JPS6069522A - Display device of electronic balance - Google Patents

Abstract

PURPOSE:To display the graph of variability with time (analog variation curve) of weight variation whenever it is requested by a measuring person by allowing one display device to display a digital measured value and the graph showing variation in measured value with time selectively. CONSTITUTION:A display part 2 is constituted by arraying plural display elements in a matrix. A digital display value determining means 3 determines a digital value to be displayed as the measured value on the basis of the output signal of a load detection part 1. Based on information from a time measuring means 5 which measures elapsed time after the initiation of the test, a graph plotting position determining means 4 determines a plotting position where the time transition of the measured value is displayed graphically. The display part 2 displays the measured value digitally through the digital display value determining means 3 or the transition of the masured value graphically by a graph plotting position determining means 4, by the instruction of a measure, etc. directed by an operating key 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a display device for an electronic balance, and more particularly to a display device for an electronic balance suitable for measurements in which the load on a weighing pan changes over time.

(b) Prior art In general, when measuring the amount of corrosion of a metal plate, etc. in a liquid phase, the amount of combustion of oil, etc. in a gas phase, or the amount of change in body weight during artificial dialysis in a large machine, it is common to It is necessary to place it on a frame and measure its weight change over time. With conventional electronic balances, you can read and record the digitally displayed weight values, or you can connect a recorder to the output port of the electronic balance via a D-A converter and output the weight values in digital quantities. The method used is to convert the weight to analog and record the weight change curve.

The former method requires the measurer to decipher the digital display value at predetermined intervals, which is cumbersome, and the latter method requires the preparation of other equipment such as a D-A converter and a recording needle. It is uneconomical.

In general, electronic balances are used for three purposes: measuring unknown weights, weighing predetermined weights, and tracking changes in sample weight during various reaction tests. Regarding means of displaying images, it lags behind the other two methods, and despite this, the current situation is that there is considerable demand for measurement.

(c) Purpose The present invention has been made in view of the above, and provides a display device for an electronic balance that can display a graph of weight change over time (analog change curve) at any time upon request from a measurer. It is an object.

(d) Configuration The configuration of the present invention will be explained based on the functional block diagram shown in FIG.

The load detection section 1 outputs an electric signal corresponding to the load placed on the weighing pan. The display section 2 is configured by arranging a plurality of display elements in a matrix, and lights up the display elements based on a command from the digital display value determining means 3 or the graph plot position determining means 4. The digital display value determining means 3 determines all digital quantities to be displayed as measured values based on the output signal from the load detection section 1. The graph plot position determining means 4 receives the output signal from the load detection section 1,
Based on the information from the timer 5 that measures the passage of time after the start of the test, a plot position where the time course of the measured values should be graphically displayed is determined. The display section 2 displays a digital display of the measured value by the digital display value determining means 3 or a graph of the transition of the measured value by the graph plotting position determining means 4 in response to an instruction from a measurer or the like using the operation keys 6.

(e) Examples Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

The load detection section 11 outputs an electric signal corresponding to the load on the weighing pan 11a, and the digital conversion data is taken into the control section 12 at predetermined minute intervals, for example, every 0.2 seconds. The control unit 12 is composed of a microcomputer, and includes a CPU 12a that executes programs and various calculations to be described later, and controls each peripheral device, and a ROM in which the programs are written.
12b.

and a RAM 12c having an area for storing digitally converted data from the load detecting section 11, areas as various registers, etc., and these are connected to each other by a pass line.

The control unit 12 includes an operation key 13 for giving commands, and a plurality of display elements arranged in a matrix, for example, 14 vertically by 65 horizontally, so that the appropriate display elements can be selected based on commands from the control unit 12. An output port 15 is connected to the display device 14 that can light up the
is provided.

Next, the effect will be explained. FIG. 3 is a flowchart showing a data processing program written in the ROM 12b.

The digital conversion data of the load detection value on the weighing pan 11a from the load detection unit 11 is stored in the RAM 12c of the control unit 12 every 0.2 seconds as described above, and the RAM 12C stores a maximum of n+1 pieces of data. Each time the latest data dQ is fetched, the oldest data dN
is discarded (STI, 5T2), and data dQ
Data dO-・-d in RAM 12c every time data is collected.
n is averaged, and from the average value WO, RAM1
The contents T of the tare memory set in 2C are subtracted to perform tare erasing processing, and the weighing value Wo' is determined (ST3). The weighing value Wo' is transferred to the display register and digitally displayed on the display 14 (ST
8,5T9).

When the operation key 13 is pressed, it is determined whether the key operation is a tare erase command or a test start command depending on the time the key is pressed. That is, when the operation key 13 is pressed (
ST7), keep the key flag ON until released 5TI
O, 5T12.5TIST20, 5T21, 5T6)
During this period, each time data dQ is sampled, the counter P is counted and amplified by one count (ST13), and the above-mentioned determination is made based on whether the value of P has reached a preset value of 1 (STII). Specifically, if K1 is set to 13, for example, if the operation key 13 is pressed and released before 2.6 seconds have elapsed, the weighing value WO' at that time will be added to the content T of the tare memory. A new tare value T is determined (ST15), and at the same time, a tare erasure process is executed in which the weighing value WoJ is set to O and displayed on the display 14 (ST1.5.5T16.5T1B,
5T19).

