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

How does a mosfet amplify electrical signals, Q. How does a MOSFET amplify ...

Q. How does a MOSFET amplify electrical signals? While a minimum requirement for amplification of electrical signals is power gain, one finds that a device with both voltage an

Determine the synchronous speed in revolutions per minute, Q. Determine the...

Q. Determine the synchronous speed in revolutions per minute and the useful torque in newton- meters of a 200-hp, 60-Hz, six-pole synchronous motor operating at its rated full load

Show limitations of microprocessor-based control systems, Q. Show limitatio...

Q. Show limitations of microprocessor-based control systems? Practical limitations of microprocessor-based control systems stem from the following considerations: • Finite-w

Basic specifications of a ujt, The very basic specifications of a UJT are: ...

The very basic specifications of a UJT are: Vbb(max) - The maximum interbase voltage that can be applied to the UJT (b) Rbb-the interbase resistance of the UJT (c) n - The

What is the function of mode set register in 8257, What is the function of ...

What is the function of mode set register in 8257? The mode set register is used for programming the 8257 as per the needs of the system. The function of the mode set register

Explain sampling and pulse modulation, Q. Explain Sampling and Pulse Modula...

Q. Explain Sampling and Pulse Modulation? In most analog circuits, signals are processed in their entirety. However, in many modern electric systems, especially those that conv

Cro, Diagram and explanation of cro

Diagram and explanation of cro

Find the antenna temperature, Q. If an antenna has an available noise power...

Q. If an antenna has an available noise power of 1.6 × 10 -15 W in a 1-MHz bandwidth, find the antenna temperature.

Telecommunication principles, Draw the block diagram of TDM-PCM system. Exp...

Draw the block diagram of TDM-PCM system. Explain each block. Calculate the bit rate at the output of this system

Static v- i characteristics - power semiconductor devices, V- I Characteris...

V- I Characteristics The operation of the  diac can be explained by imagining it as two diodes connected  in series. When  applied voltage in either polarity is small ( less t

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