The grounding shaker is also called a grounding resistance shaker, a grounding resistance meter, and a grounding resistance tester. The grounding shaker is divided into the traditional hand-operated and battery-driven according to the power supply mode; the grounding shaker is divided into the pointer type and the digital type according to the display mode; the grounding shaker is divided into the pile type and the clamp type according to the measurement mode. At present, the traditional hand-cranked grounding table is almost unmanned, and the pointer type or digital grounding table is popular. In the power system and the telecommunication system, the clamp type grounding table is popular.
The shaker, also known as the megohmmeter, is a meter used to measure the insulation resistance and high value resistance of the device under test. It consists of a hand-cranked generator, a meter head and three terminals (ie l: line end, e: ground) End, g: shield end).
1. Selection principle of the shake table (1) Selection of rated voltage level. Under normal circumstances, equipment with rated voltage below 500v should use 500v or 1000v shaker; for equipment with rated voltage above 500v, use 1000v~2500v shaker.
(2) Selection of the resistance range. There are two small black dots on the dial scale of the shake table, and the area between the small black dots is the accurate measurement area. Therefore, when selecting the meter, the insulation resistance value of the device under test should be within the accurate measurement area.
2. Use of shake table (1) School table. Before the measurement, the shaker should be tested for open circuit and short circuit to check whether the shaker is good. Open the two connecting lines, shake the handle, the pointer should be at the “∞â€, then short the two connecting lines, the pointer should be at “0â€, it is good if the above conditions are met, otherwise it can not be used.
(2) The device under test is disconnected from the line, and the large capacitance device is also discharged.
(3) Select the shake table that meets the voltage level.
(4) When measuring the insulation resistance, generally only use the "l" and "e" terminals, but when measuring the insulation resistance of the cable to the ground or the leakage current of the device under test is serious, the "g" terminal should be used, and The "g" terminates the shield or casing. After the line is connected, turn the handle clockwise. The speed of the shaking should be slow and fast. When the speed reaches 120 rpm (zc-25 type), keep rotating at a constant speed, read after 1 minute, and While reading while shaking, you cannot stop reading.
(5) Disassembly and discharge. After the reading is completed, while slowly shaking, disconnect the line and then discharge the device under test. The discharge method is to take the ground wire used for the measurement from the shake table and short-circuit it with the device under test (not the shake table discharge).
4. Precautions (1) It is forbidden to measure the insulation resistance during lightning or near high-voltage equipment, and only when the equipment is not charged or inductive.
(2) During the shaking test, no one can work on the device under test.
(3) The shaking table wires cannot be twisted together and should be separated.
(4) It is strictly forbidden to touch the hand before the shake table has not stopped rotating or before the device under test is not discharged. Do not touch the metal part of the lead when disconnecting the wire.
(5) At the end of the measurement, discharge is required for the large capacitance device.
(6) Regularly verify its accuracy.
The shaker, also known as the megohmmeter, is a meter used to measure the insulation resistance and high value resistance of the device under test. It consists of a hand-cranked generator, a meter head and three terminals (ie l: line end, e: ground) End, g: shield end).
1. Selection principle of the shake table (1) Selection of rated voltage level. Under normal circumstances, equipment with rated voltage below 500v should use 500v or 1000v shaker; for equipment with rated voltage above 500v, use 1000v~2500v shaker.
(2) Selection of the resistance range. There are two small black dots on the dial scale of the shake table, and the area between the small black dots is the accurate measurement area. Therefore, when selecting the meter, the insulation resistance value of the device under test should be within the accurate measurement area.
2. Use of shake table (1) School table. Before the measurement, the shaker should be tested for open circuit and short circuit to check whether the shaker is good. Open the two connecting lines, shake the handle, the pointer should be at the “∞â€, then short the two connecting lines, the pointer should be at “0â€, it is good if the above conditions are met, otherwise it can not be used.
(2) The device under test is disconnected from the line, and the large capacitance device is also discharged.
(3) Select the shake table that meets the voltage level.
(4) When measuring the insulation resistance, generally only use the "l" and "e" terminals, but when measuring the insulation resistance of the cable to the ground or the leakage current of the device under test is serious, the "g" terminal should be used, and The "g" terminates the shield or casing. After the line is connected, turn the handle clockwise. The speed of the shaking should be slow and fast. When the speed reaches 120 rpm (zc-25 type), keep rotating at a constant speed, read after 1 minute, and While reading while shaking, you cannot stop reading.
(5) Disassembly and discharge. After the reading is completed, while slowly shaking, disconnect the line and then discharge the device under test. The discharge method is to take the ground wire used for the measurement from the shake table and short-circuit it with the device under test (not the shake table discharge).
4. Precautions (1) It is forbidden to measure the insulation resistance during lightning or near high-voltage equipment, and only when the equipment is not charged or inductive.
(2) During the shaking test, no one can work on the device under test.
(3) The shaking table wires cannot be twisted together and should be separated.
(4) It is strictly forbidden to touch the hand before the shake table has not stopped rotating or before the device under test is not discharged. Do not touch the metal part of the lead when disconnecting the wire.
(5) At the end of the measurement, discharge is required for the large capacitance device.
(6) Regularly verify its accuracy.
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