Oscilloscope probe compensation, Electrical Engineering

Assignment Help:

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.

 

 

 


Related Discussions:- Oscilloscope probe compensation

Induction motor, A very widely used alternative form of synchronous motor i...

A very widely used alternative form of synchronous motor is the  ' indu c tion motor'. This has the advantage that it does not require an auxiliary motor to run the rotor up t

Current trasnsformer, A 13.8 kV feed er circui t breaker has a 600:5 multir...

A 13.8 kV feed er circui t breaker has a 600:5 multira tio curr ent transform er with charact eristics as show n in Figure 5.11. Th e max - imum load on the feed er is 80 A pri mar

Compute the load power factor, Considering Figure, let balanced positive-se...

Considering Figure, let balanced positive-sequence, three-phase voltages with ¯V AB = 100√3 0° V (rms) be applied to terminals A, B, and C. The three-phase wye-connected balanced

ELECTRO MAGNETIC INDUCTION, If aluminium and copper pipes are of same lengt...

If aluminium and copper pipes are of same length and diameter ... same magnet dropped through them...in copper it takes more time to come out of other end, i myself have done this.

Give the significance of sim and rim instruction, Give the significance of ...

Give the significance of SIM and RIM instruction available in 8085. Instruction SIM: Set Interrupt Mask. This is a 1 byte instruction and can be used three dissimilar functio

Pdc, disadvantages of shunt&series clippers

disadvantages of shunt&series clippers

Features hindering developing countries from growing faster, Q. Describe so...

Q. Describe some of the features hindering developing countries from growing faster. Answer: One of the features that are able to be hold developing countries from growing fas

Gto - gate turn off, GTO ( Gate Turn Off) GTO stands for gate  turn o...

GTO ( Gate Turn Off) GTO stands for gate  turn off  thyristor . it is four layer  PNPN  device. It can be  triggered into conduction like a conventional thyristor  by a pulse

Inductive coupling, advantages and disadvantages of inductive coupling

advantages and disadvantages of inductive coupling

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd