Rev 6 – Feb 2022
Page 21 of 44
½ Cell Calibration
The user can calibrate their cells in the ½ cell offset tab. Cu/CuSO4 cells are not precise instruments,
they are chemical cells. They have minor voltage differences between them all which causes a
measurement value error. Using the ½ cell offset tab the user can calibrate their cells to correct for
the error.
With the survey running, the user places the tips of the survey poles with the cells attached together.
Touching the tips will reduce the non-error voltage to zero. Pressing the green ZERO button will
take a reading and apply an offset to the DCVG channel(s) to correct for ½ cell error.
Start the Survey
Press the SURVEY button to start the survey. The button will turn green when the survey is running.
If GPS synchronization is enabled, survey mode will not start until the GPS engine is connected and
locked. Ensure that the GPS is connected and has a clear view of the sky. Also note that the GPS
may take up to 10 minutes to lock. Once the GPS is locked, the values will begin to appear, and the
Hexcorder Pro will sound a small beep at the start of each cycle.
To pause the survey, press the green SURVEY button and the survey will stop, the button will turn
red.
In manual mode, the surveyor presses the button on the top of any of the half cell extension poles to
take a reading. That reading is stored in the file and the record# increases. As the surveyor moves,
the trailing wire spools out and the chainage increases. The Hexcorder Pro will only take one
reading per interruption cycle no matter how many times the button is pushed.
In any survey mode with DCVG or ACVG, two (or more) half cells must be on the ground when
taking a reading. This can be done by one surveyor who pauses in place until the reading is complete
or by utilizing Y-cables and multiple surveyors. When using the Y cable, the surveyor needs to only
keep one of the two survey poles on the ground at any given time to be ready to take a signal,
allowing for a continuous walking movement.
