JP2022090468A - Measurement instrument - Google Patents

Abstract

To register an error required for calibration by reducing a work load on a user.SOLUTION: A measurement instrument 1 includes: a terminal unit 2 that has a plurality of channels to which a reference device 8 that generates a reference signal corresponding to a physical quantity of a predetermined output level is selectively connected; a measurement unit 3 that measures the reference signal generated by the reference device 8 connected to a channel of the terminal unit 2 at a predetermined sampling cycle; an operation display unit 4 that has a registration key 4b that is operated when registering an error of the measured value with respect to a set value of the reference signal measured by the measurement unit 3, designates the channel to which the reference device 8 is connected, and displays the measured value of the reference signal of the designated channel; and an error registration unit 6b that determines a value obtained by rounding off the ones digit of the measured value of the reference signal displayed on the operation display unit 4 as the set value when the registration key 4b of the operation display unit 4 is pressed and that registers the difference between the set value and the measured value as an error.SELECTED DRAWING: Figure 1

Description

The present invention relates to a measuring instrument such as a recorder that requires periodic calibration at predetermined period intervals.

The recorder has been conventionally known as a measuring instrument that records a waveform based on data indicating changes in physical quantities such as temperature, current, and voltage of the object to be measured.

Conventionally, in a recorder that can confirm the measured value by a scale that displays the measured value, the calibration range of the scale is set as disclosed in Patent Document 1 below, and the measured value obtained at each of the two points at both ends of the calibration range is set. The correction value of the calibration range was obtained by combining the relational expression between the measured value and the displayed value of the measured value, and the correction expression was obtained by linearizing the operation between the two calibration points.

Further, as a conventional calibration method of a recorder, a method using a reference device is known. In this method, calibration is performed according to the procedures (1) to (6).
(1) Connect the calibration voltage generator to the channel of the terminal of the recorder as a reference device.
(2) An electromotive force corresponding to a physical quantity (for example, temperature: 0 ° C., 100 ° C., ...) At a predetermined output level is output from the reference device as a reference signal.
(3) Check and record the error between the measured value indicated by the recorder and the reference signal.
(4) Set the correction value for each output level of the reference signal output by the reference device.
(5) Repeat the operations (1) to (4) for the number of channels used.
(6) Recalibrate (work in (2) and (3)) and confirm that the error is within the standard.

By the way, in recent years, for example, a recorder used for heat treatment requires periodic calibration every predetermined period (for example, every 3 months), and in addition, it is connected to each channel of the terminal portion of the recorder. The accuracy required for sensors is becoming stricter, and more accurate calibration is required.

Japanese Unexamined Patent Publication No. 1-272920

However, in the conventional calibration method disclosed in Patent Document 1 described above, calibration is performed using a correction formula obtained by linearizing between two calibration points at both ends of the calibration range, so that an error is allowed. It was difficult to keep it inside and meet the demand for high-precision calibration.

Further, in the method using the reference device described above, the reference signal is output from the reference device, the error between the measured value of the recorder and the reference signal is confirmed and recorded, and each output level of the reference signal output by the reference device is recorded. Since it is necessary to repeat the work of setting the correction value for the number of channels used, the calibration work takes time and effort, which is a burden on the user.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a measuring instrument capable of reducing the work load on the user and registering an error required for calibration.

In order to achieve the above object, the measuring instrument according to claim 1 of the present invention includes a terminal portion having a channel to which a reference device for generating a reference signal corresponding to a physical quantity of a predetermined output level is connected. In the vessel
A measuring unit that measures a reference signal generated by a reference device connected to the channel of the terminal unit at a predetermined sampling cycle, and a measuring unit.
An operation display unit that has a registration key to be operated when registering an error in the measured value with respect to the set value of the reference signal measured by the measurement unit, and displays the measured value of the reference signal of the channel to which the reference device is connected. When,
When the registration key of the operation display unit is pressed, the value obtained by rounding off the ones digit of the measured value of the reference signal displayed on the operation display unit is determined as the set value, and the set value and the measured value are determined. It is characterized by having an error registration unit that registers the difference between the two and the error as an error.

The measuring instrument according to claim 2 of the present invention is a measuring instrument having a terminal portion having a channel to which a reference device generated by sequentially switching reference signals corresponding to physical quantities of different output levels is connected.
A measuring unit that measures a reference signal sequentially generated by a reference device connected to the channel of the terminal unit at a predetermined sampling cycle, and a measuring unit.
It is provided with an error registration unit that determines a value obtained by rounding off the ones digit of the measured value of the reference signal measured by the measurement unit as a set value and registers the difference between the set value and the measured value as an error. It is characterized by that.

