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Global earth resistance meter - HT M71
The M71 meter is a device manufactured by HT company. It was made to perform the Earth Resistance measurement that have 2-wire and 3-wire standard methods having a measurement range of 50 kOhm. The calibration of test cables and automatic regulation of noise voltage disturbances are incorporated as functions of the device. Some of its accessories includes the KIT0071 having a set of 3 cables + 3 alligator clips + 2 probes, the SP-6085 or the carrying bag for M71 instrument. The ISO9000 calibration certificate goes with the user manual on CD-ROM. In order to further eliminate the noise voltages disturb which can be present on installation, the measure must be performed with a test current at high frequency.