... 50HZ, power supply voltage fluctuations not more than ±10%, power capacity not less than 0.5KVA, have a good grounding, ... grounding resistance of less than 4Power lines may not have welding, high frequency ... samples stage with a load-bearing track, can weigh 1-30kg,2-6 inches in diameter(can be ... track, and add a V-bearing guide, can weigh 1-30 kg, 2-6 inches in diameter ( ...