Amprobe GP-2 Geo-Test - Manual (Page 10)

GP-2 GeoTest
EN - 10
Press GO to take the measurement and read the result on the display. At the
end of the test, a screen similar to the following will be displayed.
NOTE! If you keep pressing GO, the instrument takes more measurements
consecutively. When a new value is acquired, the symbol
Ω
blinks on the main
display, the instrument emits a short sound and the counter shown on the
secondary display on the left-hand side is updated. This counter indicates the
number of measurements calculated on the basis of the average resistance
value.
0.96 0.96
Ω Ω
2 2 0.93 0.93
Ω Ω
WARNING:
When the message “Measuring” appears on the display, the
instrument is measuring. Do not disconnect the alligator
clips during the measurement
.
Ex.: if the operator takes three measurements consecutively, the instrument will
display:
- 1
st
measurement:
main display = measured resistance value (Ex: 0.90
Ω
)
secondary display on the left-hand side = 001 (no. of measurements = 1
means that 1 earth measurement has been taken)
secondary display on the right-hand side = average of the measurements
taken (in case just one measurement has been taken the average value is
equal to the measured value, in this case 0.90
Ω
)
- 2
nd
measurement:
main display = measured resistance value (Ex: 0.96
Ω
)
secondary display on the left-hand side = 002 (no. of measurements = 2
means that 2 earth measurements have been taken consecutively)
secondary display on the right-hand side = average of the measurements
taken ((Val1+Val2)/no. of measurements = (0.90+0.96)/2 = 0.93
Ω
)
- 3
rd
measurement:
main display = measured resistance value (Ex: 0.93
Ω
)
No. of earth resistance
measurements
included in the
calculation of the
average resistance
Average value of the resistance calculated
as:
(Val1+Val2+…+Valn)/(No. measurements)
Value of the
resistance
GO