Learnto operatean impedancemeasurer!Fundamental measurement methods
Impedance metersquantify impedancewhich is the resistance ofanalternating current(AC). Thispage offers a thoroughoverview of the basics ofimpedance, ways to measureimpedance, and tips on howyou can use an impedance measurer.
We’ll begin by defining the termimpedance. Insimple terms, impedanceisa term used to describeresistance to theflowoftheAC current.
If you connect an electricproduct, motororothergadget totheACelectric power supply,current is able to flowthrough thedevice’s circuitry. Impedance isdeterminedby dividing voltage insuch a circuit byits current. Inessence, the term “impedance” canbedefined as the limit offlow of currentwithinanAC circuit. Impedance isidentified bythesymbol “Z” and measured inthe ohms(O) that is the sameunit that measuresDC resistance. Thehigher the impedancethemore resistance there isto thecurrent flow.
How is impedance measured?
Since impedance itself is notan obvious phenomenon, it isnecessary to use a measuringinstrumentto quantifyit. Instrumentsthat can measurethe impedance of an object include impedance metersLCR meters, and impedance analyzer. There area number ofmethods in which impedance canbe measured.
Thismethod usesa bridge circuit to calculateanunknownresistance. It requiresbalance adjustment tobedone using a galvanometer.While the method offersan excellent degree of accuracy(about 0.1%) However, it’s unsuitedto measurements with high speed.
This methodcalculates impedance by measuringthe voltagesthat cross a currentdetector and an unknownimpedance. Itis also ableto measureitemsthat are grounded.The higher the impedance,thetechnique becomes increasingly susceptibletothe effects ofthevoltage gauge.
The RF I -V method
This method followsthe samemeasurement principlessimilar to the I-V technique. Itpermits measurement of high-frequency impedanceby using a circuit thatmatches the characteristic impedance ofa high-frequency coaxial cable andan high-frequency coaxial connector.It is difficult to utilize thistechnique to measure wideband impedance becausethefrequency band of measurementislimitedin the measurement head’s circuit.
This method uses the samefundamental measurement concept asthat of the bridge approach. Itallows coverage ofa broad frequency band(11 mHz to 100 MHz).However, that coveragedoes not extend to the higherfrequencies.A number ofLCR metersuse this technique.
Each impedance analyzer approach has its ownadvantages and disadvantages. Therefore,you’ll need to definethe kind of impedanceyou need to measurebefore you decide on the most appropriatemethod to apply.
Using an impedance meter
The methodused to measure impedanceis determined by the instrumentemployed.For example, Hioki’s LCMeter IM3523measures impedanceat a high level ofprecision over a large rangeoffrequency settings.
40 Hz measurement
In addition to standard measurement it can alsocontinuously and swiftly measure variousparametersunder variousconditions(measurement frequency andthe signal level).
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impedance analyzercan also savethe equivalent of 60 setsof measurement parametersor up-to128adjustments for open/short correctionandlength correction for cables.It is possible to load groups of settingsquickly loadedfor increasedefficiency.
In addition, the instrument’s externalcontrol terminalspermit you to designautomatedtesting lines quicker.
Impedance measurement causes instability.measurement
Depending on the measurement methodin use, impedance meterscan return a different numbereach time a measurement ismade. Ifthemeasured values do not stabilize make sure you check the following factors:
Parasitic components of the components beingevaluated
In addition to the designvaluesfor resistance and reactance,componentshave parasitic components thatcause variability in measuredvalues.In addition, differences in thelength ofthe lead that is connectedtothe components and thedistance between themcouldcause measured values to vary.
The Impedance measurement results areaffected by a wide range offactors, such asthat of the temperatures notonlyresistors,as well as capacitors and inductors along withprobe capacitance as well as stray capacitance.
Thischaracteristic requires stepsthat ensure a consistentmeasurement environment and averaging multiplemeasurements instead ofrelying on a singlemeasurement todeterminethevalue.
DC biasrefers to asmallelectrical voltage that occurs in the measurement ofdevicesand circuits.For instance, it happenswhen the probe and wirearemade from different materials. Theresultant thermal electromotive forceproducesDC bias.
Impedance determines the degree of resistance toan AC current, and itsmeasurement requiresa special instrument.There are many kindsofmeasurement methods and methods, it’s crucial to pickthebest method based onyour purpose and each method’sadvantages anddrawbacks.
Impedance measurement is extremelydelicate and is susceptible to variationsbecause of factors likethe measurement environment, frequency andDC bias. Thisis why it is necessary to takeprocedures like averaging severalmeasurements.
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