DC Voltage Gradient (DCVG)
DCVG locates indications of pipeline coating defects. The software records the voltage gradient and GPS location for further review and analysis later. DCVG collects data from data canes connected to the Allegro MX.
To display the main DCVG window, tap 
and DCVG.
DCVG Main Window
The reading area at the top of the DCVG window displays the IR gradient (on reading minus the off reading); millivolt reading (shown as 1 mV in the next example); and polarity if enabled in the DCVG tab of Properties. The polarity arrow displays when readings are greater than 3mV or less than –3mV.
This chapter includes the following topics: