An Introduction to Oscilloscope Probes


Speaking oscilloscope probes in general terms …
An oscilloscope (aka scope or O-scope) is a very powerful tool – and probably the most commonly used material – for electrical engineers or anyone who wants to measure the electrical properties of electronic devices. However, it takes more than an oscilloscope; At least one probe is also necessary.

When selecting a sensor for the O-Scope, it is best to check the manual for the O-Scope to see which type of probe is recommended. If the manual is nowhere (which is often the case in the real world), visit the oscilloscope manufacturer’s website for recommendations.

The following information should also be taken into account when choosing probes:

Make sure that the sensor input connector matches the connector of your range.
Most oscilloscopes have BNC connectors; SMA is another possibility. See Figures 1 and 2 below.
Choose a probe with the input resistance and the ability to match the input resistance and the capability of its range. Generally, it is desirable that the probe has the least influence on the measurement loop – this is called the charge effect. Strength and compatibility capability are essential to ensure proper signal transfer and signal accuracy.


Most modern areas allow you to select an input resistance of 50 Ω or 1 M. For a general test, a 1 m input is commonly used. A 50 Ω input resistor is used for high speed (microwave feed) signals, The propagation delays in the logic circuits and impedance tests of printed circuit boards.

Unlike standard input resistance with a range of 1 M or 50 Ω, the range of an input capacity may vary depending on the range of the range and other design features. That being said, a common input capacity for many 1 MW tranches is 20 pf. However, this value can range from 100 pF to 5 pF. The best approach, to match a probe with a scope, is to first select a probe whose capability is within range of its range, then adjust the probe’s ability by adjusting its compensation network by Condenser section of the probe, if possible. This process is known as your name probe compensation.


How many and what types of probes do you need?
The number of probes and the type of sensors you need depend on the current situation. For example, if only individual DC voltage measurements are required, a 1 M passive voltage probe would be required at one end. However, if you set the time to install and maintain high-speed signals, such as NAND data rows on a hard disk (SSD), you have to use two high-speed active differential probes. See Figure 4 for an example of this type of measurements.

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