There are a couple of of ways to measure current with a measuring current with oscilloscope. The most simple is using a current probe which requires that you short circuit the probe ground wire to the probe tip, and connect the probe tip to your current measuring conductor (Figure 7). Since the probe has a series resistance, this results in a voltage drop across the probe that is proportional to the current passing through it. The voltage produced is measured by the scope and displayed on the screen as a waveform. You then have to do some math on the measured waveform (integration) in order to determine the current.

Unveiling Insights: How to Measure Current with an Oscilloscope Like a Pro

Another method of measuring current is to use a current clamp such as the Hantek CC65 or another similar device. This method works by detecting the changing magnetic field generated by the current through a set of ferrite semicircles in a Hall sensor and then generating a voltage that is proportional to the change in current. This voltage is then measured by the scope and displayed on the screen in a much more user-friendly manner as a waveform. Again, you will need to do some math on the waveform (integration; most scopes have this under their math menu) in order to determine the current.

In either case, the resulting measured values will allow you to visualize the changing nature of the current in your system and may be useful in identifying areas where power is being drawn unnecessarily. In this way, you can take steps to reduce your current consumption and maximize energy efficiency in your electronic systems.

Written by warnertv