a) ratio ................................................................................................................... 100 mV AC/1 A AC
b) frequency range........................................................................................................ 40 Hz...10 kHz
Other data
a) insulation type ............................................................................. double, according to EN 61010-1
b) measurement category according to EN 61010-1 ............................................................... III 600 V
c) protection class according to EN 60529 ................................................. IP40, with open jaws: IP30
d) dimensions ......................................................................................................... 135 × 50 × 30 mm
e) weight ......................................................................................................................... approx. 180 g
f) jaws opening distance .......................................................................................................... 21 mm
g) height of open jaws ............................................................................................................... 69 mm
h) maximum diameter of tested cable .................................................................................... 20 mm
i) length of clamp cables ............................................................................................................ 1,5 m
j) operating temperature .............................................................................................. –10C…+55C
k) relative humidity ..................................................................................................................... 85%
l) altitude (above sea level) ................................................................................................... 2000 m
m) quality standard ...............................................................................................................................
............ design, construction and manufacturing are ISO 9001, ISO 14001, PN-N-18001 compliant
n) the product meets the EMC requirements according to ................ EN 61000-6-3 and EN 61000-6-2
11.2.5 Clamps C-7A
C-7A clamps are used to measure alternating currents in networks of low and medium power
within the range up to 100 A.
The output signal is a voltage proportional to the measured current at the sensitivity of 5 mV/A. It
is introduced via a cable (length: 1.5 m) ended with a plug suitable for a socket in 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.
Reference conditions
a) temperature: ................................................................................................................ +18…+28°C
b) relative humidity: ........................................................................................ <85% (non-condensing)
Technical data
a) test range ....................................................................................................................0…100 A AC
b) frequency range........................................................................................................... 40 Hz..3 kHz
c) maximum allowable continuous current ........................................................... 100 A AC (50/60 Hz)
d) accuracy (sine wave)