1 What is a load cell and how does the load cell in the balance work? The electronic balance that is essential in daily experiments is a precision instrument. Such deformation may be caused by the weight of the object or the downward force, and the load cell converts the physical deformation that is difficult to observe with the naked eye into a quantifiable electrical signal. 2 It is well known that changes in temperature can cause thermal expansion and contraction of an object. This phenomenon is called thermal expansion and contraction. 3 To ensure the most reliable results for every weighing of an electronic balance, we must reduce the effects of environmental changes. Balance calibration is such a necessary means. 4 This is the internal calibration or internal adjustment function that comes with the balance. AutoCal AutoCal - is an automatic calibration mechanism that OHAUS uses to embed an internal calibration function into the balance. It has a higher level of intelligence and automation than the normal internal calibration function. AutoCal automatic calibration live Function review Stamp video, 1 Explorer series 2 Adventurer AX Series Ohaus Small Lecture Hall | PX Series Balance Static Elimination Guide! If you want to know more about Ohaus's electronic balance and laboratory weighing products , please call the Ohaus sales service line "4008-217-188" or enter "Request Information" to leave your information, our Professional engineers will be happy to help you! Â â–¼ Automatic Massage Foot Bath Machine
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The experimenters know that the rigor of the experiment and the normativeness of the research require the experimenter to carefully maintain each experimental instrument.
The daily maintenance of the electronic balance is an essential preheating and calibration before each use.
Why is the calibration of an electronic balance so important?
This article will explain the principle and necessity of balance calibration from the characteristics of the internal structure of the balance , and introduce you to the AutoCal automatic calibration function of OHAUS electronic balance and its advantages .
The load cell is the core electromechanical device in the electronic balance and is also a metal object.
When it is applied with a load, deflection or bending occurs. But this overall change is very small.
The following figure is an example, shown as a simple electromagnetic force compensation load cell. The left picture is the no-load state, and the right picture is the load status.
By illustration, we can see that the load cell causes bending or deflection after the load is applied. 
Is the thermal expansion and contraction of metal negligible?
From a physics point of view, all the objects we touch every day, whether solid, liquid or surrounding gas, are made up of tiny particles called atoms.
In solids, atoms are arranged in a specific way and are not allowed to move too much. However, when a substance is heated, energy is absorbed. This absorbed energy increases the kinetic energy of the atoms that make it up, which in turn causes the atoms to take up more space and thus expand the object. Conversely, when heat is removed, the kinetic energy stored in the atoms of a given material is reduced, so the material shrinks.
In general, the expansion and contraction of materials such as metals is almost negligible and has no consequences. However, in high-precision applications, even very small thermal expansion and contraction can pose challenges.
The electronic balance is very precise and sensitive. Under the non-working conditions, the subtle changes in the external environment will also cause the load cell to bend and deflect.
Why do I have to calibrate?
Calibration, ie applying known mass, checks if the measured value matches the actual (known) value.
Calibration (sometimes) is done using an external weight, but external calibration has several drawbacks:
What is internal calibration?
Internal calibration is a mechanism built into the balance consisting of a motor and one or more weights of known mass inside the balance.
The user can initiate a process in which the internal weight is automatically loaded into the load cell and the measured value is checked against the expected value.
If these values ​​are different, the balance will adjust itself to obtain the correct measurement for a given load. 
The internal calibration mechanism eliminates the need to purchase and maintain external weights and is usually more efficient than external adjustments.
OHAUS balance automatic calibration function
Electronic balances with AutoCal function for self-monitoring.
Internal calibration is automatically triggered when the AutoCal mechanism detects a temperature change or reaches a set auto-calibration interval. 
The balance will be automatically calibrated during off hours
AutoCal's automatic calibration mechanism ensures that the balance maintains accurate weighing service in the current environment and ensures that the balance is ready for daily use.
No need for the balance user to manually calibrate and adjust the balance, saving the experimenter a lot of time and without affecting the smooth progress of the experiment .
Enter the world of OHAUS electronic balances
Learn more about AutoCal features!
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