Generally, the insulation resistance of the 4-5km cable core should be greater than 6-8 megaohms to ensure normal logging needs. If the insulation drops or the cable core breaks, it can cause the instrument to not work properly and affect logging quality. The following detection methods are usually used
1. Use a multimeter to determine the location of cable breakage and leakage.
Record the accurate length and resistance value of the cable before leaving the factory, And the number of meters cut each time and the resistance after cutting, measure the resistance R1 and R2 at both ends of the broken cable accurately According to the relationship between cable length and resistance as shown in the figure, it can be concluded as follows
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