34
N2780/81/82/83 User’s and Service Guide
C A U T I O N
•
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. See the
figures in “Specifications and Standards Applying”
•
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 and Characteristics"
on page 18. These
are (1) 30 Apeak for noncontinuous input and (2) 50
Apeak for pulse widths 10 µs. (1) indicates an upper
waveform response limit of 30 Apeak. 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.
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