EN
Electronic balance is measured based on the lever principle. When the balance is balanced, the mass of the object is equal to the mass of the weights. On the other hand, electronic analytical balance mostly adopts electromagnetic balance method, as it measures weight and requires calibration to eliminate the effect of gravitational acceleration. When using the balance, first determine if there are issues with the fuse, power switch, power cord, and voltage switch. Check if the transformer has AC voltage input and AC voltage output. If the instrument is equipped with a battery, remove the battery and turn on the AC power supply to determine if the problem is caused by insufficient battery voltage. Next, test if the rectifier circuit, voltage stabilization circuit, and display drive circuit have any abnormalities. If all these are fine, check if the processor and associated circuits are burned out.
If the solid sample being weighed is non-hygroscopic and stable in air, the direct weighing method can be used. First, accurately weigh the mass of a clean container on the balance, then use a spoon to add an appropriate amount of sample to the container and weigh the total mass. Subtract the values of these two masses to obtain the mass of the sample.
Subtractive weighing method is commonly used when weighing on an electronic balance. First, weigh the mass of the sample and the weighing bottle, then pour a portion of the sample in the weighing bottle into the container for the desired quantity. After pouring the sample, cover the weighing bottle, place it on the balance, and weigh its mass. The difference between the two masses is the mass of the sample. If too much sample is poured into the container at once, it must be discarded and re-weighed, and must not be returned to the weighing bottle. If the poured sample is not enough, it can be added again, but the number of times should be minimized.
For samples with relatively stable properties, sometimes a specified mass of the sample is weighed for easier calculation. When using the specified weighing method, place a dish on each side of the balance pan, adjust the balance point of the balance to around the middle scale, then put a fixed mass weight on the left side of the balance pan and add the sample to the right side of the balance pan until the balance point reaches the original value. At this time, the mass of the sample is the specified mass.
A high-precision precision balance is a commonly used teaching instrument that is widely used in laboratories and research fields. This instrument can be used with the direct weighing method. If the solid sample being weighed is non-hygroscopic and stable in air, first accurately weigh the mass of a clean container on the balance, then use a spoon to add an appropriate amount of sample to the container and weigh the total mass. Subtract the values of these two masses to obtain the mass of the sample.
