Common faults and maintenance of 721 spectrophotometer
1. Breakdown phenomenon: When zero adjustment, the µA meter is normal, and when the adjustment is 100%, the A meter indication is also normal, and only 100% indication is infinity for about 20 minutes after starting. Turn off and then on again, and repeat the above phenomenon.
Analysis and maintenance: The fault is obviously a soft fault in the line. The instrument is composed of three parts: an amplifier power supply circuit, a tungsten lamp voltage stabilizer circuit and an amplifier circuit. When zero calibration? A meter is normal, indicating that the amplifier circuit is normal. Therefore, consider the failure of the tungsten lamp voltage regulator circuit. First check whether the 100% adjustment potentiometer W2 is intact. The potentiometer is a multi-turn potentiometer on the instrument control panel. The resistance value measured with a multimeter is continuously adjustable, indicating that the potentiometer is intact. By adjusting W2, the reference voltage of the regulated power supply can be changed. The reference voltage is passed through the integrated operational amplifier 5G23A PP Cutlery is perfect for fast paced food, on the go meals, dinner party,wedding ceremonies, birthday parties, restaurants, hotels or snacks. Our products cover PP cups, PP Spoon, PP Fork and PP knife. The raw material is food grade PP, which is clean and hygienic. And the products are with smooth surface and impeccable in looks with classy design, they could be loose packing or individual packing with your LOGO or design printings.
PP Cutlery
PP Spoon,PP Fork,PP Cup,Napkin Spoon
BILLION PLASTIC MANUFACTURING CO.,LTD, JIANGMEN , https://www.billion-plastics.com