(1) Check and adjust the horizontal position of the balance.
(2) Check and adjust the zero point of the balance. Adjust the digital windows and the micro-reading wheel index to "0", turn the power switch upward, and turn the stop handle forward (operator direction) evenly and slowly 90°, the balance In the "full open" state, read the zero point after the balance stops swinging, and turn the zero adjustment knob so that the 00 scale line on the projection screen is in the middle of the clamping line.
(3) Weighing method When the balance is closed, put the object to be weighed in the center of the weighing pan, and gently rotate the stop handle backward about 30°. ” state, carry out weight reduction, and turn the 10~90g hand button one by one. When the scale shifts from positive to negative, it means that the weight indication value is too large, and a number should be returned, and then adjust the middle hand button (1~9g) and small knob (0.1~0.9g). It is better to weigh the object on the platform scale first, know the approximate mass of the object to be weighed, and then subtract the corresponding weight. For example, when weighing an object with a mass of 54.3421g, turn the big hand button from 10g to 50g, and the micro-marker image on the projection screen will be inserted into double lines with positive numbers. Between 50~60g, return the handle button to the 50g position, follow the above operation, turn the middle handle button and the small handle button, and make sure that the minus size handle button is properly placed at 54.34, and the weight of the object is between 54.34~54.35g. Turn off the balance, and then slowly turn the stop handle 90° forward, that is, the balance is in the "full open" state. When the movement of the micro mark stops, if it is between 42~43 mg, turn the micro read handle so that the 42 scale is clipped into the Double lines, the reading of the micro-reading wheel is 1.5, which means that the weighing result is 54.34215g. According to the effective digit selection rule, it can be read as 54.3422g.
If the variability of the balance used is that 1 division of the micro-reading mechanism is equivalent to 0.1 mg, although the reading of the micro-reading mechanism can read 0.05 mg, it is meaningless to express the weighing result to 0.05 mg, so the amount of the substance is called It is 54.3422g. Of course, it is okay to reserve one more digit for reference during the weighing process.
