What is the resistance inside a typical 10X scope probe?
A low input capacitance will reduce circuit loading, improve pulse amplitude measurements, and minimize rise time measurement errors. A quality 10x probe has 15 pF input capacitance or less. Most probes have an attenuation factor of 1x, 10x or 100x. A 10x probe has a total resistance of 9 meg ohms.
What does the probe ratio setting do?
Having a higher attenuation ratio (100:1, 1000:1) will allow you to look at higher voltages, but it will also make the scope’s internal amplifier noise more pronounced. The higher the attenuation ratio, the more scope noise you’ll see. For example, a 10:1 probe will show 10X the noise.
Where do you put the resistance probe in a multimeter?
Put the black probe in the socket labeled “COM” for “common,” meaning it’s common to all measurements. Once it’s there, it’ll never need to be moved. Put the red probe in the socket labeled with the Greek Omega symbol (Ω) for resistance.
Which is the best value to match a probe with a scope?
However, this value can range from 5pF up to 100pF. The best approach, for matching a probe with a scope, is to first choose a probe whose capacitance is within the range of your scope and then fine-tune the probe’s capacitance by adjusting its compensation network using the probe’s trimmer capacitor, if possible.
What kind of connector does an oscilloscope probe need?
Ensure the probe’s input connector matches the connector on your scope. Most oscilloscopes have BNC-type connectors; SMA is another possibility. See Figures 1 and 2 below. Choose a probe whose input resistance and capacitance match the input resistance and capacitance of your scope.
Why does oscilloscope cause short on 3.3 rail?
This means that you are shorting the 3.3 rail to ground with your ground probe. Put the resistor in the return path so that one side of it is ground. That way the ground probe does not hurt it. Use two probes, one for each side of the resistor and use the math function on your O-Scope.