The measuring instrument according to claim 3 of the present invention is the measuring instrument according to claim 1.
The terminal portion has a plurality of channels and has a plurality of channels.
When the reference device is selectively connected to the plurality of channels, the operation display unit selectively designates the channel for simultaneously registering the error.

According to the present invention, it is possible to reduce the work load on the user and shorten the time required for calibration.

It is a block diagram which shows the connection structure at the time of calibrating the measuring instrument which concerns on this invention. It is a figure which shows an example of the setting screen at the time of calibration of the measuring instrument which concerns on this invention.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the attached drawings.

As shown in FIG. 1, the measuring instrument 1 of the present embodiment is a recorder that records measurement data (hereinafter, also referred to as measured values) of an object to be measured over time, and is a terminal unit 2, a measuring unit 3, and a measuring instrument 1. It is roughly configured with an operation display unit 4, a storage unit 5, a control unit 6, and a communication unit 7.

The terminal portion 2 is provided on the back surface of the main body of the measuring instrument 1, has a plurality of channels CH1, CH2, ..., CHn (for example, 48 channels), and the reference instrument 8 is selectively connected when the measuring instrument 1 is calibrated. .. The terminal portion 2 may have only one channel.

The reference device 8 is a voltage generator for calibration of the measuring device 1, and generates a reference signal of a voltage value corresponding to a physical quantity (temperature, mass, humidity, gas concentration, pressure, etc.) of a set predetermined output level. .. For example, when the temperature is a physical quantity, the reference device 8 generates a reference signal having a voltage value corresponding to this temperature value when the user sets a temperature value as an output level.

Although not shown, various sensors (for example, temperature sensor, weight sensor, etc.) are used in the plurality of channels CH1, CH2, ..., CHn of the terminal portion 2 when the physical quantity in the measurement atmosphere is detected by the measuring instrument 1. Humidity sensor, gas sensor, pressure sensor, etc.) are selectively detachably and interchangeably connected. Specifically, when detecting the temperature in the measurement atmosphere in a continuous furnace that heats parts, for example, a temperature sensor composed of a thermocouple, a resistance temperature detector, a thermistor, a semiconductor, etc. is installed in the furnace. The temperature sensor is appropriately arranged at a predetermined position, and the temperature sensor is selectively connected to a plurality of channels CH1, CH2, ..., CHn of the terminal portion 2.

The measuring unit 3 measures the reference signal generated by the reference device 8 selectively connected to the plurality of channels of the terminal unit 2 for each channel at a predetermined sampling cycle.

The operation display unit 4 has both the functions of the operation unit and the display unit, and is provided at a predetermined position (for example, the front surface of the main body) of the main body of the measuring instrument 1. In addition to the touch panel, a liquid crystal display and electroluminescence are provided. It is configured to include a display unit such as a sense (EL: Electroluminescence), a setting key or operation key manually operated by an operator, and an operation unit such as a touch key on the display screen of the display unit.

The operation display unit 4 displays the setting screen 4a of FIG. 2 when registering an error used for calibration of the measuring instrument 1 under the control of the control unit 6.

A display window 11 for displaying a channel to be registered for an error is displayed in the upper left portion of the setting screen 4a of FIG. 2, and an operation key 12 is arranged in parallel with the display window 11, and the operation key 12 is used. It is possible to input and specify the channel number to be displayed in the display window 11 by operating the keyboard on the setting input screen (not shown) displayed when the button is pressed. The setting screen 4a of FIG. 2 shows a state in which CH1 is displayed on the display window 11 as an error registration target.

Further, at the lower part of the display window 11 and the operation key 12, each set value of the channel of the display window 11 and a list of errors corresponding to each set value are displayed. On the setting screen 4a of FIG. 2, No. "0.0" in the display window 13 of the set value of 1, "0.3" in the error display window 14, No. "100.0" in the display window 13 of the set value of 2, "0.2" in the error display window 14, No. "200.0" is displayed in the display window 13 of the set value of 3, and "0.2" is displayed in the error display window 14, No. A state in which "300.0" is displayed in the display window 13 of the set value of 4 and "0.3" is displayed in the error display window 14 is shown.

Further, the operation keys 15 are arranged side by side in the display window 13 of each set value. When the operation key 15 is operated, a setting input screen in which a keyboard (not shown) is arranged is displayed, and the setting value to be displayed on the display window 13 can be manually input by operating the keyboard.

