Shenzhen Zhiyong Electronics Co., Ltd
This device is not designed to be entirely water- or dust- proof. To avoid damage, do not use it in a wet or dusty
environment.
The sensor head is a precision assembly including a molded component, a ferrite core, and a Hall Effect element.
It may be damaged if subjected to sudden changes in ambient temperature, or mechanical strain or shock, and
therefore great care should be exercised in handling it.
The matching surfaces of the sensor head are precision ground, and should be treated with care. If these surfaces
are scratched, performance may be impaired.
Foreign substances such as dust on the contact surfaces of the sensor head can cause acoustic resonance and
degrade measurement, so it should be cleaned by gently wiping with a soft cloth.
To avoid damaging the sensor cable and power supply cable, do not bend or pull the cables.
When the power is on, keep closed, except when clamping them onto the conductor to be measured. The facing
surface of the core section can be scratched while it is open.
Do not place any un-clamped conductor with an electric current of a frequency of 10 kHz or more near the
sensor head. Current flowing in the conductor nearby may heat up the sensor head and cause its temperature to
rise, leading to damage to the sensor. For example, when one side of a go-and-return conductor is clamped and
the other side is also placed near the sensor head , even if the electric current is lower than the consecutive
maximum current, electric currents in both sides will heat up the wires and raise the temperature, thereby
causing damage to the sensor.
The maximum continuous input range is based on heat that is internally generated during measurement. Never
input current in excess of this level. Exceeding the rated level may result in damage to the probe.
The maximum continuous input range varies according to the frequency of the current being measured.
If excess current is input, generated heat activates a built-in safety function that blocks normal output. If this
happens, remove the input immediately (remove the sensor from the conductor being measured or reduce the
input current to zero). Wait until the sensor has had sufficient time to cool before resuming operation.
Even if the input current does not exceed the rated continuous maximum, continuous input for an extended
period of time may result in activation of the safety circuit to prevent damage resulting from heating of the
sensor.
At high ambient temperatures, the built-in safety circuit may activate at current input levels below the rated
continuous maximum.
Continuous input of current exceeding the rated maximum or repeated activation of the safety function may
result in damage to the unit.
The probe is rated for maximum input under two conditions in addition to the input maximums shown in the
Specifications. These are (1) 30A peak for non-continuous input and (2) 50A peak for pulse widths 10 µs. (1)
indicates an upper waveform response limit of 30A peak. Use the sensor at RMS current input levels that are
within the rated continuous maximums. (2) Indicates the upper response limit for a single input pulse.
When opening the sensor head of the probe, be sure to operate with the opening lever. If an upper core is forced
to open when the sensor head is locked, the open close mechanism can be damaged.
The output of this unit is terminated internally. Use an oscilloscope with an input impedance of at least 1 MΩ.
Immediately after powering on the probe, the probe may be subject to an appreciable offset drift due to the
effect of self heating. To counteract this, allow the probe to warm up for about 30 minutes before carrying out
measurement.
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