The following grounding resistance testers are available in the market:
1 and BY257 1 digital grounding resistance tester.
2.GY3 18 Double Claw Grounding Resistance Tester.
3.GY3 15 clamp grounding resistance tester.
4.GYDW-II grounding resistance tester.
How to use the resistance tester;
1) Be familiar with the instruction manual of the grounding resistance measuring instrument, and fully understand the structure, performance and usage of the instrument.
2) Prepare tools and all instrument accessories needed for measurement, wipe the instrument and grounding probe clean, especially the grounding probe, and be sure to clean the dirt and rust spots on its surface that affect the conductivity.
3) Disconnect the connection point between the grounding trunk line and the grounding body or the connection points of all grounding branches on the grounding trunk line, so that the grounding body is separated from any connection relationship and becomes an independent body.
Resistance measurement:
This measurement method is used to measure the surface resistance between one point on the surface of an object and another ground point on the surface. The measurement method conforms to EOS/ESDS4. 1 measurement standard.
A, insert one end of two connecting wires into two 3.5mm jacks of the instrument respectively, and then connect one of them with a crocodile clip and the other with a 5-pound disc probe.
B, connect the alligator clip to the known grounding point, and place the disc probe on the surface of the measured object according to the measurement requirements.
C, press the measurement button until the values of resistance, relative humidity and temperature are displayed on the display screen, and the measurement results meet the measurement standards of EIA, EOS/ESD, ANSI, IEC-93, CECC and ASTM. In order to ensure high-precision measurement results, care must be taken not to overlap the two wires, and not to touch the probe, wires and the measured object with your hands.
Refer to the above content: Baidu Encyclopedia-Resistance Tester
What is the DC resistance tester used for?
1 introduction of DC resistance tester
DC resistance test of electrical equipment is a convenient and effective test to check winding insulation and current loop connection. By measuring DC resistance, we can check the welding or connection quality of the lead, whether there is turn-to-turn short circuit or open circuit in the winding, and whether the contact of the tap changer is good.
According to GB26860-200 1 Code of Practice for Electric Power Safety, DC resistance test must be carried out during transformer handover, overhaul, minor repair, change of tap position and preventive test.
In the past, single-arm and double-arm bridges were used to measure the mainstream resistance. The measuring current of this bridge is mA, which takes a long time and has low accuracy. The appearance of current resistance tester completely shortens the measurement time and effectively reduces the workload of testers.
In addition to excellent performance, good reliability and convenient use, the DC resistance tester can also be used to measure the voltage of 1μV~2V and test the winding resistance of small motors and transformers. It is widely used in laboratories, industrial and mining sites and other places, and is an extremely ideal DC resistance measuring instrument.
2, the characteristics of DC resistance tester:
The measurement speed is fast and the test data is accurate.
Brand-new power supply technology, wide test range
High-speed single chip microcomputer control, fast response and high degree of automation.
Brand-new technology, small size, light weight and easy to carry.
Good interactivity, simple operation and easy use.
What is the name of the instrument for measuring resistance?
Instruments used to measure insulation resistance are:
1, megger, megger is also called insulation meter, high voltage insulation resistance tester, insulation resistance tester, insulation characteristic tester and so on. It is mainly used to check the insulation resistance of electrical equipment, household appliances or electrical lines to ground and phase. According to different products, the megohmmeter selects different voltage levels such as 100V, 250V, 500V, 1000V to measure its insulation resistance.
2. Multimeter. Multimeters can be used to measure the resistance of equipment components. When measuring the insulation resistance with a multimeter, it should be set to the ohm range, generally: x 1, x 10, x 100, x 1000.
In addition to measuring resistance, multimeter can also be used to measure DC current, DC voltage and AC voltage. Some can also measure AC current, capacitance, inductance and transistor amplification. It is an indispensable general tool for electronic engineering, electromechanical and maintenance departments, and is widely used in electrical measurement.
Extended data:
Electrical equipment such as motors, cables and household appliances. Heat and moisture, aging of insulation materials and reduction of insulation resistance cause leakage or short circuit accidents of electrical equipment. Therefore, in electrical installation, maintenance and testing, it is necessary to conduct insulation tests on motors, electrical appliances and power supply lines on a regular basis.
There are usually two ways to detect common insulation resistance: low voltage measurement and high voltage measurement. The multimeter measures low voltage, and the megger measures high voltage. However, there is some error in measuring insulation resistance with universal electricity. For aging insulation materials, it may be insulated when measuring battery voltage with multimeter; However, under the normal voltage of 220V, leakage may occur.
This is because the resistance of insulators is different under different voltages, and insulators will also conduct electricity in some cases. For example, some woods are insulated at 220 volts, but conduct electricity at 10 kV.
Therefore, the measured value at low voltage cannot reflect the real insulation resistance at high voltage. Megohmmeter is used to simulate the measurement of insulation resistance of materials at a certain voltage level. Therefore, it is the most commonly used instrument to measure the insulation resistance of electrical equipment.
Baidu encyclopedia-megohmmeter
Baidu encyclopedia-multimeter
How to use the insulation resistance tester, how to use it?
Insulation resistance tester is an instrument which is widely used in the process of power testing by using voltage to excite the tested equipment or network and ohm's law. Resistance measurement is also an important test item. So what are the use methods and testing standards of insulation resistance tester? Today, Huayi Power will give you detailed answers below.
first step
Before the insulation resistance tester is used safely, the battery must be charged before the insulation resistance tester is unpacked, and the battery charging time is not less than six hours. Charging the battery before safe use can not only ensure that the grounding resistance meter will not be damaged due to excessive working current caused by safe use, but also ensure the normal management of the grounding resistance meter and the accuracy of construction engineering measurement.
Step two:
When using the insulation resistance tester safely. 1. Just after the safe use of the differential insulation material resistance tester, lightly press the power control switch of the host, and the indicator light of the control switch of the insulation detection resistance tester will light up. 2. After the indicator light is on, the insulation resistance tester will complete the self-inspection of the whole equipment. At this point, the instruction manual will often appear on the display screen of the absolute resistance tester, which will complete the next stage of operation. 3. Press the "Working Voltage Selection Button" to select according to the required working voltage. 3. Press the "detection key" lightly, and the detection system has just started. Once the test is just started, it means that the light is on _ voltage, accompanied by a beep for one second. When the beep can be fixed continuously, there is a high voltage input at the front end of the grounding resistance meter.
Step 3:
After the insulation material resistance network tester is used safely. After the test is completed, the test results will be displayed on the grounding resistance display. When the "detect button" is automatically pressed again in the second detection, the grounding resistance measuring instrument will stop the previous _ voltage output and estimate and display the detection result again.