JPS58215516A - Electric balance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a ξ rus number that depends on the measured value. The present invention relates to an electric balance having a measurement value detection device which sends out a pulse train directly or via an A/D converter, a counter to which these pulses are supplied, and a microprocessor for digital signal processing.

Balances of this type are generally known. Usually at that time, the total i F
The output terminals of the individual seven lip-flops are connected to the microprocessor via which the microprocessor reads out the counting state of the measuring instrument at the end of the measuring time. Furthermore, a reset conductor is provided between the microprocessor and the counter, via which the counter is set to a value of zero according to the reading of its counting state by the microprocessor. However, this large number of connecting lines can be a major nuisance for highly integrated components.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a circuit for the above-mentioned electric balance that requires fewer connection lines between the microprocessor and the counter.

According to the invention, this object is achieved as follows.

That is, among the output terminals of the counter, only the O/N flow output terminal is connected to the microprocessor, and the microprocessor is provided with a clock output terminal, so that the clock output terminal is the clock output terminal of the microprocessor is activated by a microprocessor program such that in this operating state the clock output terminal selects a clock ξ pulse; Together with the signal output terminal, it is connected to the input terminal of the counter via an OR gate.

The counting state of the counter is then read out as follows. That is, the microprocessor is read by sending out clock ξ pulses until the counter completes counting and a signal edge of the ζ flow signal appears. Then, from the clock pulse number and the counting capacity of the counter, the micro-Zoro sensor can determine the original counting state of the counter. In this readout method, only two connecting lines are required between the microprocessor and the counter.

Description of examples Next, embodiments of the present invention will be described in detail using the drawings.

As is well known, the illustrated measured value detection device for the electric scale includes a movable cargo receiving platform 3. This cargo tray supports a tray 7 and has two guide rods 5 and 6 guided in parallel.
via which it is connected to the stationary part 1 of the balance. Leaf springs 5a, 5b, 6a, and 6b are connected to the guide rod 5 as connecting members, respectively.
and is connected to the end of 6. The receiving platform 3 supports a fill 9 on a protruding arm, which coil 9 interacts with the magnetic field of a stationary permanent magnet system.

A position sensor 11 detects the position of the receiving platform 3 and, via a regulating amplifier 12, supplies the necessary current to the GC to compensate for the load. Such a compensation current is supplied via a movable wire 10 of the coil 9 and at the same time a measuring resistor 13.
flows through. A measuring voltage proportional to the current is taken out at the measuring resistor 13, and this measuring voltage is applied to the A/D converter 1.
Digitized at 4.

Such digitization can then be carried out using the generally known dual slope method or the multiple slope method described in German Patent No. 2,114,141.
It is done according to the method. These two methods provide a ξ pulse train as a digitized measurement result, and the ξ
The number of pulses is proportional to the measured value.

That is, the pulse trains of successive measurement results are then separated from each other by pause times.

The ξ pulse from the A/D converter 14 reaches the input side of the counter 16 via the OR gate 15 and is counted there. The end of the ξ sequence, that is, the beginning of the body IF period, is A
/ The microprocessor 17 is notified from the D converter 14 via the connection line 24. During this pause period, the microprocessor 17 reads the counting state of the counter 16 by sending out clock pulses from its clock output terminal 20. This clock pulse is the second clock pulse of OR gate 15.
is fed to the input side of the counter via the input end of the counter. This process continues until a signal edge of the O.ζ flow signal appears at the O.S flow output 21 of the counter 16. The microprocessor sensor 17 receives a clock signal from its clock output terminal 20. Sending out the pulses is stopped, and the resultant total V& unit 16 becomes a value of zero, and enters a quasi-one state in which it counts the next .xi. pulse sequence. The microprocessor 17 can determine the original counting state of the counter 16 from the clock signal sent by the microprocessor 17 until the O.S. flow signal appears and the counting capacity of the counter 16.

This digitally measured bundle is further processed (weighed, converted into a predetermined weight unit, etc.) in the micro-scale processor 17.
and is instructed by the digital instruction device 18.

[Brief explanation of drawings]

The figure is a schematic vertical cross-sectional view of the main mechanical parts of a scale according to the present invention, and a block diagram of the main parts of its electronic device. 3... The cargo receiver is a stand, Φ... Arm, 5, 6... Guide body, 5a, 5b, 6a, 6b --- Leaf spring, 7.
...The receiver is a tray, 11...Position sensor, 12...Adjustment amplifier, 13...Measuring resistor, 14...A/D converter, 15...OR gate, 16...Counter, 17
・・・Microprocessor

Claims (1)

[Claims] 1. A measurement value detection device that sends out a ξ pulse train having a /8 pulse number depending on the measured value directly or via an A/D converter, and a device for supplying these ξ pulses. In an electric balance having a counter and a microprocessor for digital signal processing, only the output terminal (21) out of a total of sixteen (16) output terminals is connected to the microprocessor (17). , the microprocessor (17) is provided with a clock output terminal (20), such that the clock output terminal (20) is activated by the microprocessor program during the pause time between ξ pulse trains; In this state, the clock output terminal (20) is configured to send out a clock ξ pulse, and the clock output terminal (20) of the microprocessor is connected to a signal output terminal of a measurement value detection device or an A/D converter (14). (23
) along with the counter (16) through or game) (15)
An electric scale characterized in that it is connected to an input terminal (22) of. 2. The O-ζ flow signal is the O-ζ of the counter (16).
2. An electric balance according to claim 1, wherein the operating state of the clock output terminal (20) of the microprocessor ends as soon as it appears at the Kutslow output terminal (21). 3. The microprocessor (17) is tli (16)
Counting capacity and operating status 4 clock output terminals (20
) The electricity according to claim 1 or 2, characterized in that the number of clock pulses sent out from the measured value detection device or the A/D converter (14) is determined by the number of .xi. Scales. Claims: The microprocessor (17) receives a signal from the measurement value detection device or the A/D converter (14) via the connection line (24) during the rest time between the ξ pulse trains. The electric balance according to any one of Items 1 to 3.