Further, the operation keys 16 are arranged side by side in the error display window 14 corresponding to each set value. When the operation key 16 is operated, a setting input screen in which a keyboard (not shown) is arranged is displayed, and the error value to be displayed on the display window 14 can be manually input by operating the keyboard.

A display window 17 for displaying the measurement data (measured value) of the reference signal is displayed in the center on the right side of the setting screen 4a of FIG. On the display window 17, the measured values of the reference signals of the channels of the display window 11 measured by the measuring unit 3 at a predetermined sampling cycle are sequentially switched and displayed.

Under the display window 17 for displaying the measured value, the channel for simultaneously registering the error (error of the measured value with respect to the set value of the reference signal) when the reference device 8 is connected to a plurality of channels is selectively displayed. Windows 18 and 19 and operation keys 20 and 21 are arranged side by side.

In the setting screen 4a of FIG. 2, the channel number is input by operating the keyboard on the setting input screen (not shown) displayed when the operation key 20 arranged side by side in the display window 18 on the right side of from is pressed. Similarly, the channel number is input by operating the keyboard on the setting input screen (not shown) displayed when the operation keys 21 arranged side by side in the display window 19 on the right side of to are operated. This makes it possible to selectively specify the range of channels for which errors are registered at the same time.

For example, by pressing the operation key 20 juxtaposed in the display window 18 on the right side of from, operating the keyboard on the setting input screen (not shown), inputting "1", and juxtaposing it in the display window 19 on the right side of to. When the operation key 21 is pressed and the keyboard on the setting input screen (not shown) is operated to input "5", the range of CH1 to CH5 is selected and specified as the channel for simultaneously registering the error.

A clear key 22 is arranged under the display window 19. When the clear key 22 is pressed, the channel numbers displayed on the display windows 18 and 19 are cleared to the initial values (for example, "1").

At the lower part of the display window 18 and the operation key 20 arranged side by side on the setting screen 4a of FIG. 2, a registration key 4b operated when registering an error of the measured value with respect to the set value of the reference signal is arranged.

In the present embodiment, when the registration key 4b is pressed, the value obtained by rounding off the ones digit of the measured value of the reference signal displayed on the display window 17 is determined as the set value.

At the lower right of the setting screen 4a of FIG. 2, a snapshot key 23 pressed when taking a snapshot image of the setting screen 4a is arranged. The snapshot image of the setting screen 4a captured by pressing the snapshot key 23 is stored in the storage unit 5.

At the lower left of the setting screen 4a of FIG. 2, a return key 24 for displaying a confirmation screen (not shown) is arranged. On the confirmation screen (not shown) when the return key 24 is pressed, whether or not to confirm the registration of the error of the measured value of the reference signal for each set value of the specified channel listed in the setting screen 4a is "Yes" or. This is done by selecting "No".

To confirm the registration of the error, select "Yes" or "No" on the confirmation screen (not shown) when the return key 24 is pressed, as well as the confirmation key (not shown) separately provided on the setting screen 4a. It can also be performed by pressing the registration key 4b which also serves as the confirmation key.

Further, on the setting screen 4a of FIG. 2, the list is displayed in the order of "No.", "setting value", and "error" from the left of the display screen, and the "measured value" is displayed in the display window 17 separate from the list display. However, the configuration is not limited to this. For example, the "measured value" may be incorporated into the list display of the setting screen 4a of FIG. 2, and the list may be displayed in the order of "No.", "set value", "measured value", and "error" from the left side of the display screen.

The operation display unit 4 is, for example, the type of sensor used when detecting the temperature in the measurement atmosphere in the continuous furnace (for example, in the case of a thermocouple, K thermocouple, E thermocouple, J thermocouple, T). Thermocouple) setting, measurement data recording start / stop, measurement data acquisition time interval recording interval setting, upper and lower limit alarm values for outputting alarms, measurement data channel number setting to be displayed on the display screen , Setting the scale range indicating the measurement range of each channel, setting the display color of each channel, etc., operate when making various settings necessary for driving the measuring instrument 1 and control the various set signals that have been operated. Output to unit 6.

Further, in the operation display unit 4, the display content is controlled by the control unit 6, and in addition to the display of the setting screen 4a in FIG. 2, the trend display of the measurement data of each channel from various sensors and the communication means (not shown) are used. Display various data captured by the user.

The storage unit 5 is composed of, for example, a ROM, a RAM, an external storage medium such as a memory card or an external storage device that can be attached to and detached from the main body of the measuring instrument 1, and various processing programs related to data processing of the recorder, the measuring unit 3. The measured value for each channel measured in is stored. Further, the storage unit 5 stores the list data of the error of the measured value for each set value finally determined as a file tabulated for each channel.

