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What is input impedance of an oscilloscope?
The input impedance of an oscilloscope is a complex quantity which can be represented by a resistance in parallel with a capacitance between the scope input terminal and the ground. The impedance is thus frequency dependent.
What is 10X on oscilloscope probe?
attenuation
A 10X oscilloscope refers to a probe with an integrated attenuator that delivers an attenuation of 10. This allows the circuits’ impedance to be enhanced by a factor of 10. While the 10X probe is attenuating the signal, it can also reduce the signal entering the oscilloscope.
What are current probes?
Current probes are used to measure control currents for relays in electronic circuits and in evaluation testing of capacitors’ current characteristics.
Why is the input impedance of an oscilloscope high?
After a few MHz the input C dominates the input impedance of the scope. 10 pF is only a few Ohms above 100MHz, a very heavy load. So for high frequencies a 50 Ohm input was developed. These inputs look like 50 Ohms out to 10s of GHz which is a much easier load to drive than a 10 pF load.
Why does an oscilloscope show a different voltage from a…?
If the generator puts out 1 volt at no load, then you will get 0.5V across a 50 ohm load (the 50 ohm source and load impedances act like a voltage divider). The output voltage setting compensates for this. Try setting your scope input to 50 ohms, if it supports this.
What are the sources of error in an oscilloscope?
Errors from nominal or variation with frequency of either the source output impedance or load impedance will have an effect on the signal level developed across the load – in this case the scope input.
Why do input impedances have to be high?
So for high frequencies a 50 Ohm input was developed. These inputs look like 50 Ohms out to 10s of GHz which is a much easier load to drive than a 10 pF load. Originally Answered: At oscilloscopes, why do the input impedance must be high?