VI curve analysis, also known as ASA, does not involve circuit principles and does not require the circuit to be in working condition. Therefore, it can be used for fault detection of circuit boards separated from the equipment (no online detection required), and no need to draw data; it is strictly prohibited to carry power or measure undischarged capacitance. Since the circuit board does not require power, the circuit board is relatively . It does not involve the function of the device on the circuit board, so no matter what type of device the circuit is composed of, digital, analog, digital-analog hybrid, known function, unknown (such as dedicated, programmable), etc., it can be tested; it is passed Testing on circuit nodes (device pins) is basically not limited by the packaging of components on the circuit board. Since a single device can be regarded as the simplest circuit board, ASA technology can also be used to detect the quality of large-scale, complex or unknown integrated devices. In fact, due to constraints, ASA is the only way for many users to detect such devices. In addition, ASA is convenient and intuitive for testing the functionality of discrete components. The resistance of VI is the same as that of a multimeter, but the resistance voltage of the multimeter is lower, and this instrument uses AC signals to excite circuit nodes. Since the amplitude and frequency are both adjustable, the amplitude close to the working voltage can be used for excitation, and the measured graphics will be more realistic. Faulty nodes can be found through comparison. Since the current applied to the components is limited, this technology does not affect or damage any components. ASA has many advantages and has proven to be a fast and effective fault diagnosis technology. 1. 1.3-inch OLED display 2. Built-in battery, 3000mAh 3. Working voltage: 4V 4. Test frequency: 50Hz, 300Hz, 2kHz, 13kHz 5. 4 levels of ernal resistance adjustable: 56R, 470R, 1.5K, 20K 6. Curve shift: Yes 7. True dual channel: yes 8. Simultaneous display: Yes 9. Program control: Yes 11.Note: Please discharge before measuring, otherwise the instrument will be damaged. 12.Colour:Black 13.Material:plastic 14.Size:14.5 x 8.2 x 4cm Package Contents: 1 x VI curve tester 2 x BNC cables 2 x test leads 1 cord Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.