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China Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
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Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
Xi'an Xu&Hui Electromechanical Technology Co., Ltd. /Xian XZH Electric Power Technology Co., Ltd. Has found in 2013, located in Xi'an, China. which is a highly experienced team dedicated to developing electrical measurement instrument, the product line covers a wide range of devices for testing various electrical area, such as underground cable fault locating system, power transformer test, AC/DC Hipot test, Insulation resistance test and so on. With rich measurement experiences of innovation combining and advanced technology to provide the most reliable electrical measurement. The design development production and Inspection is performed at the ISO 9001 and CE which gurantee a consistency of high quality products. XZH TEST masters a variety of technologies as well as extended service and support to deliver the highest value to our customers. We sincerely hold the tenet of "quality first, customers supreme, honor commitment trust worthy".Stays commitment R&D about electric power detection equipment and electric power automation, since its foundation, the company keeps living up to the belief of: "Create high-quality brand, casting first-class enterprise image". Also, we make the "steady development, the best quality "as the core concept of the enterprise. Our goal is to provide our customers with reliable test and measurement equipment that more safe and easy to use, we make measurement easier! Xi'an Xu & Hui Electromechanical Technology Co., Ltd expect to strengthen the relationship with world-wide cooperators, and warm-heartedly welcoming business partners to visit our factory for developing the OEM & ODM win-win Cooperation. Our Team Factory scene We have the ability to innovate new products and technologies. We can provide complete system solutions for your project. We provide online and offline practical and theoretical training. We provide instrument repair and calibration. Certification
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Science Popularization Mini-Lesson: Measurement using a Smart Digital Resistance Meter 2025-12-23 Intelligent Digital Resistance MeterMeasuring the DC resistance of conductors using the bridge method is cumbersome and inefficient.  However, using a DMM (digital multimeter) or an intelligent digital resistance meter to measure DC resistance is fast, has a wide measurement range, and is easy to operate, making it widely used. The measurement range is 10⁻⁷ to 10⁶ Ω, with accuracy levels of 0.25, 0.05, and 0.02. The diagram shows the principle block diagram of a smart digital resistance measuring instrument. The figure shows the measurement principle circuit of one type of instrument, also known as the voltage drop method.  Because the resistance being measured is small, the influence of lead and contact resistance must be considered. Therefore, this instrument uses a four-wire measurement method. In the diagram, P1 and P2 are the voltage terminals, and C1 and C2 are the current terminals. To improve the instrument's resolution and increase its measurement range, an adjustable constant current source is typically used.  For small resistances, the current I is increased as much as possible, and a 16-bit or 24-bit high-precision A/D converter is employed. Considering the instability of the constant current source, the circuit samples and analyzes the input current and voltage signals almost simultaneously using the A/D converter. The entire instrument operates under the control of a CPU, and the resistance value is finally displayed in digital form. The figure shows the external appearance of several intelligent digital resistance measuring instruments. Testing Precautions: When using the four-terminal method for measurement, be sure to follow the wiring method shown in the diagram (internal measurement method): the two voltage terminals should be on the inside, and the two current terminals on the outside.  The other end of the cable, connecting to the three phases and ground, must be reliably connected using thick, short copper wires.
Science Education Mini-Lesson: The Bridge Method (for measuring electrical resistance) 2025-12-23 Single-arm bridge: The principle is shown in the figure. In the figure, R1 and R2 are standard resistors, and R3 is a variable resistor. Adjust R3 to balance the bridge, so that the current flowing through the galvanometer IG = 0, i.e., UA = UB. At this time, I2 = I3, IX = I1, I3R3 = IXRX, and I2R2 = I1R1.  Therefore, RX = R1/R2 * R3. In practice, due to the resistance of the connecting wires to RX, the single-arm bridge cannot be used for measuring small resistances.  Furthermore, the regulations stipulate that the connecting wire resistance should not exceed 0.2% of the measured resistance value; if it exceeds this value, correction is required. There are many models of single-arm bridges, such as QJ-23, QJ-24, QJ-49, QJ-57, and QJ-67, with a measurement range of 1-108Ω and accuracies of 0.2, 0.1, and 0.05/0.01 levels. The figure shows the appearance of several DC single-arm bridges. Double-Arm Bridge: Single-arm bridges are only suitable for measuring DC resistances greater than 1Ω. For measuring DC resistances less than 1Ω, a double-arm bridge can be used, the principle of which is shown in the figure. In the figure, the measured resistance RX and the standard resistance RN are connected using a four-terminal connection. C1, C2, C3, and C4 are current terminals, and P1, P2, P3, and P4 are voltage terminals. When the bridge is balanced, IG=0, I1=I2, I3=I4, I1R=IRX+I3R’, I2R1=IRN+I4R2, R=R’, R1=R2, RX=R/R1*RN.  There are many models of double-arm bridges, such as QJ-42, QJ-44, QJ-19, and QJ-65, with a measurement range of 10⁻⁶ to 11Ω and accuracies of 0.2, 0.05, and 0.02 grades.  Single and Double Arm Bridges These bridges combine the functions of both single-arm and double-arm bridges, offering a wide measurement range, typically between 10⁻⁶ and 10⁷ Ω.  Examples include the QJ-31, QJ32, QJ36, and QJ47 models, with accuracies of 0.1, 0.05, and 0.02 levels, as shown in the figures below, which illustrate the external appearance of several types of DC single and double arm bridges.
Scientific information about cable conductors 2025-12-18 The cable conductor is one of the most important components of a power cable, including the conductor core, metal shielding layer, and metal sheath. In practice, we are most concerned with the conductor core and the metal shielding layer. All grades of power cables must have a conductor core, usually made of high-purity copper or aluminum. The conductor cross-section can be circular, elliptical, sector-shaped, or hollow circular. Small cross-section conductors are generally composed of a single wire, while larger cross-section conductors are composed of multiple strands of wire twisted together. Cables of medium and high voltage grades have a metal shielding layer, and some low-voltage cables with special requirements also have a metal shielding layer. For rubber and plastic power cables, the metal shielding layer is usually made of copper wire or copper tape. Basic Measurement Principle As shown in the figure, a DC power supply E is applied to both ends of the resistor under test. By measuring the circuit current I and the voltage U across the resistor under test, the resistance value RX can be measured using Ohm's law R=U/I. In practice, since the resistor under test RX is a cable conductor, its resistance is small, usually below a few ohms. To eliminate the influence of the voltage and current meter leads and their contact resistance with the resistor RX on the test results, two measurement methods are generally used: the bridge method and the four-terminal constant current method.
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