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N7026A 150 MHz AC/DC High Sensitivity Current Probes User’s Guide
N7026A Probe
Protecting the Probe Against Damage Resulting from Excessive
Input
The maximum continuous input range is based on heat that is internally generated during
measurement. This range varies according to the frequency of the current being measured.
See
Figure 15
on page 36 to know about the maximum continuous input range for the
N7026A probe. It is recommended not to exceed this range.
Built-in Safety Function
In such situations, when the built-in safety function is activated:
1
Remove the input immediately (unclamp the sensor from the conductor being measured or
reduce the input current to zero).
2
Wait until the sensor on the probe had the sufficient time to cool before resuming
operation.
When the input current is dropped to within the allowed current range and the probe is
allowed to cool down, the normal operation of the probe is restored.
WARNING
The steps and guidelines provided in this topic must be followed to ensure that your
probe is protected against any damage caused due to the input current that exceeds
the maximum continuous input range for the probe.
WARNING
In the following situations, the generated heat activates a built-in safety function in
the probe that blocks normal output to prevent probe damage resulting from heating.
- If the input current exceeds the maximum continuous input range.
- Continuous input for an extended period of time (even if the input current does not
exceed the rated continuous maximum).
- At high ambient temperatures, the built-in safety function may activate even at
current input levels below the rated continuous maximum.
WARNING
If there is continuous input of current exceeding the rated maximum or repeated
activation of the built-in safety function, it may result in damage to the probe.
