18
N2780/1/2/3B User’s Guide
Safe Probing
CAUTION
The N2781B probe is rated for maximum input under two conditions in
addition to the input maximums shown in the
on page 29. These are (1) 300 A
peak
for
noncontinuous input and (2) 500 A
peak
for pulse widths 30 µs. (1)
indicates an upper waveform response limit of 30 A
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.
CAUTION
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. See
.
Figure 6
Use the Opening Lever
NOTE
The output of this unit is terminated internally. Use an oscilloscope with
an input impedance of at least 1 M
Ω
or use the Keysight E2697A
impedance adapter.
NOTE
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.
NOTE
When performing continuous measurements, it is necessary to be aware
that the offset voltage drifts, depending on factors such as the ambient
temperature.
