JPS5819517A - Electronic balance - Google Patents

Abstract

PURPOSE:To obtain a device which automatically outputs only accurate data in the optimum measuring time and can perform highly accurate measuring, by providing a control part comprising a level setting device, a stabilizing width comparing and judging device, an operating device, a varying width comparing and judging device, and the like. CONSTITUTION:The level setting device 32 introduces the data from a load to electricity transducer 1 and judges whether an object is placed on an measuring pan or not. The stabilizing width comparing and judging device 33 judges whether the input state is stable or not based on the data from a comparing time setting device 35 and a stabilizing width setting device 34. The operating device 36 computes the difference between the latest data and the previous data which is obtained one time before in accordance with the program in a program device 38 and performs averaging operation. The varying width comparing and judging device 37 judges whether the difference between the data obtained by said operating device 36 is within the preset varying width or not and outputs an output starting signal which indicates the fact that the difference is within the varying width.

Description

[Detailed description of the invention] This invention relates to electronic balances.

With conventional electronic balances, when a certain number of pieces of data fall within the allowable width, they are averaged over a certain averaging time and displayed or printed. This had the disadvantage that the reproducibility of the weighing values deteriorated.Also, when the data was fluctuating and when the data was stable,
With conventional electronic balances, the averaging time changes depending on when the value is reached, and when fluctuations occur, the averaging time is short, but after stabilization, the averaging time is extended depending on the duration of the stable state, but When automatically transferring and outputting, it is difficult to judge when the measurement is completed. For example, if data output is started after a certain period of time has elapsed after entering a stable state, the measurement time becomes longer than necessary and the efficiency of the weighing operation decreases.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, an object of the present invention is to provide an electronic balance that automatically outputs only accurate data in an optimal measurement time and that allows highly accurate weighing.

In order to achieve the above object, the present invention provides a load-to-electrical conversion device that converts a load applied to a weighing pan into a digital electrical signal, and means for determining whether an object is placed on the weighing pan. , an arithmetic device that introduces the output of the load-to-electricity converter and executes an averaging operation; a means for determining whether the difference between the latest calculation result and the past calculation result is within a stable range; means for determining whether or not a calculation result is within a fluctuation range (for example, E:4Fr) determined from the number of times of averaging (to) and a predetermined probability error (E) when the range is within the range; and a calculation method of the calculation device. and an output means for outputting the results, by adding data sequentially output by the load-to-electrical conversion device when the difference between the latest calculation result of the calculation device and the value of the past calculation result is within the stability range. The present invention is characterized in that the averaging operation is executed while increasing the number of data items sequentially, and when the latest operation result is within the above fluctuation range, the averaging operation result is transferred to the above-mentioned output means.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment. The load-electricity converter 1 converts the data of the load W into a digital signal every minute, for example, every 0.2 seconds, and outputs the digital signal to the control unit 3. The register device 2 has an area for storing % ("1) pieces of data, and the newest collected data is d.
eK is stored and every time data is input, Kde→tun→・
...→dn-1→dn, and the oldest data dn is pushed out and discarded. Level setter 32
inputs data from the load-to-electricity converter 1 via the data transfer control unit 31, and when the data exceeds a preset detection level (for example, 30 counts), the data is transferred to the weighing pan. It determines when an object is placed or removed, and transfers the data to the stability width comparison/judgment unit 33. Here, it is assumed that a load detection flag (FLG) is raised when an object is placed on the weighing pan. The stability width comparison/determination device 33 compares the number of times preset by the comparison number setting device 35 to see if the data is within the stable width of the data preset by the stability width setting device 34 to determine whether the input state is stable. It is determined whether the data is unstable, data that is not in a stable state is output to the display and recording device 5, and data that is in a stable state is transferred to the arithmetic device 66. The arithmetic device 36 calculates the difference (do-do-) between the latest collected data d and the immediately previous data d0-1 according to the program stored in the program device 38, and outputs the difference to the fluctuation range comparison/judgment device 37. It performs an averaging operation. The fluctuation range comparison/judgment device 67 is mounted on the calculation mounting 36.
It is determined whether the difference between the data obtained by the above is within a preset fluctuation range, and when it is within the fluctuation range, an output start signal indicating this is output. This fluctuation range B is, for example, the individual measurement error ξ, the probability word difference ξ,
Relationship with the number of averaging times (number of measurements) N, that is, ξ=Ex
It can be determined from N.

