Schwab Research Technology - Lippmann Geophysical Instruments (LGM)) products

Our high resolution earth resistivity meter 4point light 10W provides quantitative information about induced polarity (IP) of the soil. It measures the phase shift between the current injected into the ground and the voltage seen at the potential electrodes. It has adequate power to drive Schlumberger soundings up to L/2 = 1000 m.

For electrical resistivity tomography we offer a chain of active electrodes (ActEle). ActEle is developed especially for connection to the earth resistivity meter 4point light 10W. It is used for multielectrode measurements. By default the electrode chain consists of 20 electrodes at a distance of 5 metres. Other distances (0.2 - 10 m) are available on request. The chain is extendable up to 255 electrodes.

ActEle8/16/24 switchboxes are switchboxes for multielectrodes with 8, 16 or 24 channels. Compatible with the ActEle system. 8, 16 or 24 channels per box, size: 120 x 80 x 55 mm. For monitoring measurements.

Although the power output of SYSCAL R2 far exceeds the power output of the 4point light mC, the results are almost identical. In order to ensure comparability the rho-s-axes of both mesurements were shifted with respect to each other. L/2 =325 m.

The earth resistivity meter 4point light hp is a geoelectrical instrument to determine induced polarization (IP) with adequate power to drive Schlumberger soundings up to L/2 = 1000 m.

4point light was probably the smallest induced polarization earth resistivity meter on the market. It has adequate power to drive Schlumberger soundings up to L/2 = 200 m.

84 x 62 x 123 mm. Resolution ‹ 1nrad. Integrated 24 bit ADC with data logger. RS232 or RS485 interface. Integrated sensors for temperature / pressure / humidity.

51 x 45 x 64 mm, Resolution: appr. 1 nrad.

2-Channel tiltmeter module. Diameter : 40 mm. Stainless steel borehole probe. Outside Diameter : 50 mm. Length : appr. 600 mm. Resolution : appr. 1 nrad. Integrated high resolution temperature sensor.

Signal source: A person in the first floor of a building moves back and forth in a room. The sensor was installed in the cellar below. Result: A 70 nrad input signal is clearly resolved with high signal-to-noise ratio.