This is similar to the surface resistivity survey: the wider the surface electrode range, the deeper the exploration depth. The effective distance between two boreholes in a crosshole resistivity survey is also related to the distance between the top electrode and bottom electrode in each borehole.

A roll-along survey in resistivity exploration is a survey method to cover a long survey line with limited electrodes in each run. For example, the survey line in the figure below needs two runs to cover the survey line with a 64 electrode resistivity meter.

The FlashRES system is capable of completing any kind of 3D survey as shown in the figures below.

These questions applies to all resistivity and IP meters. The exploration depth normally depends on the survey line length and maximum ABMN separations. Since the maximum ABMN separations for the FlashRES resistivity meter are the same as the survey length, the exploration depth for our resistivi...

ZZ array collects 256 AB current pairs. For each AB pair, the instrument collects 61 MN data. So in total, the ZZ Array will collect 15,616 (61*256) MN data. If on_time and off_time are set to 1, it will take about 20 minutes to complete the data collection.

As the figure shows below, within 64 electrodes the FlashRES resistivity meter uses any two electrodes as current electrodes (A and B) and one as a common reference electrode (M) . It then simultaneously measures 61 potentials Vmn1, Vmn2 ...Vmn61 (relative to M) on the remaining electrodes.