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CP03x/CP03xA Current Probes
12
AC Coupling
In general, using offset to adjust a DC current on the screen is the preferred method to
measure transient signals in the presence of a larger DC currents. The offset has limits
that will cause a signal that is beyond the linear operating range of the probe to go off
the screen, preventing measurement errors.
There are times, however, when it is convenient to use AC coupling to remove the DC
component of the measured signal from the measurement. Selecting AC uses the
scope AC coupling at the probe output to remove any steady state value from the
displayed voltage.
NOTE:
Since this AC coupling is on the probe output, DC current beyond the linear
range of the probe will cause the probe to saturate and make the displayed waveform
inaccurate. It is important not to exceed the maximum linear input values when using
AC coupling. The maximum DC input current is 30A when the probe is in 0.1 V/A
sensitivity (>100mA/div), and 5A when the probe is in 1 V/A (≤100mA/div).
Auto Zero
The Probe dialog incorporates an Auto Zero function to remove the DC offset from the
current probe. Auto Zero must be invoked by the user. After several minutes of
warm-up, or when the probe is exposed to a large shift in ambient temperature, some
DC offset drift may occur. Open the Probe dialog and touch
AUTO ZERO
.
Degauss
If the probe has been magnetized by external magnetic field or by excessive input, the
core can be demagnetized by degaussing. The demagnetizing process takes about 5
seconds and should always be performed before taking a measurement.
Without clamping the probe around a conductor, slide the opening lever to close and
lock the probe. Open the Probe dialog and touch
DEGAUSS
.
An Auto Zero is automatically performed as part of the degauss cycle.
Содержание CP030
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Страница 3: ...CP03x CP03xA Current Probes Operator s Manual September 2016 ...
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Страница 32: ...926878 00 Rev A September 2016 ...