Terms Relating to Balance Functions & Mechanisms
Nickname of a Shimadzu precision balance. "LIBROR" is coined from Libra, the seventh sign of the Zodiac. Since the time it became a registered trademark in 1950, it has become such a familiar name that everyone has mistakenly thought it was a balance made by LIBROR Co., Ltd.
By this function, the balance senses changes in outside air temperature that affect sensitivity, and the balance itself automatically startscalibrationusing its own internal weights. As a result, the operator can conduct measurement stably at all times without needing to worry about sensitivity calibration.
A set of standards used for controlling data exchange between a device and a PC. If a balance is compliant with this standard, it can be controlled from a PC and data can be sent to the PC from that balance. (Note, however, that communications software is required separately if the balance does not support the Windows®Direct Function.) The Windows®Direct Function is provided as standard in addition to the I/O mechanism (interface) on the BX/BW and AW/AX/AY series.
A function for capturing data from a balance on an application, such as Excel, running in Windows® via an RS-232C cable connected to a PC. This does away with the need for communications software for capturing data on the PC. (Patent acquired)
* To use USB ports, a separate conversion kit is required and a driver must be installed. Special attention is required for compatibility with the Windows® Vista OS. For details, click here
Standard units (weights) are used to obtain the relationship between the indicated values of a measuring instrument (balance) and their true values. "Calibration" means two things, "inspection" and "correction." Inspection involves judgment by comparing the size of the error of measured values with pre-determined correction limits, while correction involves re-application of a scale after having judged that the current indicated value is not reliable. Generally, "calibration" means the latter in most cases.
A balance designed with built-in calibration weights that allows sensitivity to be calibrated easily through simple button operation. Shimadzu has also incorporated the PSC functionand clock CAL function, that enable the balance itself to automatically judge the calibration timing and actually perform calibration, to make calibration even more convenient.
A mechanism provided for electric balances categorized asspecific weighing equipmentthat has built-in calibration weights to enable the influence of gravitational acceleration to be corrected. When the scale interval number (weighing capacity/scale interval) exceeds 6000, the balance must be tested where it is to be used. However, this test is not required on balances that have this mechanism since self-correction can be performed in situ.
This type of balance can delete tare, and switch to a smaller range with an additional digit, if the sample is within the weighing capacity range (large range). This feature can be conveniently used, for example, when mixing and blending very small amounts of samples in large containers.
Balances with this function have a clock function and built-in motor-driven weights that enables the balance itself to start calibration at a preset time using the built-in weights. This function allows calibration to be performed automatically at times, such as before start of work, during lunchtime or in the early evening, that will not interfere with measurement.
This is also called the electromagnetic equilibrium method or electromagnetic compensation method. With this method, the weight of the object to be measured is balanced by electromagnetic force, and the weight (mass) of the object is detected from the size of the current generated. This is the mainstream method for high-precision balances.
By this method, weight is detected using a load converter (load cell), that outputs signals corresponding to the mass or force that is applied. Though resolution is about 1/10000 at maximum, this method is used for balances that require only moderate accuracy (resolution) due to its simple, rigid structure. An intermediate tuning fork type also is available.
Calibration that can be performed very simply on balances with built-in motor driven weights just by button operation.