Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01G—WEIGHING
  • G01G23/00—Auxiliary devices for weighing apparatus
  • G01G23/06—Means for damping oscillations, e.g. of weigh beams
  • G01G23/10—Means for damping oscillations, e.g. of weigh beams by electric or magnetic means
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01G—WEIGHING
  • G01G17/00—Apparatus for or methods of weighing material of special form or property
  • G01G17/08—Apparatus for or methods of weighing material of special form or property for weighing livestock
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01G—WEIGHING
  • G01G23/00—Auxiliary devices for weighing apparatus
  • G01G23/18—Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated
  • G01G23/36—Indicating the weight by electrical means, e.g. using photoelectric cells
  • G01G23/37—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting
  • G01G23/3707—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting using a microprocessor

Definitions

• the present invention provides an electronic balance in which an electronic weight detector is built in the balance, a weighing amplifier is added, and the data processing of the measured value can be performed electronically by combining with an electronic peripheral device. It is related to the improvement of
• Electronic balances are widely used in the field of test and research, but are used for toxicity tests and other experiments in laboratory animals (such as rats) in the fields of medicine and pharmacy. It is also widely used in the measurement of the weight of experimental animals. In this case, the experimental animal moves around during the weight measurement, making it difficult to measure accurately due to the vibration.Therefore, the output circuit of the electronic balance must have an integrator and a voltage Z pulse counter.
• the data is sampled 10 times every 0.2 seconds for a certain period of time, for example, 2 seconds, and a means for integrating the data is provided. In general, a method of averaging 10 data accumulated by using a digital average value calculating means is used.
• electronic balances used as quality control measuring instruments in production lines of factories other than the above-mentioned animal electronic balances are subject to vibrations and unavoidable vibrations depending on the installation location at the factory site.
• Means for calculating the average value are provided as described above for wind disturbances, and the indicated value, which normally becomes stable after several damped oscillations, fluctuates indefinitely and cannot be read.
• the average value calculation means is activated and the average value is displayed.
• the average is a simple average as described above, a large error may be caused depending on the degree of disturbance.
• the present invention provides a method for retrieving all the data sampled during a fixed averaging time of an indication value that fluctuates due to a disturbance such as a vibration of a conventional electronic balance.
• the disadvantage was that the average value contained an error with respect to the true value due to data variance due to the integration and the simple averaging.
• the present invention aims at facilitating reading of increased measurement accuracy.
• the electronic balance of the present invention samples and stores the indicated values at fixed time intervals, and at the same time, samples the indicated values with the latest sampled values first.
• the stored memory values are sequentially compared with the preset number of new ones, and if the difference value exceeds the preset allowable value, sampling is performed first. Delete the stored value, repeat the sampling and comparison, and display (g) the unit symbol in the meantime.
• the comparison means detects the entry, and at this time, the sampled storage values are first integrated, the average value is calculated, and the average value is used as the indicated value. In this case, the information is displayed.
• the present invention differs from the conventional simple average value calculation in electronic balances in that the vibration of the balance enters the stability limit and the data balance is reduced. Since the average value calculation is started immediately when the value falls within a certain allowable range, the average value is obtained, so that an average value that is statistically close to the true value can be obtained. However, it significantly improves the measurement accuracy of electronic balances.
• FIG. 1 is a configuration block diagram of an electronic balance according to one embodiment of the present invention.
• Fig-2 is a response graph when the electronic balance of the present invention is used for measuring the weight of experimental animals.
• Fi-g-1 1 is an electromagnetic force balance type balance, and W is a lateral signal of DC current measured at the balance, and this signal W is weighed.
