音抑制) | >60 dB |
ADC (CAM unit) resolution(A/D转换) | 24 bit |
Power supply voltage(电源) | ± (12 ± 0.2) V |
Total power consumption(总功耗) | < 3 W |
Temperature range of operation(工作温度) | -10 + 50oC |
Outer dimensions(探头尺寸) | 长度= 900 mm; 直径= 95 mm |
Weight of one sensor(探头重量) | 6.5 kg |
Maximum length of connecting cable (电缆长度) | 200 m |
GPS sampling synchronization and coordinates determination(GPS同步和定位) |
LEMI-30主要用于观测超低频地磁场,它由三根感应式磁探头和一个记录单元(CAM)组成。记录单元可与电脑连接。该仪器最适合于测量30-0.01 Hz频率范围的信号,常用于地震前兆磁场异常的监测。另外,该设备可作为任何数字记录设备的模拟信号的输出单元。