Amprobe GP-2A Manual De Uso página 12

8. Press GO key, the instrument starts carrying out measurement
9. While the instrument is measuring a screen similar to the one below appears where the
instrument's input interfering voltage value is displayed. When the message
is displayed do not disconnect or touch the test leads
�CAUTION
When starting measurement the input interfering voltage is measured at both the volt and
ampere circuit. Should it range between 3 V and 9 V, the instrument carries out measurement
and displays the symbol � indicating the uncertainty decline of the measurement (§ 9.1)
10. When the test is over, should the earth resistance value be lower than the full scale, the
instrument emits a double tone indicating the positive outcome of the test and displays
the resistance measurement as well as the interfering voltage value at the time of
measuring
�CAUTION
The resistance measurement is effected with 4-wire volt ampere method without being
affected by the resistance value of the cables. It is therefore not necessary to effect
compensation of cable resistance or of any extension
11. When the test is over, should the earth resistance value be higher than the full scale, the
instrument emits a long tone indicating the negative outcome of the test and displays
the screen below
12. The measurements can be stored pressing the SAVE key twice (§ 5.1)
(Input interfering voltage value)
(Earth resistance measurement)
(Input interfering voltage value)
(Earth resistance measurement higher than full scale)
(Input interfering voltage value)
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