MRU-200-GPS OPERATING MANUAL Version 1.06
54
Earth resistance measurement by means of the impulse method
Range
Resolution
Basic uncertainty
0.0 to 99.
9Ω
0.
1Ω
±(2.5% m.v. + 3 cyfry)
100 to
199Ω
1Ω
impulse shape: 4/10µs or 10/350µs
impulse measurement current: approximately 1A
impulse peak voltage: approximately 1500V
Other technical data
a) Insulation .................................. double-insulated, in accordance with EN 61010-1 and IEC 61557
b) Measurement category ..................................................................................................................
CAT IV 300V (< 2000m above sea level), IV 255V (< 3000m above sea level) EN 61010-1 compliant
c) Protection grade of case in accordance with EN 60529 .......................................................... IP54
d) Maximum interference voltage AC + DC at which a measurement may be performed ............ 24 V
e) Maximum measured interference voltage ............................................................................. 100 V
f) Maximum interference current at which measurement of the earth ground resistance by the clamp
method is performed ........................................................................................................... 3 Arms
g) Frequency of the measurement current .........................................................................................
.......................................... 125Hz for the 16 2/3Hz, 50Hz, 400Hz, and 150Hz for the 60Hz mains
h) Measurement voltage and current for 2P .................................. V<24
Vrms, I≥200 mA for R≤60
i)
Measurement voltage for 3P, 4P .................................................................................... 25 or 50 V
j)
Measurement current (short-circuit current) for 3P, 4P..................................................... >200 mA
k) Maximum resistance of measurement electrodes ................................................................. 20 k
l)
Insufficient clamp current level ..........................................................................................
≤0,5 mA
m) Power supply of the meter ................................... battery package type SONEL NiMH 4,8V 4,2 Ah
n) AC adapter battery charger ................................................................100 V to 240 V, 50 H / 60 Hz
o) Number of measurements for R 2P ....................................... >1500 (1
, 2 measurement/minute)
p) Number of measurements for R
E
........... > 1200 (R
E
=10
, R
H
=R
S
=100
, 2 measurement/minute)
q) Duration of a resistance measurement by means of the two-pole method ............................... <6 s
r) Duration of a resistance and resistivity measurement by means of other methods .................. <8 s
s) Position Accuracy (in good weather conditions and visibility of satellites) ...... 3m / 10ft. (50%CEP)
t) Dimensions ........................................................................ 288 x 223 x 75 mm / 11.3 x 8.8 x 3 ins.
u) Weight with battery .................................................................................................... 2 kg / 4.4 lbs
v) Operating temperature .................................................................... -10 to +50
C / +14 to +122
F
w) Temperature range for battery charging ................................ +10
C to +40
C / +50
F to +104
F
x) Temperature range battery charging unavailable ............ < +5
C /
+41F and > +50
C / > +122
f
y) Reference temperature ....................................................................................
23 ±2
C
/ 73 ±4
F
z) Storage temperature .......................................................................... -20 to +70
C / -4 to +158
F
aa) Relative humidity ............................................................................................................ 20 to 90%
bb) Relative humidity nominal ............................................................................................... 40 to 60%
cc) Quality standard ............................................................................................................... ISO 9001
dd) EMC meets following standards ................................... EN 61326-1:2006 and EN 61326-2-2:2006
