MRU-30
– USER MANUAL
46
Other technical data
a) type of insulation ....................................... double, in accordance with EN 61010-1 and IEC 61557
b) measurement category (for 2000 m a.s.l.) .................................. CAT III 300 V acc. to EN 61010-1
c) protection class of enclosure in accordance with EN 60529 .................................................... IP65
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 for measurement of earth ground resistance by means of the clamp
method is performed ........................................................................................................ 3 A RMS
g) frequency of the measurement current ...................................................... 125 Hz for 50 Hz mains
................................................................................................................. 150 Hz for 60 Hz mains
h) measurement voltage and current for R
CONT
.............................................. V<24 V RMS, I>200 mA
i)
measurement voltage for R
E
2P, R
E
3P, R
E
4P .................................................................. 25 or 50 V
j)
measurement current (short-circuit current) for R
E
3P, R
E
4P .............................................. > 20 mA
k) maximum resistance of auxiliary electrodes .......................................................................... 20 k
l)
signaling of insufficient clamp current ................................................................................
≤0.5 mA
m) power supply ................................................ rechargeable batteries type SONEL NiMH 9.6 V 2 Ah
n) AC adapter for the battery charger .......................................................... 100 V to 240 V, 50/60 Hz
o) number of measurements for R
CONT
........................................... >3000 (1
, 2 measurements/min)
p) number of measurements for R
E
......................................................................................... ..>2000
......................................................... (R
E
=10
, R
H
=R
S
=100
, 25 V 50 Hz, 2 measurements/min)
q) R
CONT
resistance measurement duration .................................................................................. <4 s
r) duration of a resistance and resistivity measurement by means of other methods .................... <8 s
s) dimensions.............................................200 x 150 x 73 mm / 7.9 x 5.9 x 2.9 in (without test leads)
t) weight with batteries .............................................................................................. 1140 g / 2.5 lbs
u) working temperature .................................................................. -10
C to +50
C / +14
F to +122
F
v) temperature range for battery charging ................................... +10
C to +40
C / + 50
F to +104
F
w) temperatures at which battery charging is prevented..... < 0
C and
≥ +50
C / < 32
F and
≥ +122
F
x) reference temperature.........................................................................................
23 ±2
C / 73
±4
F
y) storage temperature ............................................................................. -20 to +60
C / -4 to +140
F
z) relative humidity .............................................................................................................. 20 to 90%
aa) relative humidity nominal ................................................................................................. 40 to 60%
bb) altitude. ............................................................................................................. < 2000 m / 6560 ft*
cc) quality standard ............................................. design and production in accordance with ISO 9001
dd) the product meets EMC requirements according to the following standards ...................................
...................................................................................................... EN 61326-1 and EN 61326-2-2
NOTE
* Information about the use of meter at altitude from 2000 m to 5000 m
As for voltage inputs E, ES, S, H the instrument is to be considered downgraded to measurement cat-
egory CAT III 150 V to ground (max 150 V between inputs) or CAT IV 100 V to ground (max 100 V
between inputs). Markings and symbols indicated on the instrument are to be considered valid when
using it at altitude lower than 2000 m.
Summary of Contents for MRU-30
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Page 54: ...MRU 30 USER MANUAL 52 NOTES ...
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Page 56: ...MRU 30 USER MANUAL 54 ...
