User manual

PQM-702, PQM-703 Operating Manual
106
7.2.2 C-5 current clamp
The C-5 clamp is used to measure the alternating and
direct current without interrupting the circuit with the flowing
current. The measuring range is 1400 A for DC and 1000 A
AC. The output signal is voltage proportional to the meas-
ured current. The clamp has one 1000 A measuring range,
with the 1 mV/A sensitivity, DC zero adjustment knob, and
LED power supply indicator.
The output signal is supplied by a 1.5-meter lead with a pin
adapted for the socket in the meter.
The arrow located on one of the jaws indicates the current
flow direction. It is assumed that the current is flowing in the
positive direction if it is flowing from the source to the re-
ceiver. Such clamp orientation is required for a correct
power measurement.
 Overload:
 Direct current (DC): up to 3000 A (continuous mode),
 Alternating current (AC): up to 1000 A in continuous mode up to
the 1 kHz frequency
 Limitation of maximum current for continuous operation for frequencies above 1 kHz ac-
cording to the relationship: I
cont
= 1000 A/f [kHz]
 Switching on
To switch on the clamp, put the switch in the 1 mV/A position. Green LED indicates the
correct operation. If after switching the LED is not lit or goes off, replace the battery.
 DC zero indication correction
Make sure the jaws are closed and there is no conductor inside them. Then, connect the
clamp to the analyzer and launch the “Sonel Analysis 2” software in the instantaneous
values viewing mode (check if the measurement point is correctly configured for meas-
urement with the C-5 clamp). Press the knob and turn until the DC current indication is
zero.
 Reference conditions
 Temperature: +18…+28°C
 Humidity: 20…75% RH
 Battery voltage: 9 V ± 0.1 V
 Conductor position: conductor centered in jaws
 Current: direct (DC) or sinusoidal (AC) f ≤ 65 Hz
 Continuous magnetic field: earth field (<40 A/m)
 Alternating magnetic field: none
 Conductors in direct vicinity: no flowing current
 Technical specification
 Accuracy:
Current range
0,5…100 A
100…800 A
800…1000 A (AC)
800…1400 A (DC)
Basic uncertainty
1)
 1.5% + 1 A
 2.5%
 4%
1)
as % of measured value
Fig. 45. C-5 clamp.