Electronic reading balance

Details Electronic reading balance Electronic reading balance

1980-03-10

1982-09-07

Miller, Jr., George H.

Weighing scales

Computer

Electrical

177185, 364734, G01G 1904, G01G 2310, G06F 728

Patent

active

043479030

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to an improved electronic reading balance composed of an electronic weight detector, a weight measuring amplifier, and other electronic units, capable of electronically processing any measuring data.


BRIEF DESCRIPTION OF THE PRIOR ART

Electronic reading balances are now broadly used in many fields of testing and studying and are also actively used in the fields of medical science and pharmacy for measuring the body weight of experimental animals such as mice in toxic tests, etc.
In this case, however, occasionally an experimental animal whose body weight is being measured moves on the pan of a balance, preventing accurate measurement of its body weight due to vibration caused thereby, so that a combination of weighing means such as an integrator and a voltage/pulse counter are used to take a sampling of data every 0.2 second totalling 10 times in 2 seconds as an example of measuring data and to integrate the information in the output circuit of an electronic reading balance and then a digital average calculating means is used to average the data of 10 times which has been integrated. This information is what is used to measure the body weight of experimental animals.
The movements of animals, however, are random and not suitable for this purpose and their movements fluctuate considerably especially just after giving them medication, causing variations of measurements. For this reason, even if the varying measurements are taken by sampling 10 times per 0.2 second and then averaged to obtain the integrated values as hereinbefore, it is impossible to prevent variations of measurements. Thus, as extremely large values and extremely small values are to be included in the sampling of 10 times, the calculated average value may possibly have a large error.
It has therefore been proposed to take a varying level detection control means with band/pass filters which functions to cut away any measurements over an allowable range of value of variation. Such means, however, may possible be of complicated construction with expensive costs. Further, it is not determining the true average value statistically to cut away the maximum and minimum values without respect of stability of indication. Therefore, adopting the control means does not perform the function as desired.
In electronic reading balances used as quality-control instruments in production lines of factories except for the aforementioned electronic reading balance for weighing the weight of animals, some average calculating means like that aforementioned is provided to prevent the values from being affected by vibration and wind depending on the installation conditions in the factory. Thus, the average calculating means is used to indicate the average value in case the indicative measurement of balance is subject to vibration which will not be settled in a short time, preventing proper reading out and printing out. Also in this case, however, a large error may be involved depending on the degree of external disturbances.


OBJECTS OF THE INVENTION

Accordingly, it is a primary object of the present invention to provide an electronic reading balance capable of solving problems that conventional electronic reading balances have which inevitably indicate erroneous average value differing from the true average value due to some variance of data because the devices contemplated herein function to integrate all the data subjected to sampling of varying measurements caused by any external disturbances such as vibration, etc. during an averaging time and average them to provide the arithmetic average, thus improving the accuracy of measurement of electronic reading balance.
Furthermore, it is other object of the present invention to provide an electronic reading balance capable of making it easier to read out the measurements with higher accuracy.
The electronic reading balance of the present invention functions to make the sampling of measurements in a definite interval of time, memorize them, and compare the newes

REFERENCES:
patent: 4102421 (1978-07-01), Ozaki et al.
patent: 4137568 (1979-01-01), Dlugos
patent: 4231439 (1980-11-01), Hall, Jr. et al.

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