Appendix A

Appendix AWarnings






This instrument can give a life threatening electrical shock of over 400 volts.  Use this instrument with extreme caution. Only experienced and trained personnel should be allowed to operate this instrument. That chosen operator should also realize that the high voltage risk extends all the way to any of the electrodes. The operator of the instrument is responsible for assuring the safety of the entire array. No humans or animals should be allowed access to the electrodes, the electrode cables or the instrument during the survey.






Never operate this instrument during thunderstorms or any lightning activity. Even lightning that is very distant can generate thousands of volts over large electrode arrays. These lightning induced voltage transients can easily damage the instrument and kill or maim humans or animals.






These last possibilities are not very likely, but should, nonetheless, be avoided. A power line falling on or near one of the resistivity cables can route high voltage back to the operator and main or kill (avoid running the electrode cables near power lines if possible). Secondly, a strong cable run across a vehicle crossing can be caught by a passing vehicle and the vehicle can pull the entire cable with enough force to kill any person entangled in the cable. (this can happen when the cable is being "shoulder rolled" or "neck rolled"). At least one person has been killed in this strange circumstance.


Never use non-polarizable electrodes with any version of the MiniRes.  These chemical-solution devices are susceptible to breakage, leaks, and freezing. The architecture of the MiniRes is such that use of non-polarizable electrodes actually yield poorer quality data.

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