Performing Measurement - YOKOGAWA 701928 User Manual

Performing Measurement

6
• The maximum continuous input range is determined from the rise in
temperature resulting from self-heating during measurement. Do not
input currents exceeding this range. Doing so can cause damage.
• The maximum continuous input range differs depending on the frequency
of the measured current (see page 9, "Product Specifications").
• If a current exceeding the maximum continuous input range, heat from
the input the sensor will trigger the probe's internal protection function
which will interfere with normal output. If this occurs, immediately
remove the sensor from the conductor under measurement, or set the
input current to zero. A sufficient cooling off period must be given until
normal operation is restored.
• Heat generated by an input current whose frequency is 1 kHz or higher
is mainly due to self-heating of the sensor head. In this case, the
protection function is not activated. Therefore, be careful of burns, short
circuits, and other accidents or sensor damage and the like caused by
the temperature increase.
• The overcurrent protection function may activate under high
temperatures, resulting in measured currents at or below the maximum
continuous input range.
• Continuous input exceeding the maximum continuous input range, or
continual activation of the protection function can damage the probe.
• Product specifications showing the maximum continuous input range
also indicate a maximum peak current value of 50 Apeak, non-
continuous. This shows that the upper limit of the waveform response is
50 Apeak. Ensure that the current (RMS) does not exceed the maximum
continuous input range.
• When opening the sensor head, always use the open/close lever. If you
press the upper core while the sensor head is locked, the open/close
mechanism can be damaged.
• Do not apply force to the sensor head in the direction indicated in the
figure below.
Do not press
• To maintain the probe accuracy within the specifications and to verify
that correct measurement results are being obtained, periodic calibration
is necessary. The calibration period varies depending on your operating
environment and the frequency of use. We recommend that you set
a calibration period according to the frequency of use and ask us to
calibrate it periodically.
CAUTION
Upper core
Locked
IM 701928-01E