GRT300-EU-EN v1.1 08/13
6
Testing
1.
Connect the test leads for 2, 3 or 4 terminal testing.
2.
Press the ON/OFF button and wait for the “Select Function” screen to appear.
3.
Press the "2P", "3P" or "4P" button that agrees with the setup.
4.
Press "TEST/STOP" button to begin the test.
5.
The meter will beep while the test is in progress (approximately 10 seconds) and then the
reading will appear on the lower line of the display.
Notes:
"Rc" & "Rp" LED indications:
Rc: No test current output. Check connections.
Rp: If Rp is on and the display indicates “> 2 k
Ω
”, the earth resistance is greater than 2000
Ω
.
If, in "4P" mode, the display shows "Vp Error", short circuit C1(black) and P1(green).
Measurement Considerations
2 terminal testing of earth resistance is appropriate for most general purpose testing in normally
conductive soil. But, 2 terminal measurements include test lead and contact resistance in the
measurement and the result will be a reading slightly higher than the true earth resistance. When
measured results are higher than desired or if measurement directives require multi-terminal
techniques, switch to the 3 or 4 terminal techniques as needed.
