MultiLoop III - Tutorial 1

1. MultiLoop III - Tutorial 1 Running an existing model

2. Graphic Manipulators MultiLoop III Menu Bar Pick Pan Zoom Rotate Viewing Illumination MultiLoop III Graphic Window Step 1: Start MultiLoop III • Double click on the MultiLoop III Icon • The graphic window and a splash screen will appear • Click on the splash screen • A “New Model” dialogue will appear • Select the coordinate system • Go. Splash Screen Select the azimuth sign convention Select the coordinate convention Specify the azimuth Click OK When done

3. Select the file Navigate to recent places and up the file tree here Change the view to alternate between the hierarchy and sorted names here Click “Open” when done From the File Menu, Select open Step 2: Open a .mlp file • .mlp files store MultiLoop models • From the File menu, select open • From the Open File dialogue, select a file • In this case, HalfPlanecoef1511.mlp is used • Go…

4. Data are plotted in “stacked profile” format along the line Letters after the line labels refer to the coordinate The line is drawn & annotated here in blue Reference axes Receiver component label of the plotted data Transmitter loop Step 3: Model Opens • When the file is opened, the model is displayed • The mesh can be viewed in “mesh” or “tile” view • Keys “b”,”s” control the tile sizes • Keys “l”,”r”,”u”,”d”,”i”,”o” control the view • Arrow keys control panning • Go…. The mesh is shown as tiles. Tile colour variation indicates variable resistance

5. From the Calculate menu, select Response Step 4: Compute a response • From the Calculate menu, select Response • This starts the computation. A text output window records the progress of the calculation • Initially, the mesh is parsed. The resistive and inductive limits are found, then a time step solution in found • The profile response is then computed, and the data are plotted • Go…

6. Inductance calculations Messages from the geometric optimizer Geometric summary of the mesh Primary field, Inductive, Resistive Limits Time Stepper Iterations per step Time step count Time per step Latest step time Rate of change in the stream potential Step 5: Calculating Text Output Window (may be the console) Basis function generation Inductance calculations

7. A message box appears when the calculation is done. Click OK. Step 6: Calculation completes

8. The File Dialogue Appears Select the file name to write To export to a file, select Write Data Select the directory Save Step 7: Write out data • Data can be output to a Geosoft style ASCII file • Select the Exports Menu, then Write Data • A file dialogue will appear, select the file to create • There is only simulated data in this session; you will be asked whether to write out transformed data. • Answer No, Transforms will be covered later • Go…. Select yes to write the calculated data to the file. Transforms will be explained later. Transforms allow the data to be transformed before writing.

9. Done • An ASCII file with the data has been created. • This file can be opened with an a text editor such as TextEdit, BBEdit or WordPad • The file data can be imported into programs such as OasisMontaj and MultiLoop III