For example, if you want to weigh with a variation of ±0.111117 on a balance whose full scale is 200.9,
If the number of averaging times N is 11, the fluctuation range B is 0.1
approximately 0.3). In order to clearly indicate the process up to the averaging display of data, the notification device 4 may blink some of the display symbols such as a decimal point, a sign symbol, a unit symbol, etc. without adding any special blinking device, or The display is configured to leave the displayed number blank to notify the operator that the data is not in a stable state or is not within the fluctuation range B.

FIG. 2 shows a flowchart of the program of this embodiment.

When the program starts, data d, ... dn are collected from the load-electrical conversion device 1 into the register device 2,
In process 1, d・−bd, d, −+d, , −dn
After the data shift of l-+dn is executed, the latest data d is collected in the empty register (steps 100 to 102). When the level setter 32 detects that a load is applied to the weighing pan, the flag (FLG) is turned ON (steps 103 and 104).

The stability width set in advance is taken in from the stability width setting device 34 to the stability width comparison/judgment device 33 (step 105), and the difference between the data (d, -d・-1) is compared with the stability width ( Step 106).

When the data is not within the stable range, or when the data has not reached equilibrium at the number of times preset by the comparison number setter 35, the changing data is displayed and a notification to that effect is provided (steps 123 to 126).

When the data is within the stable range, it is determined whether the small value has reached the data storage number mk of the register device 2, and if it has not reached it yet, then (i + 1) is added and the next processing is performed. 2i/c and add the latest data d to the past data total Σdi
, (steps 107 to 112) If the load is not on the paper plate and the load detection FLG is OFF in step 104, data averaging is performed using the new iK'' in process 4 and this average is The data is displayed by folding the value with
is calculated, and the data difference (do-(L-*)) is compared with the fluctuation range B (steps 113. to 115). If the difference in value is within the fluctuation range B, an output start signal is issued ( Step 116). Fluctuation range E x% up to the number of averaging times N
``If a difference between data having a smaller value is obtained, the average value X based on the number of data pieces N is obtained in process 4 and the data is displayed (steps 115 to 119).

Further, in process 8, the data X0 is transferred to the output boat, a command to print is given to the printer, and the data X. is held or stored in memory (steps 121, 120). When the load detection FLG is OFF in the judgment step 113, a signal is issued to the notification device 4 in the process 7 to notify that fact (step 1)
24, 125).

As described above, according to the present invention, the output start signal is output when the data is within the variation range due to the stochastic error, and accurate average value data is transferred. A highly accurate electronic balance with excellent data reproducibility can be obtained. In addition, when only data within the fluctuation range is output, the number of averaging times is automatically selected accordingly, so the averaging calculation is performed in the optimal averaging time without waste, reducing measurement time. be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart of the program of the embodiment shown in FIG. 1...Load-electrical conversion device 2...Register electric manufacturing 3...Control unit 4...Notification device 5...Display and recording Device 33...Stability range comparison/judgment device 36...Calculation device 37...Variation range comparison/judgment device 38...Programming device Patent applicant Shimadzu Corporation Agent Patent Attorney Nishi 1) New Figure 1

Claims (1)

[Scope of Claims] A load-to-electrical conversion device that converts a load applied to a weighing pan into a digital electrical signal, and a wooden means for determining whether or not an object is placed on the weighing pan. an arithmetic device that introduces the output of the load-to-electricity converter and executes an averaging operation; a means for determining whether the difference between the latest arithmetic result and the past arithmetic result is within a stable range; comprising means for determining whether or not a calculation result is within a fluctuation range determined from the number of averaging times within a stable range and a predetermined probability error; and an output means for outputting the calculation result of the calculation device, When the difference between the latest calculation result of the calculation device and the value of the past calculation result is within the stability range, the averaging calculation is performed while increasing the number of data sequentially by adding data sequentially output from the load-electrical conversion device. an electronic balance configured to execute the averaging calculation and transmit the averaged calculation result to the output means when the latest calculation result is within the fluctuation range.