CTM-DI type magnetometerDetailed product description：

The CTM-DI magnetometer consists of two main parts: a non-magnetic theodolite and a flux gate detection system. A non-magnetic theodolite is highly non-magnetic, sufficient to ensure the observation accuracy of D and I, which is its essential difference from ordinary theodolites. The flux gate detection system is an electronic detection system with high sensitivity and stability, and its sensor is placed on the telescope of the non-magnetic theodolite. By using a high-precision angle measurement system with a non-magnetic theodolite, the magnetic declination D and geomagnetic inclination I can be accurately measured according to a certain observation procedure.

Main technical specifications of CTM-DI magnetometer

Baseline observation standard deviation: σ DB ≤± 0.10 ′, σ IB ≤± 0.10 ′
Observation accuracy: Δ D ≤ 0.20 ′, Δ I ≤ 0.20 ′
Steering difference: Δ D, Δ I<10 ′
The maximum difference between the baseline value and the average value in three directions: Δ D, Δ I ≤ 0.20 ′
The standard deviation of the horizontal direction measured by the non-magnetic theodolite (indoor) is ≤± 4 ″
Magnetic susceptibility display of the whole machine (before installing the probe); ≤2×10 -6 
Zero field offset: ± 1nT
Temperature coefficient of zero field offset: 0.01nT/℃
System noise: ≤ 0.2nT (pp)
Maximum resolution: 0.1nT
Dynamic range: Two levels × 10 ± 1999nT × 1 ± 199.9nT
Working temperature range: -10 ℃ to 40 ℃
Power supply: AC/DC dual-use, DC 12V or AC 220V
Minimum safe distance from monitor to sensor: 2.0m