44
4-pole measurement
Measurement range
0.001 –
9.999
Ω
10.00 –
999.9
Ω
100.0 –
999.9
Ω
1.000 –
9.999k
Ω
10.00 -
99.99k
Ω
Resolution
0.001
Ω
0.01
Ω
0.1
Ω
1
Ω
10
Ω
Intrinsic error
± (2% + 3 pt)
Operating error
± (5% + 5 pt)
4.3 EARTH RESISTANCE MEASUREMENT (3-pole position)
The instrument measures the earth resistance of an installation with an AC current.
IMPORTANT REMARKS :
- Fast measurement : pressed briefly, the START pushbutton triggers the earth resistance measurement R
E
only.
- Expert measurement : pressed and held (2 seconds), the START pushbutton triggers the earth resistance
measurement R
E
and the resistance measurement on the auxiliary rods R
S
and R
H
.
4.3.1
CONNECTIONS :
H
S
E
R
E
H
S
E
R
E
4.3.2
PRE-MEASUREMENT SETTINGS
Before the measurement, use the
CONFIG
DISTANCE
CONFIG
CONFIG
DISTANCE
and
keys to successively :
→
select the measurement mode, manual or automatic,
→
in automatic mode :
- select the voltage applied (16 or 32 V)
→
in manual mode :
- select the measurement performed (earth or earth coupling measurement),
- select the measurement frequency (41, 55, 92, 110, 119, 128, 476 Hz, or USr
(1)
)
- select the voltage applied (16 or 32 V)
(1)
The frequency "USr" is defined by the user for between 41 et 512Hz using the
keys.
In automatic or manual mode, the measurement frequency always returns to 128 Hz after the rotary
switch position has been changed. The voltage itself remains stored.
Notes :
→
In automatic mode, the instrument chooses the measurement frequency for which the possible
spurious voltage influence is minimal. If this influence affects the accuracy of the measurement, the
NOISE symbol flashes.
→
In manual mode, if the influence is too high for the selected frequency, the NOISE symbol flashes :
the frequency must always be changed to maintain measurement accuracy.