The DET62D is a fully automatic, three terminal instrument built into a rugged, water resistant case giving protection for outdoor use. The instrument is suitable for the testing of single ground electrodes such as lightning conductors and other small grounding systems. The resistance of conductors such as conduit coupling joints can also be measured.
Ground resistance can be measured directly from 100 mΩ to 2 kΩ. The ground resistance reading is displayed quickly and accurately on a large, clear 3 1/2 digit liquid crystal display. LEDs indicate when there is a high auxiliary current spike or voltage probe resistance which may affect the ground resistance measurement. The instrument uses the three-terminal method of measurement in which the ‘X terminal is connected to the electrode under test and the ‘C’ and ‘P’ terminals are connected to temporary, remote current and potential electrodes. Operation is started by pushing a button on the front panel. All other functions of the DET62D are completely automatic. The instrument checks for conditions that may cause an invalid reading during a test. The low service error and wide operating temperature range enable accurate results to be achieved in real on-site conditions.
The test frequency has been chosen to avoid interference from stray currents at power frequencies and their harmonics. An LED indicates when the noise interference is too high to take a valid reading.