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LONG-PERIOD MAGNETOTELLURIC STATION(MTS) LEMI-417

LEMI-417 长周期大地电磁仪    

417
               Main features(主要性能)

High resolution and accuracy(高分辨、高精度

Low noise(低噪声)
3 electric + 3 magnetic channels(三电道+三磁道)
Very low temporal and thermal drift(低漂移)
Low power consumption(低功耗)
512 MB internal memory(内存512MB,可变)
Satellite synchronization(卫星同步)
4-lines digital display(面板4行数字显示)
Analog and RS - 232 outputs(模拟和RS-232输)
Magnetic sensor with leveling facilities(水平调整)

LEMI-417是专门为大地电磁测深观测而设计的.它由三部分组成:主机、三分量磁通门磁力仪、配对电极、主机.输入六通道(三个磁分量+三个电分量)。其最大优点是磁通门磁力仪和特别配对的专用电极具有极高的稳定性、低漂移和高精度,这一特点使它适合于长周期探测;其次,其体积小、重量轻、功耗低,特别适合于流动台站和复杂地区使用。第三,记录数据被自动储存于CF卡上,并可同时输出到电脑进行监测。CF卡可取出在室内用读卡器快速读取数据,而不必采用传输线的方式在现场传输数据。第四,GPS同步可使多台仪器进行同步阵列观测。


MAIN TECHNICAL PARAMETERS(主要技术指标)

Magnetic variations measuring ranges along each component(磁场测量范围)
±68000 nT
Resolution(磁场分辨率) 
10 pT
Noise level at (0.03 - 0.3) Hz frequency band 频率在0.03-0.3Hz之间的噪音水平
< 15 pT rms
Long-term zero drift(长期零漂移)
< ± 5 nT/year
Temperature drift(温度漂移) 
<0.2 nT/°C
Transformation factor linearity error(传输函数线性误差)
< 0.01%
Components orthogonality error(三分量方位正交误差)
< 30 min of arc
lectric voltage total measurement range (电位测量范围)
±600 mV
Resolution (电场分辨率)
0.07 µV
Input resistance (输入阻抗)
10 GOhm
Sample rate(采样率)
1 per s
Samples  averaging (by PC software) 平均采样率 2, 5, 10, 15, 20, 30, 60
Internal FLASH-memory volume(内置闪存)
2G
Operating temperature range(工作温度)
-40 — +50°C
Power consumption(功耗)  
< 1.2 W
Power supply source(电源)
12 V
Weight of electronic unit with magnetic sensor(总重量)
 2.7 kg
Length of connecting cable between magnetic sensor and electronic unit up to(磁电缆)
10 m  
Length of connecting cable between GPS antenna and electronic unit 3m


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