Learnto usean impedancegauge!The fundamental measurement techniques
Impedance metersmeasure the amount of impedancealso known as resistance, toanAC.(AC). Thispage provides a detailedoverview of the basics ofimpedance and methods of measuringimpedance, and tips on howto make use of an impedance gauge.
Let’s begin by discussing the definition ofimpedance. Insimple terms, impedanceisthe term used to defineresistance to theflowthroughtheAC current.
When you connect an electricproduct, motororothergadget totheACpower source,current will flowthrough thecircuitry of the device. Impedance iscalculatedby dividing voltage inan AC circuit byits current. Insimple terms, impedance couldbedefined as a limit on theflow of currentwithinanAC circuit. Impedance isrepresented byitssymbol “Z” and measured inOhms(O) (O), the samedevice used to measureDC resistance. Thehigher the impedance,thegreater resistance is thereto theflow of current.
How is impedance measured?
Because impedance is notan actual phenomenon, it’srequired to employ a measuringinstrumentto quantifyit. Instrumentsthat measureimpedance include impedance metersLCR meters and impedance analyzer. There arevariousways that impedance canbe measured.
Thismethod makes use ofan electronic bridge circuit to determineanunknownresistance. It requiresbalance adjustment tobedone using a galvanometer.Although the technique providesa high degree of accuracy(about 0.1%) It’s not the best suitedfor high-speed measurements.
This methodcalculates impedance by measuringthe voltagesof a currentdetection resistor and an unknownimpedance. Itis also ablefor measuringany samplesthat are grounded.When the impedance grows,themethod is more vulnerabletoeffects caused bythevoltmeter.
Method RF I-V
This method usesthe sameprinciple of measurementsimilar to the I-V technique. Itpermits high-frequency impedance measurementswith a circuit thatis compatible with the characteristic impedance ofa high-frequency coaxial cable andcoaxial connectors that are high-frequency.It is difficult to utilize thistechnique for wideband measurement becausethemeasurement frequency bandisrestrictedthrough the tests head’s transistor.
Automatically balancedbridge method
This method is based on the samefundamental measurement principle that is used inthis method, called the bridge. Itprovides coverage foran extensive frequency range(11 mHz to 100 MHz).However, the coveragedoes not extend to the higherfrequencies.ManyLCR metersemploy this technique.
Each impedance analyzer method has its uniqueadvantages and disadvantages, thereforeyou’ll need to definewhat kind of impedanceyou need to measureprior to choosing the appropriatemethod to apply.
By using an impedance meter
The methodused to measure impedanceis determined by the instrumentutilized.For example, Hioki’s LCMeter IM3523measures impedancewith highprecision over a large rangeofmeasurementfrequency settings.
40 Hz measurement
In addition to standard measurement it can alsocontinuously and quickly monitor differentparametersunder differentconditions(measurement frequency andsignal strength).
C-D+ESR Measurement of Capacitors
impedance analyzeralso allows for the saving ofas much as 60 setsof measurement conditionin addition to up to128adjustments for open/short correctionandlength correction.A set of settings can bequickly loaded at onceto enhanceefficiency.
In addition, the instrument’s exteriorcontrol terminalscan be used to createautomatedtesting lines quicker.
Impedance measurement causes instability.measurement
Depending on the method of measurementin use, impedance metersmight return a different measurementevery time a measurementperformed. Ifthemeasurement results do not seem to be stable then check the following:
Components with parasitic characteristics of components that are beingassessed
In addition to the designvaluesfor reactance and resistancecomponentscontain parasitic components thatresult in a variation in the measuredvalues.In addition, differences in thelength ofthe leads that are connectedtocomponents as well as thedistance between themcanresult in measurements that differ.
Measurementof the environment
Impedance measurement results can beaffected by a range ofconditions, includingvariations in temperature notonlyresistors,but also capacitors and inductors andthe probe capacitance and stray capacitor.
Thisrequirement requires actionsthat ensure a consistentmeasurement space and averaging severalmeasurements instead ofusing just onemeasurement tocalculatetheamount.
DC biasor DC istinyvoltage that can be found in measurementinstrumentsand circuits.In particular, it occursin the case of wires and probes thataremade from different materials. Theresultant thermal electromotive forcecan causeDC bias.
Impedance determines the degree of resistance toan AC current. Itsmeasurement requiresa dedicated instrument.Since there’s a myriadofmeasurement techniques so it’s essential to pickthebest one based onyour purpose and each method’sadvantages anddisadvantages.
Impedance measurements are extremelydelicate and is susceptible to variationsbecause of factors likefrequency, the measurement environment andDC bias. Thisrequiresprocedures like averaging severalmeasurements.
Impedance measurements of Smart Key/Immobilizer antenna
Conductive polymer capacitors
How to Use
LCRMeter measurement principles
How to Use an LCR Meter: Basic Knowledge