Pointers two data pointers represented by crosses (X1 and X2) are present on the active data bank the active data bank choices are shown at the top of the graph. To move the pointer 1 the left and right arrow keys are used alternatively click the left mouse button near to the desired data point on the active data bank the pointer will jump to this point. Using the up and down arrow keys will move pointer 2 and pressing the right mouse button will jump pointer 2 to the nearest data point. The pointer positions are displayed on the right hand side of the tool bar trend and average is calculated with the data between the two data pointers and displayed. For log graphs the X axis data point is 1En where n is the value displayed.

Mouse Zoom clicking the left mouse button on the graph starts the zoom operation. After which the mouse pointer will be followed by a rubber band box to show the area to be magnified. Clicking the left mouse button again will magnify this area or clicking the right mouse button will cancel the zoom operation. Max and Min X and Y values of the zoom box are displayed on the right hand side of the tool box. For log graphs the X axis data point is 1En where n is the value displayed.

Labels to add a label on to the graph position the mouse pointer in the top left area for the label to reside and click the left mouse button. A box will appear beneath the mouse pointer the text for the label can now be typed. The selected label on the graph is shown by the box around the outside of the text. Clicking the mouse on a previously entered label will select it. The label can be dragged to any position on the graph by clicking on a label and with the button still pressed move the mouse to any position on the graph. The label will be transferred to this new position the moment the button is released. Clicking the right hand mouse button on a selected label will produce a pop up menu allowing the selected label to be edited.

Peak count is used to count the number of peaks above or below a trigger line. Position the mouse over the graph and click the left mouse button this will position a trigger line on the graph. If the calculate button on the tool bar is now selected then any peaks (anodic or cathodic depending which is selected) that cross through the trigger line will be shown in the box below the calculate button.

LPR Ruler a ruler can be manually placed along the data in order to estimate the data’s LPR. Use the right mouse button to position the ruler and the left mouse button to change the rulers angle. The rulers LPR is displayed at the left hand side of the tool bar along with options to calculate the LPR result for the active data bank using the least squares fit method and store either result under the active bank for later analysis. This function is only available for sweep data on a linear graph.

Tafel Rulers can be placed over the data in order to measure the tafel slopes and current intercepts. When the mouse pointer is above the Rp (change of current direction axis) line the anodic ruler can be adjusted and when the mouse pointer is below the Rp Line the cathodic ruler can be adjusted. To change the Rp ruler position the mouse pointer over the Rp ruler the mouse pointer will change to a north/south arrow pressing the right hand mouse button will allow the Rp ruler to follow the mouse pointer up and down the screen. The results (Ba Bc and the intercepts) can be stored under the active bank for later analysis. This function is only available for sweep data on a logarithmic graph.

Prints out the graph to the default printer.

Menus

File: Load graph and Store graph allow the current graph to be stored to a file and restored at a later time. All labels fonts colours graph type etc. are stored as well as the data. Close graph returns to the exploring data file page.

Graph type: LPR displays LPR vs. time graph in either ohms or ohms.cm². Potential displays potential vs. time graph in volts or milli volts. Current displays current vs. time in amps milli amps micro amps or pico amps area corrected or not. Potential / current displays resistance calculated from the potential and current data vs. time in ohms or ohms.cm². Icorr displays the corrosion current vs. time in amps milli amps micro amps or pico amps area corrected or not. Corrosion displays the corrosion rate in mm/year mils/year or total metal loss in mm. A Right hand axis can be added to the graph using any of the data vs time graph types. Sweep graphs can display potential or galvanic sweep data in volts vs. amps or milli volts vs. milli amps micro amps or pico amps area corrected or not. Voltage input contains a list of all the available voltage input graphs. For graphs containing data vs. time the Time axis can be set to seconds minutes hours days or weeks. If FFT (C & V only) is checked then the FFT data will be calculated from any short term current or voltage data this data will be displayed when a potential current or potential / current graph is selected. Point to point runs a D(n) = D(n+1) - D(n) formula for each data point. Log X axis (sweep & FFT only) will Log the current axis on sweep graphs and the frequency axis on FFT graphs. Swap X & Y swaps the X and Y axis i.e. turns the graph onto its side. Join data gaps if checked will draw a line between data points either side of deleted data if unchecked gaps are shown in the data.

Data Banks: The active data bank is shown with a check mark next to the appropriate data bank menu item under the Data drop down menu and also at the top of the graph on the tool bar under the title Active data bank. When the graph is redrawn the selected bank is draw last i.e. on top of the others. Smooth between pointers smoothes the data in the active bank between the two pointers either with a high medium or low factor. Smooth active bank smoothes the active data bank either high medium or low. Smooth all data smoothes all the data displayed on the graph either high medium or low. Delete pointer 1 or 2 deletes the data point under pointer 1 or 2 on the active bank. Delete between pointers deletes all the data between the pointers on the active bank. Info when selected will display information about the active bank. Note book displays the note book for the active data bank. Data conversion allows the conversion of data to a format as used by Excel or the Lotus spreadsheets.

Options: The options section allows customisation of the graphs appearance. Below are the two parts to the options page:

Data bank colours: Clicking on the buttons under the colour label will enable a new colour to be selected for the respective object. The line Width can be increased so that the graphs can be made clearer on LCD screens and hard copies. Data markers can be selected for each bank individually and are useful for black and white hard copies or monochrome screens.

Graph and axis: Long ticks if checked will place long ticks at regular intervals on the graph in order to segment the graph. Data markers if checked will draw a marker at each data point on the graph. Zero plot time axis if checked all graphs will start at zero on the time axis when unchecked graphs will be shown with respect to each others start time. Printer settings enabled the default printer to be changed. The font used for the axis can be selected by pressing the select button.

Analysis:

Long term analysis: The settings for the metal area Ba and Bc entered here are used to calculate the corrosion current (Icorr) and corrosion rate graphs.

Sweep analysis : The corrosion current and corrosion rate for any data bank containing sweep data can be calculated here. The values for LPR Ba and Bc can be manually entered or calculated from the graph. The metal may also be selected from the metal list. Corrosion current and rate can be calculated by using the Stearn and Geary equation or from the average of the tafel rulers current intercepts with the change of current axis. Corrosion rate can be shown in mm/year or mils/year. Print results sends a table of results to the default printer.

Metal editor takes you to the metal editor where new metals alloys may be added to the metals list.

Up-date metal list re-loads the metal list after it has been modified by the metal editor.

Scale: