Basic information
Chinese name
Resistance tester
Foreign name
Resistance tester
use
Electrical safety inspection, etc.
catalogue
Entry catalogue
Brief introduction of resistance tester
brief introduction
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brief introduction
Resistance tester is an indispensable tool for electrical safety inspection and grounding project completion acceptance. Comprises a grounding resistance tester, an insulation resistance tester, a direct current resistance tester, a surface resistance tester and a loop resistance tester. The loop resistance tester (RX transformer loop resistance tester) is suitable for testing the contact resistance of high and low voltage switches and high and low voltage piezoelectric main contacts.
Control panel diagram of resistance tester
DC resistance of cable lines, etc. The intelligent loop resistance tester uses 100A constant current output. The maximum output voltage is 10V (2-3 times that of conventional instruments), and the test line with thin carrier surface can be used, which greatly reduces the labor intensity of field testers. The test process is controlled by single chip microcomputer and automatically executed, with high precision, good repeatability, single key operation and simple operation, and the test data is displayed on LCD. Suitable for different working environments. Grounding resistance tester is a common instrument for testing and measuring grounding resistance. Due to the rapid development of computer technology in recent years, the grounding resistance tester has also infiltrated many microprocessor technologies, and its measuring function, content and accuracy are incomparable with ordinary instruments. DC resistance tester is a new generation of transformer DC resistance tester, which can automatically select the test current according to different types of power transformers and display the test results at the fastest speed. The DC resistance tester has the functions of storage, printing and discharge indication. It has a built-in power-on memory, which can store measurement data for a long time. The adoption of LCD makes the instrument have a good man-machine interface, and it is the first choice for DC resistance testing.
Scope of application: used to test DC resistance of transformers, motors, transformers and other equipment (the test speed is fast and the test results can be printed intuitively). To use the surface impedance to be measured, please put the measuring instrument on the surface to be measured, press and hold the red test button, and the continuously lit light-emitting diode (LED) will display the measured surface impedance. 103= 1 kOhm green LED 104= 10 kOhm green LED 105= 100 kOhm green led106 =1. 00 ohm yellow LED 109 = 1000 ohm yellow led1010 =100000 ohm yellow led101=/. 10 12= insulation red LED measurement. Insert the grounding wire into the grounding socket, so as to insulate the detection electrode on the right side of the instrument (the same side as the socket). Clip crocodiles to your ground line. Place the measuring instrument on the surface to be measured, press and hold the test button, and the LED that continuously emits light indicates the resistance to ground. The unit of this measurement is ohm. The conversion point of the impedance value is 1/2 logarithm, that is, 3. 16× 10n, and the linear value of the conversion point is 10% of the unit average of each measuring file. Measuring instrument: decimal resistance box. The resistance of the electrode resistance box needs to be 1× 103 ohm to 999× 106 megohm or 109 ohm. When measuring the resistance value greater than 109, cad generation technology is adopted, because it is difficult to verify whether the resistance value is greater than 999 by driving with 9 volts. Connect the two electrodes of the resistance box to the two parallel electrodes of ACL-380, and adjust the resistance to the position of1k. The LED of 103 of the instrument should be on, and the calibration of other gears should be analogized. When measuring the impedance transition point, continuously adjust the impedance value of the impedance bridge while pressing the switch, and observe the impedance value of the next LED lamp when it is always on (the value at this time is the transition impedance value). Main parameters Power supply: 9V PP3 alkaline battery Measurement voltage: 9V temperature range: working temperature 5℃ to 49℃ Storage temperature:-15℃ to 60℃ Relative humidity: 0% to 90% (non-condensing state) Measurement degree: 10 order of magnitude transition point: 1/2 logarithm. Different models of ZC shaker have slightly different shapes and structures, but the use methods are basically the same. The measuring instrument is also equipped with two grounding probes and three wires. The use method and measuring steps are as follows: (a) grounding resistance tester; (b) connecting wires; (c) measuring grounding rod 1; disconnecting the connection point between grounding trunk line and grounding body, or disconnecting the connection points of all grounding branches on grounding trunk line. 2. Insert two grounding rods 400mm deep underground, one 40m away from the grounding body and the other 20m away from the grounding body. 3. Place the shaking table in a flat place near the grounding body, and then connect it. (1) Connect the terminal E on the instrument and the grounding body E of the grounding device with a connecting wire. (2) Connect the wiring post C on the electric meter with the grounding rod C 40 meters away from the grounding body with a connecting wire. (3) Connect the wiring post P on the table with the grounding rod P which is 20m away from the grounding body with a connecting wire. 4. Adjust the coarse adjustment knob (there are three adjustable ranges) according to the grounding resistance requirements of the grounding body to be measured. 5. Shake the table evenly at a speed of 120 rpm. When the pointer deflects, immediately adjust the micro dial until the pointer is centered. Multiply the reading set by the micro dial by the coarse positioning multiple, which is the grounding resistance of the grounding body to be measured. For example, if the fine-tuning reading is 0.6 and the positioning multiple of the coarse-tuning resistor is 10, the measured grounding resistance is 6 Ω. 6, in order to ensure the reliability of the measured grounding resistance, should change the orientation for retest. Take the average of several measured values as the grounding resistance of grounding body. Surface introduction Surface resistance tester (ACL-800 megohmmeter) measures impedance temperature and humidity. "Humidity and temperature will affect the impedance, so it is necessary to measure." Measure the surface impedance of 10- 10 ohm /□ and the resistance of 10- 10 ohm.