When the operation key 13 is pressed for more than 2.6 seconds and then released, a start command signal is issued to the reaction test heat source 20 from chemical capos 1 to 15 to start the test, and at the same time, the start flag is turned ON and ST4 is started. t and S in timing process
A test start process is executed in which the value of is set to O (ST22
). In ST4, S is amplified by one count each time data dQ is collected, and each time S reaches 300, (
(every 60 seconds) reset S to O and set the value of t to 1.
By counting and amplifying, the time after the test start command is generated is measured. Note that when the operation key 13 is released, the counter P is reset to 0 (ST17).

Now, place the sample to be tested on the weighing pan 11a, operate the operation key 13 to perform tare erasing processing, and then
When the test start command is given again by operating the
' is digitally displayed moment by moment on the display 14 as shown in FIG. 4(a) (ST5.5T23., STI 8
．． STI 9) When the operation key 13 is pressed in this state, while it is pressed, the time-based change in the weighing value Wo' is displayed with the amount of change on the vertical axis and the time on the horizontal axis, as shown in Figure 4 (Figure 4). Goo 77 is displayed on the container 14 (ST5, 5T23
5T25, 5T27, 5T19), and how to display the graph is determined as follows. First, calculate the dot coefficient. The dot coefficient is determined by dividing the weight scale on the display 14 by the number of dots in the vertical direction. That is, for example, the weight scale (full range) of the display 14 is set to 2 (
10g, number of dots in the vertical direction of the display 14 (number of display elements)
If 14, D=200g/14=14.3g is calculated. Next, the vertical plot position is determined by dividing the current metric value WC+' by the dot coefficient. For example, if WO' is 334.55g, 334.55g/14.3g=23.4 is obtained, and that value is rounded to obtain a vertical plot position of 23. Then, the value of t of ST4 at that point, that is, the elapsed time (minutes) after the start of the test, is set as the horizontal plotting position, and based on these, the coordinates to be plotted (lit) in the display 14 are determined, and the dots are displayed. Transferred to register and displayed. The dot display register stores the coordinate data each time it is sent, and displays the time-based changes in the measured value WO' as a continuous graph. In addition,
The number of display elements whose vertical plot position is vertical (14
), the weight scale on the display 14 changes from 0 to
Shifted from 200g to 200-400g. The same applies to the horizontal time scale.

While the operation key 13 is pressed, the counter P is set to d,
One count is added for each collection (ST26)
, the value is set to 2, for example 1
If you release the operation key 13 before reaching 00, the display 1
4 returns to the digital display of the weighing value WQ', and at the same time P is reset to O (ST23, 5T17, 5T18,
5T19).

If the operation key 13 is continued to be pressed until the counter P exceeds 100, the start flag is turned OFF and the machine returns to the recent state (ST24, 5T28).

Note that switching between the digital display and the graph display on the display 14 may be selected using a separate changeover switch without using the tare erase key. In this case, the main part of the flowchart is shown in FIG. Just configure it.

(f) Effects As explained above, according to the present invention, one of the effects of the electronic balance is
Since the two displays can selectively display the digital display of the weighing value and the graph display showing the change in the weighing value over time, it is possible to track and record the digitally displayed value as in the past. There is no need to connect and record an A converter or a recording needle, and the test can be performed economically and efficiently.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a functional block diagram showing the configuration of the embodiment of the present invention.
Flowchart showing the data processing program written in the OM12b, FIG. 4 (al and graph display!
@ (Front view in bl, FIG. 5 is a main part of a flowchart of a data processing program of another embodiment of the present invention. 11-Load detection unit 11 a----One weighing pan 12--
Control unit 12 a-CP Ul 2 b-ROM 12
c-RA M2S・-Operation key 14-Display 15--Output port 2o-Heat source patent applicant Shimadzu Corporation representative Patent attorney Nishi 1) Shin

Claims (3)

[Claims] (1) In an electronic balance equipped with a load detection unit that outputs an electrical signal corresponding to the load on the weighing pan and operation keys for inputting external commands, multiple display elements are arranged in a matrix. a display section formed by the above, a digital display value determining means for determining a weighing value to be digitally displayed on the display section based on the output signal from the load detection section, and a clock means for measuring the elapsed time after the start of measurement. and graph plot position determining means for determining a display element to be lit to graphically display the time measurement transition of the weighing value on the display unit based on the time measurement data and the output signal from the load detection unit,
A display device for an electronic balance, characterized in that the display unit is configured to selectively display the weighing value digitally or graphically by operating the operation key. (2) The above operation key is also used as the tare erase key of the electronic balance, and when the operation is performed for less than a predetermined time, the tare erase key is used as the tare erase key.
Claim 1, characterized in that when the operation key is operated for a predetermined time or more, it acts as a key for instructing the start of the measurement, and when the operation key is operated after the instruction to start the measurement, the graph display is executed. A display device for an electronic balance as described in Section 1. (3) The electronic balance according to claim 2, characterized in that by instructing the start of the measurement using the operation key, a start command is output from the output boat of the electronic balance to an external device. Balance display device.