Both Vx and Vr are vector voltmeters, and Rr is an ideal resistor. The self-balancing bridge means that when the DUT (DeviceUnderTest) is connected to the circuit, the negative feedback configuration of the amplifier automatically causes the OP input to be virtual ground. Vx accurately measures the voltage across the DUT (the Low potential of the DUT is 0), and Vr and Rr measure the DUT current Ix, from which Zx can be calculated.
The test terminals Hp, Hc, Lp, Lc of the HP4275 (subscript c stands for current, subscript p stands for Potentail), and the configuration of Guard (ground) can cause differences in test errors.
The method to improve the accuracy is: 1, Hp, Lp, Hc, Lc as close as possible to the DUT; 2, reduce the loop area & magnetic flux of the test current Ix (the key is to analyze Ix, to use Guard and Cable to minimize the loop area); Use Gurard and Cable to construct the electric field connection between the ground plane interrupt signal lines, although it will increase the capacitance of the signal line to ground (the capacitance to ground does not affect the test results), but it will reduce the mutual capacitance of the signal lines.
The parasitic impedance (Zhg, Zlg) of Guard and Cable does not affect the test results. The voltage across Zlg is 0 when the bridge is balanced, and the current flowing to Rr is not shunted by Zlg. The shunt of Zhg does not affect the voltage measurement of Hp. .
LCR testers are typically used to test inductors and capacitors. The measurement steps are as follows:
1, set the test frequency
2. Test voltage or current level
3. Select test parameters such as Z, Q, LS (series inductance), LP (parallel inductance), CS (series capacitor), CP (parallel capacitor), D, etc.
4, instrument calibration, calibration is mainly for open circuit, short circuit calibration, high-end instruments to load calibration
5, select the test fixture
6, fixture compensation
7. Put the DUT on the fixture and start testing.
The digital bridge can be used for the verification and transmission of impedance gauges by the metrology test department, as well as the conventional measurement of impedance components in the general sector. Many digital bridges have a standard interface that automatically divides the component under test according to the accuracy of the measured value. It can also be directly connected to the automatic test system for automatic inspection of the product on the component production line to achieve the production process. QC. In the mid-1980s, there were dozens of digital bridges with a common error of less than 0.1%. Digital bridges are evolving toward greater accuracy, more functionality, speed, integration, and intelligence.
Capacitor C, inductor L, and resistor R are the most commonly used electronic components in electronic product design. As a common small passive device, it does affect the parameters of the circuit, and the quality of the electronic products directly involved. So for each component (capacitor / inductor / resistor), we need to understand its characteristic parameters, but also need to accurately measure these parameters at all times.
The LCR tester is used to test component (capacitor / inductor / resistance) parameters. In general, the resistance can be measured by measuring the DC resistance value. This can be done with a multimeter (eg GDM-8261A) or a resistance tester (eg GOM-802). In addition, the fixed-latitude electronics LCR-8000G series also have DC resistance measurement. Features. Unlike ordinary resistors, for inductors and capacitors, AC is required for measurement. The LCR tester is measured using AC power. For AC, the ratio of voltage V to current I is impedance Z, the resistance R in DC mode is only represented by 'size', and impedance Z does contain two elements of 'size' and 'phase' in mathematics. It is represented by a complex number and a vector.
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