The control unit 6 is composed of a microprocessor such as a CPU that collectively controls each unit, and includes a display control unit 6a and an error registration unit 6b.

The display control unit 6a controls the waveform display based on the data indicating changes in physical quantities such as the temperature, current, and voltage of the object to be measured, and also determines the error of the measured value with respect to the set value of the reference signal for each channel of the terminal unit 2. At the time of registration, the display of the setting screen 4a of FIG. 2 by the operation display unit 4 is controlled.

The error registration unit 6b determines as a set value a value obtained by rounding off the ones digit of the measured value of the reference signal displayed on the display window 17 of the setting screen 4a when the registration key 4b of the operation display unit 4 is pressed. Then, the difference between this set value and the measured value of the reference signal is registered as an error.

The communication unit 7 transfers the information stored in the storage unit 5 (measured value for each channel, list data of the error of the measured value for each set value, etc.) to the external device 9 (computer, controller) via wireless communication or a wired network. , Hard disk, memory card, etc.). The recording items of the above list data include, in addition to the numerical data of the error for each set value for each channel, the adjustment date and time, the device information (serial number, etc.), the person in charge, the device name, the expiration date, and the like.

Next, a method of registering an error of the measured value with respect to the set value of the reference signal used for calibration of the measuring instrument 1 configured as described above will be described. Here, a case where the reference device 8 is connected to the channel CH1 of the terminal portion 2 and the error of the measured value with respect to the set value of the reference signal is registered will be described as an example.

The reference device 8 is connected to the channel CH1 of the terminal unit 2, the output (temperature value) of the reference device 8 is set, and a reference signal having a voltage value corresponding to the set output (temperature value) is generated from the reference device 8. For example, the output (temperature value) of the reference device 8 is set so as to generate a reference signal having a voltage value corresponding to 0 ° C.

Then, on the setting screen 4a of FIG. 2, the number of the channel for which the error is to be registered is specified. For example, on the setting screen 4a of FIG. 2, the operation key 12 is pressed so that "1" is displayed on the display window 11, and the keyboard on the setting input screen (not shown) is operated to display the error of the channel to be registered. Enter the number "1".

Then, when a reference signal is generated from the reference device 8 and the measurement by the measuring unit 3 is started, the measured values of the reference signal measured by the measuring unit 3 in a predetermined sampling cycle are sequentially displayed on the display window 17 of the setting screen 4a. Is displayed.

The user confirms the measured value of the reference signal displayed on the display window 17 of the setting screen 4a, and presses the registration key 4b when the measured value becomes stable. When the registration key 4b is pressed by the user, the error registration unit 6b determines as the set value the value obtained by rounding off the ones digit of the measured value of the reference signal displayed on the display window 17 of the setting screen 4a at that time. , The difference between this set value and the measured value of the reference signal of the display window 17 is registered as an error.

Hereinafter, the output (temperature value) of the reference device 8 is set by changing from 0 ° C. to 100 ° C., 200 ° C., 300 ° C., ..., And the above-mentioned operation is executed for each channel at each output of the set reference device 8. do. As a result, the error of the measured value with respect to each set value of the reference signal for each channel of the terminal portion 2 of the measuring instrument 1 is registered.

When registering the error of the measured value for each set value of the reference signal of a plurality of channels at the same time, for example, when registering the error of the measured value for each set value of the reference signal of CH1 to CH6, the setting screen of FIG. In 4a, press the operation key 20 juxtaposed to the display window 18 on the right side of from to input "1", and press the operation key 21 juxtaposed to the display window 19 on the right side of to to press "6". input. As a result, the range of CH1 to CH6 is selected and designated as the channel to be registered.

Then, the above-mentioned operation is repeated until the error of the measured value for each set value of the reference signal for all channels is within the reference value, and the error is registered, and the measurement for each set value of the reference signal for all channels is performed. It is confirmed that the error of the value is within the reference value, the registration of the error is confirmed on the confirmation screen (not shown), and the calibration of the measuring instrument 1 is completed.

Then, when the temperature sensor is selectively connected to a plurality of channels of the terminal portion 2 of the measuring instrument 1 after calibration and the measurement is performed, the measured value measured by the measuring unit 3 is registered in the corresponding channel. Correct the measured value based on the error made. For example, as shown in the setting screen 4a of FIG. 2, when the measured value of channel CH1 is rounded off to the first digit and 300.0 ° C is set as the set value and an error of 0.3 ° C is registered, the temperature is registered. If the measured value when the sensor is connected to the channel CH1 of the terminal is "300.9 ° C", subtract the error 0.3 ° C (correction value: -0.3 ° C) from the measured value 300.9 ° C. 300.6 ° C. is the corrected measured value.

