MEGGER
DET3/2 (250302) Hand-cranked digital 3 and 4 pole earth tested
• Three- or four-terminal
measurement selected by a switch
• 50 volt maximum output voltage for safety and convenience
• Direct-reading 3 1/2-digit L.C.D.
• Four ranges covering measurements from 0.01 Ω to 19.99 kΩ
The MEGGER
DET3/2 Digital Earth Tester is a compact instrument designed to measure earth
electrode resistance and soil resistivity. The instrument uses the four-terminal
method of measurement, in which the resistance of the current circuit does not
affect the reading. The instrument circuit has been designed so the resistance
of the potential circuit also does not affect the measurement. Pressing a
latchable button converts the instrument from its four-terminal measurement mode
to a three-terminal one. The reversing d.c. test current has a frequency of 128
Hz, which avoids possible interference from other 50 and 60 Hz stray currents in
the vicinity of the earth electrode under test. In the interests of safety, the
maximum test voltage has been limited to 50 V.