• the amplifier 2 converts the analog signal A into a DC voltage analog signal
• the AZD converter 3 converts the analog signal A into a digital signal D.
• the measured values are sampled at regular time intervals. And transmits it to the data input control unit 6.
• Numeral 7 is a detection level setting device, which gives permission for automatic printing only at the time of weighing. With this detection level setting device 7, the detection level of an arbitrary amount of swelling, for example, 20 to 30% of the measurement range, can be set according to the measurement range.
• the digital signal D reaches the detection level, the sample (measured object) is placed on the balance (not shown).
• the control unit 6 immediately sends the print permission signal to 0
• the sampling time interval is set to, for example, 100 ms
• the data Di to Dn every 100 ms is used as the sample.
• the memory in the memory order group is stored in the memory register group Mi to ⁇ .
• 16 memory register groups Mi to ⁇ are provided to have a storage capacity of the maximum number of sampling times described later. The number of operations differs according to the set number of times, and the recorded value is updated for each sampling.
• Reference numeral 9 denotes a comparator. If the stored value Di Dn of the storage means 8 is newer data, for example, Dn, the data Dn is used as a reference (Dn- i) and (Dn- 2 ) have the function to compare each in order, and the comparison condition is first the number of samplings.
• the number N is determined by taking the average, for example, 4, 8, 1
• the maximum allowable value between the latest data and the data sampled and stored earlier that is, the data
• the width of the rack is arbitrarily set in the range of 2 to 40 digits (minimum display unit. For example, when measuring the weight of experimental animals, 12 to 40, vibration If it is smaller, set it to 2 to 9. We will explain this setting and the function of comparator 9 with reference to the response graph in Fig. 2.
• the vertical axis W represents the amount of sensing the balance (: g).
• P is the set tolerance. Assuming that this is 30 digits (for example, it corresponds to 30 mg in the case of a measurement range of 0 to 99.99 g), this 30 digit ( : 30 mg) is constant regardless of the indicated value W.
• Wc is the aforementioned detection level, and is set, for example, to 20 to 30 g.
• the horizontal axis T is the elapsed measurement time (seconds), and 1 to 13 are the number of samplings N every 100 msec.
• the sampling values are data D2, D3, and D4.
• the comparator 9 starts comparison as soon as the reference I is input. , de - data D 4 and Da, data 1> 4 and D 2, data D4 and di, the three comparisons of, and the difference kami 3 0 de I Fine-preparative more et failing its If it is less than or equal to 30 digits, it is judged as pass (see Fig. 2 :).
• the unit symbol (g :) and the decimal point are flashed.
• you display the value (usually zero) before the sample (experimental animal) is loaded the force can be changed to a blank. That is not to say. Further, the printer 14 is not operating and is on standby.
• TC-TD prepares the experimental animal to descend from the balance.
• TD to TE are the time required for the balance to return to the empty position, and 1 ⁇ 2 is the weight value for animal feces and urine remaining on the balance. It ends at the TF.
• the preparation for placing the second sample (experimental animal) on the balance is now complete.
• the measurement accuracy of the electronic balance when measuring the weighing amount under the influence of the vibration or disturbance of the object to be measured is significantly improved. It is extremely effective in measuring the weight of laboratory animals in the fields of medicine and pharmacy and quality control in the production line of a factory installed on a factory floor. It is used for

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Computer Hardware Design (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
• Indicating Measured Values (AREA)
• Investigating Or Analysing Biological Materials (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=13837819

Family Applications (1)

Country Status (6)

Families Citing this family (61)

Citations (3)

Family Cites Families (7)

• 1978
  • 1978-07-10 JP JP53084696A patent/JPS5823576B2/ja not_active Expired
• 1979
  • 1979-07-05 GB GB8007254A patent/GB2049945B/en not_active Expired
  • 1979-07-05 US US06/192,529 patent/US4347903A/en not_active Expired - Lifetime
  • 1979-07-05 WO PCT/JP1979/000178 patent/WO1980000272A1/ja unknown
  • 1979-07-05 CH CH195380A patent/CH655576B/de unknown
• 1980
  • 1980-02-25 EP EP19790900741 patent/EP0016841A4/en not_active Withdrawn

Patent Citations (3)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events