Inductance Meters

GAOTek Inductance Meter is a type of electronic test equipment used to measure the inductance of an electronic component. In the simpler versions of this instrument the impedance was measured internally and converted for display to the corresponding inductance value. Readings should be reasonably accurate if the inductor device under test does not have a significant resistive component of impedance. More advanced designs measure true inductance, as well as the Q factor of inductive components..
Usually the device under test (DUT) is subjected to an AC voltage source. The meter measures the voltage across and the current through the DUT. From the ratio of these the meter can determine the magnitude of the impedance. The phase angle between the voltage and current is also measured in more advanced instruments; in combination with the impedance, the equivalent capacitance or inductance, and resistance, of the DUT can be calculated and displayed. The meter must assume either a parallel or a series model for these two elements. Ideal capacitors have no characteristics other than capacitance, but there are no ideal capacitors. All real capacitors have a little inductance, a little resistance, and some defects causing leakage. These can be seen as inductance or resistance in series with the ideal capacitor or in parallel with it. And so likewise with inductors. Even resistors can have inductance (especially if they are wire wound types) and capacitance as a consequence of the way they are constructed. The most useful assumption, and the one usually adopted, is that LR measurements have the elements in series (as is necessarily the case in an inductor’s coil) and that CR measurements have the elements in parallel (as is necessarily the case between a capacitor’s ‘plates’). Leakage is a special case in capacitors, as the leakage is necessarily across the capacitor plates, that is, in series.
Working Principle

We pass an AC voltage through a DUT (Device Under Test). Now the LCR meter is used to measure the voltage and the current across the DUT. The magnitude of the impedance can be calculated from the ratio of these two quantities.

Technologies

GAOTek Inductance meter can also be used to measure the inductance variation with respect to the rotor position in permanent magnet machines. (However, care must be taken, as some LCR meters will be damaged by the generated EMF produced by turning the rotor of a permanent-magnet motor; in particular those intended for electronic component measurements.)

Handhold LCR meters typically have selectable test frequencies of 100 Hz, 120 Hz, 1 kHz, 10 kHz, and 100 kHz for top end meters. The display resolution and measurement range capability will typically change with the applied test frequency since the circuitry is more sensitive or less for a given component (ie, an inductor or capacitor) as the test frequency changes.

Some Techniques Used with LCR meters

·       Bridge Method

·       Current-Voltage Technique

Features

GAO Tek Clamp Meters include following features listed below:

Automated identification:

With Ai the testing and measuring experience is easy; eliminating unnecessary trial and error time—with just a single push of a button. This unique feature automatically specifies L, C, or R with parallel and series mode, without the need to manually change buttons.

Detailed component analysis :

The handheld LCR meters allows you to test various component types, including secondary components of Dissipation Factor (D), Quality Factor (Q), and Angle Indication of Impedance (θ). This new handheld series also includes other functions that result in a more detailed component analysis. For example, the built-in Equivalent Series Resistance (ESR) function helps you better understand the inherent resistance behavior typically found in capacitors across selected frequencies. DCR is a built-in DC resistance measurement that eliminates the use of a separate digital multimeter (DMM) for component test.

Frequency up to 100 kHz :

The test frequency now extends as high as 100 kHz, providing more flexibility to test a wider range of components. A higher test frequency, for example 100 kHz, is useful for applications such as testing aluminum electrolytic capacitors used in switching power supply circuits.

Swept Measurements:

Fast and accurate swept parameter measurements, graphical or tabular, for verification of component and material response to changes in ac test frequency, ac test voltage or ac test current, without the need for complex programming or an external controller

Automated Test Sequencing :

Run up to six different tests in sequence with a single push of the start button. Each test can have different conditions and limits.

Some more Features:

·       20,000 counts resolution

·       0.2% accuracy

·       Wide LCR ranges with 5 selectable test frequencies (100Hz, 120Hz and 1kHz, 10kHz and 100kHz)

·       Auto identification(Ai) which automatically determines and displays component type and measurements

·       Detailed component analysis with DCR, ESR, Z, D, Q, Ө functions

·       Battery life of 16 hours/Ac-powered

·       IR-to-USB connectivity for data logging to PC

Applications

·       Test & Measurement;

·       Maintenance & Repair

·       Actual series resistance

·       Leakage resistance

·       Dielectric loss

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