Lcr meter working principle and uses science struck. Introduction q meter is design for measuring the q factor of a coil. It has been largely replaced in professional laboratories by other types of impedance measuring device, though it is still in use among radio amateurs. In addition, some files are archived, so you need winzip or winrar to open that files. Working principle the operations of this useful laboratory. Gate in question paper 2016 with answers solution instrumentation engineering 2016. An ammeter can measure a wide range of current values because at high values only a small portion of the current is directed through the meter mechanism.
Feel free to skip sections if the math gets a little deep for your tastes. Theres only one other circuit in a q meter apart from the xq the voltmeter. Some versions of the lcr meter use a bridge circuit format as the basis of its circuit giving the name that is often used. Working principle and construction of q meter video lecture of measurement of capacitance chapter in subject electronic instrumentation. Velocity transducersensor,working,measurement,circuit diagram. The development of qmeter methods of impedance measurement.
Abstract most homelab measurements of q only evaluate. Q meter working principle and construction electronic. Reduce service costs by giving audiences the opportunity to report water supply incidents, leaks or bursts and. My goal is to answer any question anyone may have about a q meter. Vu meter a volume unit vu meter or standard volume indicator svi is a device displaying a representation. All meter location shall have 247 vehicular access by kiuc and be readily accessible at all times for inspection, reading and testing. Besides, the book covers several laboratory meters such as phase meters, frequency meters, q meters, wattmeters, energy meters, power factor meters, and measurement bridges. An internal dc bias voltage of 2 volts can be selected for use when testing electrolytic capacitors. Working principle and construction of q meter video lecture of measurement of capacitance chapter in subject electronic instrumentation and measurement for electrical. The ratio of the reactance to resistance of a coil or condenser may be expressed as its q.
This site does not host pdf files, does not store any files. The q meter working principle is based on series resonance. Fixture for measuring inductor q with your antenna analyzer. Now the lcr meter is used to measure the voltage and the current across the dut. The hp model 4342a q meter is designed to meet the requirements for making easy and accurate quality factor measurements in the laboratory, on the production line, or in qa incoming inspection areas. Q meter tesla bm 560 a q meter is a piece of equipment used in the testing of radio frequency circuits.
Measurement and instrumentation principles by alan s. The q meter measures the quality factor of the circuit which shows the total energy dissipated by it. A q meter is a piece of equipment used in the testing of radio frequency circuits. The matter presented here is prepared by the author for their respective teaching assignments by referring the text books and reference books. The q meter uses in a laboratory for testing the radio frequency of the coils. A q meter contains in one instrument a frequencycalibrated rf oscillator, a system for rf voltage injection and measurement, a vacuum tube volt meter, a calibrated variable capacitor, and four terminals for the connection of components to be measured. Measurement consists of setting the source frequency and adjusting the tuning. All books are the property of their respective owners. Electronic instrumentation and measurement working principle and construction of q meter. It also explains the properties of the coil and capacitor. All meters shall be installed at kiucs preferred service attachment location, approved by kiuc as shown on page 7. The operations of this useful laboratory instrument is. If the turns in one coil are doubled and that in the other are halved, then the mutual inductance will be 5 mh 10 mh 14 mh 20 mh q.
Qmeter is an instrument designed for measuring quality factor q of a coil as well as for the measurement of inductance, capacitance, and resistance of an electric circuit at radio frequency. This article covers the full range from the theory of tuned circuits and q to repair tips for that battered q meter you bought on ebay. The q multiplier was a common accessory in shortwave receivers of the vacuum tube era as either a factory installation or an addon device. Principles of electronic instrumentation and measurement. You can verify the calibration accuracy by injecting a 4 vrms signal, somewhere in the range of 50100jhz, across the hi post and gnd.
Q meter is design for measuring the q factor of a coil and for measuring. We are revisiting the cold circuit nmr technique which moves the resistor and. Ammeter, instrument for measuring either direct or alternating electric current, in amperes. The american radio relay league arrl is the national association for amateur radio, connecting hams around the u. In principle, low current zeners would be best, but it is not really critical.
A working principle is a regulation or rule that is used so that work can be done. Q electricity often called the quality factor of a circuit, q is defined in. The lcr meter or lcr bridge takes its name from the fact that the inductance, capacitance and resistance are denoted by the letters l, c, and r respectively. Be semesteriii electrical question bank electrical and. The digital voltmeters generally referred as dvm, convert the analog signals into digital and display the voltages to be measured as discrete numericals instead of. Communicate with clients at key times, both from the subscribers and the company perspective.
A q meter contains in one instrument a frequencycalibrated rf oscillator, a system for rf voltage injection and measurement, a vacuum tube volt meter, a. Figure 1 block diagram of the classical q meter as. Circuit diagram, working principle and its applications. It has been largely replaced in professional laboratories by other types of impedance measuring device. The scans are at a fairly high resolution, so the pdf files are rather large. We pass an ac voltage through a dut device under test. This instrument operates on the principle of series resonance i. Q meter circuit diagram working principle impedance. The mutual inductance between two coupled coils is 10 mh. Pdf electronic instrumentation and measurements by david. In use, the q multiplier had to be adjusted to a point just short. If a fixed voltage is applied to the circuit, a voltmeter across the capacitor can be calibrated to read. Directreading instruments for this measurement are commercially.
Signal analysis meter is a portable, high performance qam or analog signal meter specifically designed and manufactured to meet the requirements of modern day catv systems. Test equipment manuals i have begun to scan and post, in pdf format, some of my collection of manuals for vintage test equipment. A simpler method is proposed that uses an swr analyzer along with a spreadsheet that easily computes the unloaded q. Inputs service orders into billing system for meter reading and files service orders and assessments. Velocity transducersensor, working,measurement,circuit diagram,linear velocity electromagnetic transducer,displacement measurement. Service and user manual hewlett packard 4342a level meter. We created the system which helps business leaders to understand their. Working principle of a q meter, electrical engineering.
If you feel the program has been of value to you since i started working on it about 3 years ago please consider a contribution via the link below. Given two coupled inductors l1 and l2, their mutual inductance m satisfies q. To open downloaded files you need acrobat reader or similar pdf reader program. The direct reading, expanded scale of the 4342a permits measurement of q from 5 to and the reading of very small changes in q.
Microwave frequency qmeter is an inexpensive computer controlled. An instrument based on a novel principle of highimpedance injection has been developed, and it is possible to extend the range of accurate measurement to the. Electrical and electronic measurement sample paper msbte pdf book online select one of servers for direct link. The two faces of q wes hayward, w7zoi, november, 2010. Q meter l r signal v v generator multiply q by circuit c q meter tuning capacitor example. Qmeter is the solution for all kind of business and organisations who wants to get feedback from customers by simple way. The principle of this meter mainly depends on series resonance because the voltage drop is q times than the applied voltage across the capacitor otherwise coil. Apply to meter reader, collections system worker, senior plant operator and more. A q meter works on the principle of series resonance. Download file pdf measurement and instrumentation principles by alan s morris solution manual file type instrumentation and measurement working principle and construction of q meter video lecture. The resonance is the condition exists in the circuit when their inductance and capacitance reactance are of equal. The hardware part of the q meter consists of the pllstabilized microwave source with dds generated reference controlled by fast 32bit arm microcontroller.