Quick Start Guide

A.  Prepare the batteries

• Charge batteries using the supplied GroundTEM battery charger;
• Guidance notes in the lid provide information on checking battery status;
• No external adapter is required for the battery charger, just an “off-the-shelf” power lead;
• When charged, install the batteries into the GroundTEM unit.
• No external batteries are required with the GroundTEM i-Series instruments.

A.  Lay out the transmitter loop

• The loop has a lead-in / lead-out added to each end, so start at the instrument and pull wire off the reel until the first double-marker is found: this will be the bottom-left corner of the loop;
• The TX loop can be laid out in a clockwise or anti-clockwise direction, so walk in a straight line until the first single marker (20m loop) or double marker (40m loop) is found: this is the next corner of the loop;
• Turn 90 degrees and walk again, laying the next side of the square: tapes, a compass, or optical square can be used to help make the loop square – it does not need to be a perfect square to perform acceptably;
• Use the other black markers on the loop as a guide for the remaining corner positions – these markers differ depending on loop size (see figure);
• A final double marker should coincide with returning to the bottom-left corner of the transmitter loop;
• The remaining wire on the drum is the lead-out back to the instrument.

B.  Lay out the receiver coil

• The receiver coil is relatively simple to locate centrally;
• On the lead-in cable, the first double marker should be held at the bottom-left corner of the TX loop;
• Now walk towards the top-right corner of the TX loop and the end of the lead-in cable will coincide with the bottom left corner of the receiver coil;
• Use the yellow markers on the receiver coil cable as guides for the corners and layout in a square roughly parallel with the TX loop;
• Before making any connections, ensure connectors are clean and dry;
• Plug the two ends of the RX coil cable into the two connectors on the cable reel / pre-amp box.

A.  Connect to the GroundTEM instrument

• On your chosen device, look for the GroundTEM Wi-Fi network and connect;
• The SSID for the Wi-Fi network is “GroundTEM####” where the digits are taken from the serial number;
• The Wi-Fi password is GroundTEM (case sensitive);
• Start the GroundTEM App (Android and iOS compatible);
• Follow on-screen prompts if the device and instrument fail to connect.

B.  Check configuration

• The settings page also allows the choice of “list” or tab view in the data collection screens.
• “List” has all views and functions on a single scrollable screen – if this is disabled, the app will display across three tabs as shown in rightmost screenshots, above.

C.  Choose a suitable measurement script

• Scripts are named according to transmitter loop size – select the correct one for the current layout.

D.  Enter a project name, line/station numbers, and select the measurement duration

• The top box on the main data collection screen allows for data file management – it is possible to survey individual stations, along survey lines, within projects.
• The measurement duration should be selected: 5 or 10 minutes are normally sufficient but if data are coming in cleanly and consistently, it is possible to stop the measurement early without losing data.

E.  Monitor the live results

• Decay curves / apparent resistivity curves can be inspected (swipe left/right to switch between the display formats), to ensure that they are smooth and stable between repetitions;
• It is also possible to check that the instrument temperature and output current, using the monitoring bars.

The most effective way to download data is via the GroundTEM Connect software

A.  Install ABEM GroundTEM Connect

• Download the GroundTEM Connect software from the Guideline Geo webpages (or use link, above);
• Install onto a Windows PC.

B.  Downloading data

• Connect the PC to the GroundTEM Wi-Fi network (ID: GroundTEM####  Password: GroundTEM);
• Click on “Connect to Instrument” (if it fails, firstly check the Wi-Fi connection, then make sure that the GroundTEM Connect settings (“cog” icon) are correct, try the “Default settings” button, if necessary);
• The left panel shows projects on the instrument, whilst the right panel shows the default download location;
• If the right panel is blank, refresh the view (circular arrow icon);
• Select the required projects in the left window and click on the “Copy” button, between the two windows;
• To change the download location, either add a new directory (folder icon) or navigate to an existing directory;
• If the USF file (an industry standard format, compatible with all 1D inversion software) is corrupt or missing, use the “STB -> USF” button to generate a new one from the selected project folder.