Differential probe: active ground-free probe.
The differential probe is a special form of the active probe . The differential probe measures the difference between two voltage potentials, without affecting the oscilloscope ground with the circuit under investigation. This avoids the grounding problem .
The figure above shows ...
What do I need an active probe for? To answer this question one first has to look at the properties of a passive the probe. The passive probe consists of a resistor and a (trim) capacitor for balancing. The oscilloscope is composed of an input impedance of one megohm and ...
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Passive oscilloscope probe.
With a BNC cable and corresponding adapters you can directly connect signals to an oscilloscope. So why do you need a probe? To understand this, have a look at an equivalent circuit diagram for oscilloscope, cable, probe and voltage signal ...
The interactive graphic shows the adjustment of a probe. By clicking the probe trimmer the capacity changes. Most oscilloscopes output a test frequency of 1kHz. This frequency is applied to the probe and the measured signal is displayed on the scope.
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Probe of an oscilloscope
A probe is used to define the connection between the oscilloscope and the signal to be measured. It is also possible to use a simple cable, but then the resistance and capacity of the measurement is undefined. At low frequencies in the kilohertz range, this does ...
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