How to use a laboratory electronic balance

The six steps of using the balance: 1.
Place the horizontal table; 2.
Return the travel code to zero; 3.
Use the balance nut to adjust the pointer to the center; 4.
Place objects on the left plate and weights on the right plate; 5.
Display the weights The number plus the reading of the upstream code reads out the quality of the object; 6.
Arrange the instrument
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The use of the balance can be memorized by the following formulas: 1.
The balance should be leveled first, the travel code should be reset to zero when left, the needle should be rotated to the center, the left and right code should be recorded, the weight should be taken with tweezers, wet and liquid should be used The container is said to move the yardage first and then the small one, and the two yards should be added together
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2.
To measure the quality, use a balance, first level it, then level it, move the travel code to the left to zero, and use the nut to level it.
The left and right size should be recorded
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The balance is used to measure the mass of objects, and is also called a tray balance in a narrow sense (a tray balance is often used in the laboratory)
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Commonly used balances with low accuracy are composed of trays, pointers, beams, rulers, runners, weights, balance nuts, and indexing plates
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The graduation value is generally 0.
1 or 0.
2 grams
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A balance is a weighing instrument
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It is made according to the principle of leverage, with a fulcrum (axle) supporting the balance beam in the center of the beam to form two arms.
Each arm is hung with a plate, one of which is placed with an object of known weight, and the other is placed in the other plate.
For the object to be weighed, the deflection when the pointer fixed on the beam does not swing and points to the middle scale is the weight of the object to be weighed
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Precautions for use: 1.
It should be placed in a horizontal place
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2.
The balance should be balanced left and right before use (the travel code must be set to "0" and the balance nut should be adjusted in the opposite direction, using the formula: left high, left adjusted)
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3.
The weights cannot be held by hand and should be picked up with tweezers
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Do not get the weights wet or dirty (this will cause the weights to corrode and rust, the weights will become larger, and the measurement results will be inaccurate)
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4.
The quality of the measured object cannot exceed the scale range or lower than the minimum scale of the balance travel code
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5.
Wet objects and chemicals should not be placed directly on the pan of the balance
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6.
Pay attention to the left and right code when measuring (the indication value of the travel code is based on the left-aligned tick mark)
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7.
After weighing, reset the travel code to zero, and put the weight back into the weight box with tweezers
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