Amprobe GP-2A Manual De Uso página 19

The H rod's resistance RH > 50KΩ is summed up to the ampere circuit
The resistance of rod H exceeds the value 1200 + 100 RX [Ω] (where RX is the earth
resistance value)
3. When starting a measurement the instrument checks the continuity of measuring
cables. If the volt circuit (red cable S and green cable ES) and the ampere circuit (blue
cable H and black cable E) are both interrupted or their resistance values are too high,
the instrument displays a screen similar to the one below. Check that the terminals are
properly connected and that the earth rods connected to terminals S and H are not
driven into a pebbly or scarcely conductive ground. In this latter case pour water around
the rods to decrease their resistance value (§ 11.2).
RP, RC>top is displayed when:
the S rod's resistance RS > 50KΩ is summed up to the volt circuit and the H rod's
resistance H RH > 50KΩ is summed up to the ampere circuit
both the S rod's resistance and the H rod's resistance exceed the value 1200 + 100 RX
[Ω] (where RX is the earth resistance value)
4. When starting a measurement, if the red cable (connected to S terminal) and the green
cable (connected to ES terminal) are reversed, the instrument does not effect the test,
emits a long sound tone and displays the screen below
5. When starting a measurement, if an interfering voltage higher than 9V is detected at
the volt circuit's input, the instrument does not effect the test, emits a long sound tone
and displays the screen below
(Ampere circuit's resistance too high)
(Value of input interfering voltage)
(Example for 3W mode)
(Both volt and ampere circuits' resistance too high)
(Value of input interfering voltage)
(Example for 3W mode)
(Red and green cables reversed)
r
(Example under mode)
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