b) measurement category according to EN 61010-1 ................................................................ III 600V
c) degree of housing protection acc. to EN 60529 ..................................... IP40, with open jaws: IP30
d) dimensions ........................................................................................................ 216 × 111 × 45mm
e) weight ......................................................................................................................... approx. 550 g
f) jaws opening distance .......................................................................................................... 53 mm
g) height of open jaws ............................................................................................................. 139 mm
h) maximum diameter of tested cable .................................................................................... 52 mm
i) length of clamp cables ............................................................................................................ 1.5 m
j) working temperature ................................................................................................. –10C…+55C
k) Relative Humidity ................................................................................................................... 85%
l) height ............................................................................................................................... 2000 m
m) quality standard ... design, construction and manufacturing are ISO 9001, ISO 14001, PN-N-18001
compliant
n) the product meets EMC requirements acc. to ............................... EN 61000-6-3 and EN 61000-6-2
11.2.2 Clamps C-4A
Clamps C-4A are used to measure AC in electrical systems of low and medium power. The output
voltage is proportional to the measured current. The output signal is conducted by a cable (1.5 m)
ended with a pin adapted to the socket on the meter.
The arrow marked on one of the clamps indicates the direction of current flow. It is assumed
that the current flows in the positive direction if it flows from the source to the receiver. This orienta-
tion of clamps is required for the correct power measurement.
NOTE!
Do not use non-insulated clamps for conductors with a potential exceeding 600 V
with respect to the ground and in systems with the measurement category higher
than III.
Do not measure currents exceeding 1200 A. Limit the measurement time for cur-
rents higher than 1000 A, according to the following data:
Reference conditions
a) temperature .................................................................................................................. +20…+26°C
b) relative humidity ............................................................................................................... 20…75%
c) conductor position ..................................................................... the conductor centred in the jaws
d) frequency of sinusoidal current .......................................................................................48…65 Hz
e) Total Harmonic Distortion ........................................................................................................ <1%
f) current constant component ................................................................................................... none
g) permanent magnetic field .............................................................. <40 A/m (Earth's magnetic field)
h) variable, external magnetic field ............................................................................................. none
i) conductors in the immediate vicinity ........................................................................ no current flow
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