No load sensitivity: gently unscrew the knob to lower the balance beam, record the zero point of the balance, and then close the knob to lift the balance beam. Use tweezers to take 10mg coil code and place it in the center of the left pan of the balance. Unscrew the knob again, after the pointer is stable (stable and no change), read the balance point reading, close the knob, and calculate the empty disk sensitivity (small grid/mg) and sensitivity (mg/small grid) from the difference between the balance point and zero point.
Ⅰ. Appearance inspection:
1. Take down the balance cover, stack it and place it in an appropriate position, and inspect the weight . Whether the weights in the box are complete, whether the tweezers for clamping the weights are in the box, whether the ring weights are intact and correctly hung on the ring hook, and whether the reading of the reading disk is at zero.
2. If there is dust or other falling objects on the balance pan, it should be cleaned with a soft brush. Analytical balance is an instrument for accurately weighing a certain mass of material. Before weighing, check whether the balance is normal, whether it is in a horizontal position, whether the lifting lugs and ring weights fall off, and whether the inside and outside of the glass frame are clean.
3. Check whether the balance is in rest state and whether the position of balance beam and lifting lug is normal. Electronic balance is used for weighing objects. Electronic balance generally adopts strain sensor, capacitance sensor and electromagnetic balance sensor. Strain sensor has simple structure, low cost, but limited accuracy.
5. Check whether the balance is in the horizontal position. If not, adjust the two horizontal adjusting screws on the foot base under the front of the balance to make the bubbles in the bubble level in the center.
Ⅱ. Sensitivity: The sensitivity of the balance is the small number of grids offset between the balance zero point and the stop point caused by the increase of 1mg weight. The more sensitive the balance is, the more grids offset. The sensitivity is usually expressed by the sensitivity, which refers to the quality required when the pointer is shifted by one grid.
Ⅲ. Zero adjustment: the zero point of the balance refers to the balance point when the balance is unloaded. The zero point of the balance must be measured before each weighing. Electronic balance is used for weighing objects. Electronic balance generally adopts strain sensor, capacitance sensor and electromagnetic balance sensor. Strain sensor has simple structure, low cost, but limited accuracy. After the appearance inspection of the balance is completed, turn on the power supply and turn the lifting knob clockwise to the end (turn on the balance). At this time, you can see that the projection of the miniature scale moves on the light screen. When the scale means that the parts used to indicate the corresponding time in the clock are stable (stable; unchanged), if the scale line on the light screen does not coincide with the 0.00 line of the scale, The zero adjustment rod under the lifting knob can be toggled to move the light screen to make it coincide, and the zero point will be adjusted. If the light screen moves to the end and still cannot coincide with the ruler 0.00 line, please rotate the balance screw on the balance beam to adjust.
Post time: Oct-21-2022