IP Earth Resistivity Meter - Induced Polarization -Electrical Resistivity Tomography

	IP Earth Resistivity Meters

	All our resistivity meters for geoelectric resistivity sounding provide information on the IP (induced polarization) effect of the soil. They do this by measuring the phase shift between the current injected into the ground and the voltage seen at the potential electrodes with high resolution.

	4-Point light hp: a high power, very low cost induced polarization earth resistivity meter in a small package: for Schlumberger soundings to L/2 = 1km; for Mapping, Monitoring, Lab work, Induced Polarization measurements, Archeology

Key Data:
size: 25x12x5cm
weight: 0.75kg batteries included!!
(compare this with:
Terrameter SAS-1000: 5kg,
AGI MiniSting: 6.6kg
MiniRes: 4.3kg - please compare all other specifications!)
frequency 1.08 - 10 Hz, selectable
output current: 100nA..50mA in 8 steps
output voltage: 380 V p-p
resolution 50nV / 24bit
display 4x20 digit LCD
accuracy 0.2%
In-phase/out-of-phase-Display
Probably the only instrument where the output current ranges over more than 5 decades!

AND IT IS FAST: typical data aquistion time is less than 2.5 seconds!

some features:

- fast mapping function for archeology (like GeoScan RM4 / RM15)
- storage capability: > 16.000 data points
- full remote control via the serial interface
- isolated interface / wake up via interface
- 3h fast battery charge
- fully automatic for mapping in archeology and vertical electrical sounding
- determination of the frequency dependency of the app. resistivity
- phase resolution to 50 micro-rad
- determination of the frequency effect
- spectral induced polarization
- fast data aquisition: < 2 sec for 1.04 Hz, 1.2 sec for 8.33 or 10 Hz
- automatic trigger in mapping mode
- full calibration mode for offset, gain and phase
- interface for active electrodes for geoelectric tomography(2-dimensional geoelectric imaging )
- statistics for every sample
- direct rho-s calculation for Wenner, Schlumberger, Schlumberger/2,
Pole-Pole & Dipole-Dipole-arrays
- and more.............. (Download: data sheet, .pdf 180 kB)


	“screenshot” of the results page: for every sounding you get information about apparent resistivity and phase shift - IP - complete with errors, output current, record number and frequency used. The meter next proposes a new AB-spread where you can choose between 6, 10 and 12 intervals per decade.



		4-Point light


	Probably the smallest induced polarization earth resistivity meter on the market with enough power to drive 200m Schlumberger soundings

	Applications: Groundwater prospecting Mining Environment Lab measurements Small scale experimental work

	Key Data: Size: 16x8x5cm Weigh: 500g Frequency: 8.33Hz Output current 100nA...10mA Resolution 100nV Display 4 1/2 Digit LCD Accuracy 0.2% In-Phase/Out-of-Phase Display


	Test results: when compared to the Geotron G41 with 100 watts output power the miniature 4point light easily outperforms the G41. With spreads of more than 30m the G41 results are erratical wheras the 4point light produces stable readings




		4-Point light mC : earth resistivity meter for Vertical Electrical Sounding (VES) & resistivity mapping


	Key Data: Size: 25x12x5cm Weight: 750g Frequency: 4.16 / 5.00 Hz Output current: 100nA...10mA Resolution: 50nV Display: 4x20 Digit LCD Accuracy: 0.2% In-phase/out-of-phase 0/90^o Display in countries with 60Hz line frequency

		Processor controlled, easy to operate high resolution with digital data stacking: better than 50 nV 4x20 characters alpha-numerical LCD-display Simultaneous in-phase / out-of-phase display for induced polarization measurements Fast mapping mode for archeology, capacity > 6.000 Data Points Integral battery charger / battery control Runs on 4 internal AA - NiMH-Cells, exchangeable with AA-alkaline batteries

Applications:

Groundwater prospecting
Mining
Environment


	Lab measurements Small scale experimental work Geoarchaeology



	Test: 4-Punkt light mC versus Syscal R2 up to L/2 =325m (the rhoS-axes of both mesurements were shifted with respect to each other): using just10 mA you get the same results as the much more powerful Syscal


	ActEle - active electrodes for electrical resistivity tomography
	active electrodes for multi-electrode tomgraphy with direct interface for 4point light hp - extremely low price - 85Euros/per electrode INCLUDING cable and stainless steel electrode - simple serial RS232 interface, also perfectly suited for any other resistivity meter with digital readout - maximum number of nodes: 255 - very low power consumption, 2mW/electrode standby, 42mW active - extremely high input impedance due to integrated amplifier: 1GOhm@1Hz - due to this amplifier very low crosstalk between power- and potential lines - ideal for critical conditiones with high contact resistance - simple and cheap replacement of broken cables, even in the field - electrode address is reprogrammable in the field - any number of electrodes possible - can be used to upgrade existing earth resistivity meters to state-of-the-art tomographys systems - FAST: with ActEle and 4point light hp a 600 reading 2D profile can be measured in less than 30 minutes (compare this to the AGIUSA SWIFT/Sting System speed of more than 2 hours for the same profile )






	Multi-electrode systems for geoelectric impedance tomography using multicore cables are produced in cooperation with GEOLOG2000.de Please visit our website there!

	Igor cerovsky /Tuebingen offers some interesting software. Please goto: http://homepages.uni-tuebingen.de/igor.cerovsky/ and see yourself! Software for invervion of resistivity soundings can be found under: http://geophys.geol.msu.ru/ipi2win.htm



	case study: locating a burried steel water pipe using IP no signature in the apparent resistivity signal - strong indication using IP


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IP Earth Resistivity Meters