As described above, according to the present embodiment, the user presses the registration key 4b after confirming the change in the measured value on the setting screen 4a, and the first place of the measured value when the user presses the registration key 4b. The rounded value is judged as a set value, and the difference between this set value and the measured value is registered as an error. As a result, the work load on the user can be reduced and the time required for calibration can be shortened.

By the way, in the above-mentioned error registration method, the error of the measured value with respect to each set value of the reference signal is registered using the registration key 4b, but the registration can also be performed without using the registration key 4b. In this case, the reference device 8 sequentially switches and generates reference signals corresponding to physical quantities (for example, different temperature values) of different output levels. The switching of the reference signal is performed, for example, by the control of the control unit 6 when the measured value stabilizes within the preset allowable range or every preset time. Then, the measuring unit 3 measures the reference signal sequentially generated by the reference device 8 connected to the channel of the terminal unit 2 at a predetermined sampling cycle. After that, the error registration unit 6b determines the value obtained by rounding off the ones digit of the measured value of the reference signal for each channel measured by the measurement unit 3 as the set value for each channel, and the channel corresponding to the set value for each channel. The difference from each measured value is registered as an error. As a result, the error between the set value and the measured value for each channel can be automatically registered to the user simply by connecting the reference device 8 to the channel of the terminal portion 2 of the measuring device 1 and generating a reference signal. The work load can be further reduced.

Further, in the above-described embodiment, the recorder 1 has been described as an example, but the present invention is not limited to this. The measuring instrument 1 to which the present invention is adopted may be any measurement-related device that requires periodic calibration at predetermined period intervals. Specific measuring instruments 1 include, for example, a data logger (data recording device) that records measurement data of various sensors that detect physical quantities in the measurement atmosphere, as well as a regulator that controls an external device using the recorded measurement data. There is a control device (controller).

Further, in the above-described embodiment, the reference device 8 generates a reference signal (voltage value corresponding to the temperature value) corresponding to the temperature, but the reference device 8 corresponds to physical quantities such as mass, humidity, and pressure. It is possible to perform the same calibration even when the reference signal is generated.

Further, although the operation display unit 4 in FIG. 1 has been described as a configuration in which the functions of the operation unit and the display unit are integrated, the operation unit and the display unit may be individually configured by dividing the functions.

Although the best form of the measuring instrument according to the present invention has been described above, the present invention is not limited by the description and drawings in this form. That is, it goes without saying that all other forms, examples, operational techniques, and the like made by those skilled in the art based on this form are included in the scope of the present invention.

1 Measuring instrument 2 Terminal 3 Measuring unit 4 Operation display 4a Setting screen 4b Registration key 5 Storage unit 6 Control unit 6a Display control unit 6b Error registration unit 7 Communication unit 8 Reference device 9 External device 11, 13, 14, 17, 18, 19 Display window 12, 15, 16, 20, 21 Operation key 22 Clear key 23 Snapshot key 24 Back key

Claims (3)

In a measuring instrument having a terminal having a channel to which a reference device that generates a reference signal corresponding to a physical quantity of a predetermined output level is connected.
A measuring unit that measures a reference signal generated by a reference device connected to the channel of the terminal unit at a predetermined sampling cycle, and a measuring unit.
An operation display unit that has a registration key to be operated when registering an error in the measured value with respect to the set value of the reference signal measured by the measurement unit, and displays the measured value of the reference signal of the channel to which the reference device is connected. When,
When the registration key of the operation display unit is pressed, the value obtained by rounding off the ones digit of the measured value of the reference signal displayed on the operation display unit is determined as the set value, and the set value and the measured value are determined. A measuring instrument characterized by having an error registration unit that registers the difference between the two and the error as an error. In a measuring instrument having a terminal having a channel to which a reference device generated by sequentially switching reference signals corresponding to physical quantities of different output levels is connected.
A measuring unit that measures a reference signal sequentially generated by a reference device connected to the channel of the terminal unit at a predetermined sampling cycle, and a measuring unit.
It is provided with an error registration unit that determines a value obtained by rounding off the ones digit of the measured value of the reference signal measured by the measuring unit as a set value and registers the difference between the set value and the measured value as an error. A measuring instrument characterized by that. The terminal portion has a plurality of channels and has a plurality of channels.
The measuring instrument according to claim 1, wherein when the reference device is selectively connected to the plurality of channels, the channel for simultaneously registering the error is selectively designated by the operation display unit. ..

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