Fluke 1625-2 User Manual page 53

Selective Measurement of the Earthing Resistance (R
Measuring method:
Open circuit voltage:
Short circuit current:
Measuring frequency:
Noise rejection:
Maximum overload:
Measuring
Range
0.001...2.999 Ω
3.00...29.99 Ω
30.0...299.9 Ω
0.020 Ω...30 kΩ
0.300...2.999 kΩ
3.00...29.99 kΩ
[1] With recommended current clamps / transformers.
Additional error because of probe and
auxiliary earth typical electrode
resistance:
Measuring error of RH and RS:
Measuring time:
Minimal current in single branch to be
measured:
Maximum interference current through
transformer:
Current and voltage measurement with probe as per
EN61557-5 and current measurement in the individual
branch with additional current transformer.
20 / 48 V ac
250 mA ac
94, 105, 111, 128 Hz selected manually or
automatically (AFC), 55 Hz (R
120 dB (16 2/3, 50, 60, 400 Hz)
maximum Urms = 250 V
Display
Resolution
Range
0.001 Ω
0.01 Ω
0.1 Ω
1 Ω
10 Ω
R
H
typical of 10% of
typical 8 seconds with a fixed frequency
30 seconds maximum with AFC and complete
cycle of all measuring frequencies
0.5 mA
0.1 mA
3 A
)
E
[1]
Accuracy
±(7 % of rdg +2 digit)
+ Ω
( R 2000 )
× ×
S
. 1 25
R
ETOTAL
+
R
ETOTAL
with transformer (1000:1)
with transformer (200:1)
with a transformer (1000:1)
Earth/Ground Tester
*
)
[1]
Operating Error
±(10% of rdg +5 digit)
−
+
6
10 % 5 digits
+
R R
S H
Specifications
45