Before using a 10X attenuator probe you need to adjust this balance for your particular oscilloscope. This adjustment is called compensating the probe and is further described elsewhere in this document. Figure 25 shows a simple diagram of the internal workings of a probe, its adjustment, and the input of an oscilloscope. Active probes provide their own amplification or perform some other type of operation to process the signal before applying it to the oscilloscope. These types of probes can solve problems such as circuit loading or perform tests on signals, sending the results to the oscilloscope.
Active probes require a power source for their operation.
Using Current Probes Current probes enable you to directly observe and measure current waveforms. They are available for measuring both AC and DC current. Current probes use jaws that clip around the wire carrying the current. Probes come with an alligator-clip attachment for grounding the probe to the circuit under test. In practice, you clip the grounding clip to a known ground in the circuit, such as the metal chassis of a stereo you are repairing, and touch the probe tip to a test point in the circuit.