The Syscal Terra Switch is the new generation of resistivity & IP surveying system. It mixes recent electronics advances with the standards of resistivitymeters designed by IRIS Instruments for more than 30 years such as robustness, compactness, light weight and large temperature range (-20 °C to +70 °C).
The transmitter part has been redisigned for a better cooling and improved performed in hot context. While the receiver part has been completely redisgned to offer an outstanding accuracy together with 20 channels making this system the most efficient of the market.
Although completely redesign, the Syscal Terra transmitter specifications are unchaged (250 W, 2000 Vpp) to keep the compatibility with your existing cables and Switch Pro unit (10 channels only). It allows to perform a large type of acquisition (SP, resistivity, IP for sounding, profiling, 2D, 3D, roll-along and 4D surveys)
The color screen allows the user to check the apparent resistivity in real time, to visualize simultaneously the 20 IP decay curves and to make it easier the quality control after acquisition. The touchable screen improves the experience of navigation through the menus, allowing also to type directly the filename on a virtual keyboard.
The measurements are stored in a single datafile and downloaded using a USB key, a laptop connected through a USB cable or any WiFi device featuring a web explorer (any smartphone, tablet or laptop).
The Syscal Terra box features an independant module containing 4 x 96 W.h Li-ions batteries. This part can be easily opened, allowing the user to remove easily the internal batteries to simplify the shipping. The internal Li-ions batteries are totally optional as the system can operate with external batteries. A flat bottom plate is provided with the system to replace the battery module and save wiehgt and volume. The 4 x 96 W.h batteries can travel easily with you as cabin luggages according to IATA regulation. Each battery weighs 450 g and replaces a 2.6 kg standard 12 V lead-acid battery of equivalent capacity.
The Syscal Terra firmware can be updated by yourself from a laptop and a dedicated software (IRIS Updater) that search for the last firmware available automatically. The user will thus have access to new developments and improvements throughout the entire life of the device, free of charge.
The device is sold with small standard testing accessories and features a self-diagnostic menu for the complete testing of the device (testing of transmitter, receiver and switch boards, external battery capacity and cables contintuity). An additional accessory can be sold to test the cable electrical insulation. Diagnostic report files are automatically generated and can be inserted in the report to prove the proper functionning of the system.

The Syscal Terra remains compact and is the only one in the market (with the Syscal Pro) to fit in one unique box for up to 120 electrodes. Moreover it offers a unique scalability with the exclusive possibility to use two Syscal Terra (or more) in master-slave mode, allowing to combine for example 2 Syscal Terra Switch 48 to get a Syscal Terra 96.
The scalability is even more developped with the unique possibility to use several systems in network (not connected together) working synchroneously on the same sequence and allowing for the first time to measure under roads for example without impacting traffic. The multi-Syscal mode is based on the synchronization of the different units on the GPS-PPS clock.
This mode can be complexified again by creating sequences for which different Syscal are injecting at the same time (multi-Tx). This very new and unique feature allows to perform high resolution 3D survey in a record time without any communication between the different units. This specific data can be processed thanks to ERTLab Studio software.
The Syscal Terra can records the current and voltage timeseries in background (optional). It allows if necessary to visualize and to reprocess your dataset a posteriori on a laptop with a free dedicated software (FullWave Viewer 2) using advanced algorithms. In the following dataset, you can see how FullWave Viewer 2 is able to correct for electrode polarization effect (level 2 of the pseudo-section).

Several options and accessories are also directly provided with the Syscal Terra such as: - the monitoring mode allowing to program your device to wake up and acquire at specific date. The system has also been tought for long term monitoring with the possibility to send data on a FTP server. - the Rx only option to use the Syscal as a simple receiver with an external transmitter (e.g. TIP, TIPIX) - the 1200W external power converter - the dynamic option for land and river/marine continuous surveys - the borehole cables to realize a simple diagraphy, a surface to borehole tomography or a transmission tomographyRead more information in the brochure.