HT instruments GEO416 - Manual (Page 15)

GEO416 - GEO416GS
EN - 14
11. While the instrument is measuring a
screen similar to the one beside
appears where the instrument’s input
interfering voltage value and the
distance set between auxiliary rods are
displayed. When the message
is displayed do not disconnect or touch
the test leads
Value of input interfering
voltage and rods' distance
set
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
12. When the test is over, should the
ground resistivity value be lower than
the full scale, the instrument emits a
double tone indicating the positive
outcome of the test and displays the
resistivity measurement as well as the
interfering voltage value at the time of
measuring
Measurement of ground
resistivity
Value of input interfering
voltage and rods' distance
set
CAUTION
The resistivity 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.
13. When the test is over, should the
ground resistivity value be higher than
the full scale, the instrument emits a
long tone indicating the negative
outcome of the test and displays the
screen beside
Measurement of ground
resistivity higher than the
full scale
Value of input interfering
voltage and rods' distance
set
CAUTION
The full scale is calculated as ρ
MAX
= 2  DIST R where DIST is the value set
for the distance among the rods and R the maximum resistance value which
can be measured by the instrument. The full scale of ground resistivity
measurement depends on the setting of the distance among the rods
14. The measurements can be stored pressing the SAVE key twice (§ 5.1)