Handling Probe's Sensitivity To External Currents And Voltages - Keysight N7040A User Manual

4 Overview

Handling Probe's Sensitivity to External Currents and Voltages

The sensitivity of the N7040A/41A/42A probes to currents that are outside the closed loop of the
Rogowski coil is very small, provided that the external currents are less than the current rating of the
probe or that such currents are relatively distant from the coil.
Following are some of the recommendations to handle probe's sensitivity to external currents and
voltages.
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In the vicinity of a multi-turn conductor, the effects are far stronger than from a single conductor
carrying the same current, and such positions should be avoided.
If there is a surface with a high voltage very close to the coil and the voltage is subject to high
rates of change (for example, 1kV/ìs) or high frequency oscillations in the MHz range, then
measurement errors can arise due to capacitive coupling to the coil.
To check for any unwanted response to adjacent fields, it is recommended to quantify the output
of the probe when close to (but not encircling) the conductor under test. This will reveal the
magnitude of any unwanted responses to currents close to, but outside, the coil.
N7040A/1A/2A Rogowski AC Current Probes User Guide