The Ohmega is a high quality earth resistance meter capable of accurate measurements covering a wide range of applications.

Traditionally, high power was thought to be necessary for successful surveys. However, it is now accepted that the superior precision of the Ohmega enables accurate electrical measurements to be made in all but the most extreme environments, nominally down to depths of 700 meters. A choice of current settings from 0.5mA to 200mA, with automatic gain steps, enables measurements to be made between 400 Kohm and 0.001 ohm.

Three square wave frequencies are available with a choice of up to 16 cycles per measurement. Self potential can also be monitored.

The Ohmega will deliver up to 200mA making this a most powerful yet lightweight tool for sounding applications.

The Ohmega is supplied with four sounding cables on hand reels, and four stainless steel electrodes.

A charger capable of working from 115 and 230 v is included.

Tigre offers flexibility, with increased power now a standard feature with 32, 64 or 128 electrodes options supplied within a single instrument case.

The Tigre is a high quality earth resistance meter capable of accurate measurements covering a wide range of applications. Traditionally, high power was thought to be necessary for successful surveys.

However, it is now accepted that the superior precision of the

Tigre enables accurate electrical measurements to be made in all but the most extreme environments, nominally down to depths of 700 meters.

A choice of current settings from 0.5mA to 200mA, with automatic gain steps, enables measurements to be made between 400 Kohm and 0.001 ohm. Three square wave frequencies are available with a choice of up to 16 cycles per measurement. Self potential can be monitored while various checks on instrument performance are incorporated into control software.

The Tigre can be used for soundings and profiling in the traditional way using single-core cables; however, with the selection of suitable automation options, complex electrical images, such as shown below, can be collected by a single operator and viewed in the field, real time, by way of our ImagerPro 2000 XL acquisition software. ImagerPro 2000 XL is a Windows data collection program producing real time pseudosections of apparent resistivity values offering the operator a fast visual QC facility.

ImagerPro 2000 XL allows the operator a quick method for setting survey parameters prior to data collection.

Because the Tigre is so versatile, it can be used in a

variety of applications including:

• Pollution Plume mapping.

• Groundwater Exploration

• Geotechnical Studies

• Archaeology

• Mineral exploration

• Geological Mapping

• Civil Engineering

Although the Tigre can be used in the traditional manner to

measure ground resistivity, its capabilities and performance can

be enhanced in a number of ways.

Control of the basic instrument can be transferred to a fled computer using the provided RS232 cable, allowing instrument settings to be selected and altered from the keyboard.

The received signal can be viewed and both the square wave periodicity and the fraction of the ON times of the sampled signal varied to optimize the qualityof measurement. Data is stored on the hard drive of your PC, making it unnecessary to use a field notebook. These options are available as part of the standard Tigre package. If automatic data collection for electrical imaging or sounding is required, a variety of cables are available to expand the Tigre to 128 electrodes.

For groundwater projects or applications requiring depth estimates to be made, Offset Sounding cable systems are ideal, offering the user a choice of Wenner or Schlumberger confgurations. When lateral as well as vertical discrimination is required, profiling to a depth of 150 metres can be carried out using Imager cables. The use of these multicore cables,

with equally spaced electrodes, is a survey technique called electrical imaging (tomography), recently developed for the investigation of areas of complex geology, particularly mineral, groundwater and engineering applications.

The Tigre is supplied with ImagerPro 2000 XL, our Windows

acquisition software package. A 32-bit product, ImagerPro

is designed to run under Windows 98, 2000 or XP.

Its user friendly interface requires little previous computer

experience and the program can easily be used in conjunction

with other processing software such as RES2DINV and

RES3DINV, also available from Allied. We also offers a range

of bespoke cable assemblies, to meet operational requirements

with fxed or variable spacings, offset sounding

cables, borehole and marine cables.

Details available on request.

• Electrode capacity: 32 to 256 (optional)

• Output current: 0.5 - 200mA

• Output Voltage: 360V peak to peak.

• Cycle time: 2.1, 4.2 & 8.4 sec. (sounding)

• No. of cycles: 1, 2, 4, & 16 (sounding)

• Input impedance: 22 MOhms

• Measurement range: 0.001 - 400 kOhms

• Power supply: Internal rechargeable 12v DC or

external 12 v source.

7 Amp/h @ 12v DC

• Display: 80 character alphanumeric LCD.

• Weight: 6kg.

• Dimensions: 335 X 235 X 300mm