JPH02693Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a measurement value comparison display device that determines whether individual measurement data output from electrical measuring instruments etc. is within a predetermined level and displays the results. It is something.

In known measured value comparison and display devices, desired upper and lower limit values can be set by operating a dial or the like depending on the object to be measured. However, when trying to define the upper and lower limits within a range of ±x% of a certain reference value, it is important to set the values after calculating them, apart from using numerical values that can be easily calculated by mental calculation. I had to do it and it was a hassle.

Therefore, the purpose of this invention is to specify the percentage relative to a certain standard value.
It is an object of the present invention to provide a measured value comparison display device that can automatically set the upper limit value and lower limit value.

Hereinafter, embodiments of this invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the appearance of the measured value comparison and display device invented by this invention, which is a type of what is generally called a digital comparator.
It is equipped with a first dial knob 1 and a second dial knob 2, two digital displays 3 and 4 provided in relation to these, and a set value changeover switch 5, and by operating this switch 5, The upper limit value and lower limit value can be set in different ways. That is, in the illustrated state where the switch 5 is switched to the left side, the upper limit value and lower limit value can be set by operating the first and second dial knobs 1 and 2, as is well known, and these values are displayed on each digital display. It will be displayed on instruments 3 and 4. On the other hand, when the switch 5 is turned to the right, the first dial knob 1 is used to set a certain reference value, and the second dial knob 2 is used to specify a percentage of that reference value. Therefore, the upper limit and lower limit for the reference value are automatically set. Then, the measurement data supplied from the measuring device (not shown) is compared with the upper limit value and the lower limit value, and based on the judgment result, the light emitting display 6 provided on the panel surface is displayed.
Any one of the light emitting parts corresponding to "HI", "IN", and "LO" lights up, and it can be known whether the measured data is within a predetermined tolerance range. In this case, the determination result may be notified by the sound display 7 using a buzzer or the like. In addition,
Reference numerals 8, 8 are polarity changeover switches that are switched according to the polarity of measurement data.

Next, referring to FIG. 2 to explain this embodiment in more detail, the circuit configuration of this device includes an arithmetic circuit 9, a pair of comparison circuits 10 and 11, and each output from the comparison circuits 10 and 11. It consists of a determination circuit 14 that selectively causes one of the three light emitting diodes 15, 16, and 17 housed in the light emitting display 6 to emit light according to the condition, and these circuits are actually implemented by a microcomputer. Built-in. The values set by the first and second dial knobs 1 and 2 are input to either the arithmetic circuit 9 or the comparison circuits 10 and 11 via the switch 5. In other words, switch 5
When the switch is switched to the fixed contact a side (left side in FIG. 1), the value set with the first dial knob 1 is inputted to one comparison circuit 10 as the upper limit value,
The value set with the second dial knob 2 is input to the other comparison circuit 11 as the lower limit value. On the other hand, when the switch 5 is switched to the fixed contact b side (the right side in FIG. 1), the values set by the first and second dial knobs are both input to the arithmetic circuit 9. In this case, a predetermined reference value is set by the first dial knob 1, and the second
The percentage value with respect to the reference value is set using the dial knob 2. Therefore, the arithmetic circuit 9 calculates the upper limit value and the lower limit value from these values, and sets the upper limit value to one of the comparator circuits 10.
and outputs the lower limit value to the other comparison circuit 10. In this way, upper and lower limit values are set in comparator circuits 10 and 11, respectively.
These comparison circuits 10 and 11 have
Measurement data from a measuring device (not shown) is inputted via an input terminal 12 and a known A/D converter 13, respectively. In this case, when the measured data > the upper limit value, the outputs of the comparison circuits 10 and 11 are both "H",
When "H", upper limit > measured data > lower limit, the output of one comparison circuit 10 is "L", the output of the other comparison circuit 1
The output of 1 is "H", and when the measured data<lower limit value, the outputs of each comparison circuit are both "L" and "L". The determination circuit 14 operates to cause one of the light emitting diodes 15, 16, and 17 to emit light according to each of these outputs. That is, comparison circuits 10 and 1
When each output of 1 is "H", "H", the light emitting diode 15 corresponding to "HI" of the light emitting display device 6 emits light, and when each output is "L", "H", it is "IN".
The light emitting diode 16 corresponding to emits light, and
When each output is "L", the light emitting diode 17 corresponding to "LO" emits light. In this way, a comparative judgment display regarding individual measurement data is made. Further, the sounding device 7 can also be operated by the determination circuit 14.

Note that this measured value comparison display device is not limited to the digital type described above.

As is clear from the above description of the embodiment, according to this invention, by simply setting a predetermined reference value and a percentage thereof on the dial, calculations are automatically performed to determine the upper and lower limits. is set on the circuit, so it is practical because it is extremely easy to set the tolerance range of the product specified as a percentage, especially when checking the quality of a large number of electrical parts for quality control etc. .

[Brief explanation of the drawing]

FIG. 1 is an external view of a digital comparator according to this invention, and FIG. 2 is a block diagram thereof. In the figure, 1 and 2 are dial knobs, 3 and 4 are digital displays, 5 is a set value changeover switch, 6 is a light emitting display, 9 is an arithmetic circuit, 10 and 11 are comparison circuits,
14 is a determination circuit, and 15 to 17 are light emitting diodes.

Claims (1)

[Claims for Utility Model Registration] First and second input means provided for setting an upper limit and a lower limit of an allowable range with respect to a reference value of measurement data; In the measured value comparison display device including a comparison circuit that compares each of the values and a determination circuit that determines the output of the comparison circuit, the first input means inputs the reference value, and the second input means inputs the reference value. A measured value comparison display device, wherein a percentage value of an allowable range with respect to the reference value is inputted, and an arithmetic circuit is provided for calculating the upper limit value and the lower limit value from these values. .