Oscilloscope probe compensation, Electrical Engineering

Q. what is oscilloscope probe compensation and how is it adjusted? What effects are noted when the compensation is not correctly adjustment?

Direct Probe: This probe  is simplest of all the probe and uses a shielded coaxial cable. It avoids stray pick up which may create problems when low level signals are being measured. It is usually used for low frequency or low impedance circuit. In using the shielded probe, the shunt capacitance of the probe and cable is added to the input impedance and capacity of the scope and acts to lower the response of the oscilloscope to high impedance and high frequency circuit.

External high impedanc34 probes are used to increase the input resistance and reduce the effective input capacitance of the oscilloscope. A resistor and capacitor combination can be added to an oscilloscope as shown. In effect, of the probe, supposing it is intended to attenuate the signal by a factor of 10. By using equation, where k=10, the values of can be computed as under.

The input resistance has been increased by a factor of 10 while at the same time =, the input capacitance has been decreased by a factor of 10. The combination of and is called probe.

Capacitor is usually adjustable to compensate for difference in input capacitance between oscilloscopes. If the probe capacitance is adjusted the wrong value the oscilloscope will exhibit a factor frequency response. The adjustment of probe is usually checked by displaying a square wave on the CRT screen. If the probe is not properly compensated the display of square waveform will be adversely affected. If the value of is too small, the leading edge of the square wave is rounded off but if the value of is too large the leading edge of square wave overshoots.

 

 

 

Posted Date: 7/12/2012 6:20:56 AM | Location : United States







Related Discussions:- Oscilloscope probe compensation, Assignment Help, Ask Question on Oscilloscope probe compensation, Get Answer, Expert's Help, Oscilloscope probe compensation Discussions

Write discussion on Oscilloscope probe compensation
Your posts are moderated
Related Questions
write down the similarities between motors and generators

Q. Show Advantages of Oscillators? Although oscillations can be produced by mechanical devices (e.g. alternators), but electronic oscillators have the following advantages:



You should document each step of each iteration of your design. 1. You should include the following items from your preparation. a. A state diagram of the handshaking receive

Half-wave rectifier: A half-wave rectifier will just only give one peak per cycle and for this reason and other reasons is only employed in extremely small power supplies. A f


Assuming that the receiver sends a XOFF signal when the receive buffer is P% full in order to avoid any data or packet loss.

Latch A 8 bit  latch comprises of transparent latch D flip  flop. It is commonly  used  to interface output  device with  microprocessor. A typical example of such 8 bit  latc

What makes them sine? Ans) Fourier tells that only a sine wave has no harmonic content. The math works out that if you have any wave shape other than a sign wave, you can brea