What are the requirements for measuring the insulation of the equipment?
Shaking tableShake table also called megohmmeters, is used for insulation resistance measuring equipment and high resistance meter, which is composed of a hand generator, the header and three terminals (L: E: line terminal, a grounding terminal, G: end shield) composition.
Selection principle of shaking table(1) selection of rated voltage level. Under normal circumstances, rated voltage below 500V equipment, should choose 500V or 1000V shaking table; rated voltage of more than 500V equipment, choose 1000V~2500V shake table.(2) selection of range of resistance range. There are two small black dots on the dial scale of the shaking table, and the area between the small black points is the exact measuring area. Therefore, in choosing the meter, the insulation resistance value of the equipment under test shall be in the exact measuring area.
Use of shaking tables(1) school form. Shake the watch before and after an open circuit and short circuit test to check whether the shaking table is good. Open the two connection line, shake the handle, the pointer should be at "" "" "" "", and then the two connection short answer, the pointer should refer to "0", in line with the above conditions are good, otherwise, can not be used.(2) the tested device is disconnected from the circuit, and the discharge of the large capacitive device is also required.(3) choose a shaker with voltage rating.(4) measurement of insulation resistance, generally only "L" and "E", but in the end, the leakage of cable measurement of insulation resistance of the device under test or flow is serious, you should use the "G" side, and the "G" terminal shielding layer or shell. The line is connected, can rotate in a clockwise direction crank rocking speed should be slow and fast, when the speed reaches about 120 revolutions per minute (ZC-25), keep rotating at a constant speed, 1 minutes after reading, and shaking while reading, not stop reading.(5) discharge with stitches. After reading, while the slow roll side stitches, then the measured discharge equipment. The discharge method is to take the ground wire measured from the shaking meter and then connect it to the device to be measured (not the discharge of the meter).
