In order to achieve the object described above, an electronic balance includes a weighing pan, a windshield, door opening and closing mechanisms configured to automatically open and close doors of the windshield, a weight sensor, a built-in weight, a weight applying and removing mechanism for the built-in weight, and a control unit, the control unit measures a standard deviation of the built-in weight as an actual use standard deviation (SDreal) accompanied by a series of opening and closing operations consisting of opening the door by the door opening and closing mechanism, loading the built-in weight by the weight applying and removing mechanism, closing the door by the door opening and closing mechanism, acquiring weighing data of the built-in weight, opening the door by the door opening and closing mechanism, unloading the built-in weight by the weight applying and removing mechanism, and closing the door by the door opening and closing mechanism.

A gravimetric measuring device (10, 10, 10, 10) includes a balance base body (12) and a top unit (14, 14, 14, 14), wherein the balance base body (12) has a balance base body wall (20), to which the top unit (14, 14, 14, 14) can be reversibly fixed, and a weighing system with a load receptor (22) passing through the balance base body wall (20) and the top unit (14, 14, 14, 14). A plurality of optical, magnetic, tactile, radio, thermal, electrical and/or electronic interfaces (201) coupled to a balance electronics are arranged on the balance base body wall (20), at least one of which interfaces is connected to a corresponding interface of the top unit (14, 14, 14, 14) to form an optical, magnetic, tactile, radio, thermal, electrical or electronic connection between the top unit (14, 14, 14, 14) and the balance electronics.

An electronic balance includes: a non-contact sensor including a substrate, a light-emitting element and a light-receiving element, in which the light-emitting element is fixed to a surface of the substrate so as to be directed at a target sensing space, and the light-receiving element is fixed to the surface of the substrate, apart from the light-emitting element, so as to be directed at the target sensing space; and an operation controller configured to control an operation of a predetermined section of the electronic balance according to a detection signal from the non-contact sensor.

A method for operating a balance includes: (a) introducing an ion cloud into a weighing chamber to bring an electrostatic charge state of a weighing sample towards an electrostatic neutral state, (b) detecting the neutral state, and (c) acquiring measured values of a weighing sensor, calculating therefrom a final weighing value representing the electrostatic neutral state, and outputting the final weighing value. When the ionizer is activated, the measured values of the weighing sensor are acquired, preliminary weighing values are calculated from the measured values and the final weighing value is calculated and output after a number of preliminary weighing values have been recognized as stable. During a recognition phase, positive and negative ion clouds are alternatingly generated, and during a neutralization phase, only ion clouds of that sign are generated that, in the recognition phase, had led to the larger changes within the preliminary weighing values.

The electronic balance is configured to be capable of performing the following series of operations (I) to (VII) automatically: (I) The opening and closing mechanism opens the door. (II) The moving up/down mechanism applies the load of the built-in weight to the weighing mechanism. (III) The opening and closing mechanism closes the door. (IV) After a predetermined period of time elapses, the opening and closing mechanism opens the door. (V) The moving up/down mechanism removes the load of the built-in weight from the weighing mechanism. (VI) The opening and closing mechanism closes the door. (VII) The control unit performs zero-point adjustment of the weighed value. Accordingly, operation of preliminary loading is automatically performed, and thus the stability of the weighing accuracy is improved.

The balance includes the double windshield including an inner windshield that covers a weighing pan, and an outer windshield that covers the inner windshield, the respective windshields include sliding doors openable and closable on a lateral surface, a pair of engagement members configured to link sliding doors positioned on the same lateral surface side of the respective windshields so as to move in the same direction are provided, a protrusion is provided on one engagement member, and a recess is provided in the other engagement member, the protrusion is configured to enter into and exit from the recess, when the protrusion enters into the recess, the pair of engagement members is brought into an engaged state, and in such an engaged state, the sliding doors are linked together to be capable of opening and closing simultaneously.