JPH11326387A - Measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring apparatus in which erroneous measurement and measurement at a lower accuracy can be avoided while facilitating the observation of a measured value necessary for a measuring person. SOLUTION: This apparatus 1 is provided with a display control part to display the results of measurement on a display part 2 corresponding to a measuring object signal inputted. In this case, the display control part displays the results of measurement corresponding to the measuring object signal out of a predetermined input range and the results of measurement corresponding to the measuring object signal within the specified input range in an identifiable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device configured to display a measurement result corresponding to an input signal to be measured on a display unit.

[0002]

2. Description of the Related Art As a measuring device of this kind, the applicant has already developed a power meter 41 shown in FIG. This wattmeter 4
As shown in FIG. 1, reference numeral 1 includes a display unit 2 for switching and displaying various display screens, and an operation unit 43 provided with a plurality of operation switches. Further, as shown in FIG. 3, the power meter 41 includes measurement units UN1 to UN6 (hereinafter, also referred to as “measurement units UN” when not particularly distinguished) capable of measuring a voltage and a current. It can be used individually to perform single-phase measurement, or to perform three-phase four-wire measurement or the like by arbitrarily combining the measurement units UN. Further, the measurement unit UN can set an input range according to the voltage value or the current value of the measurement target signal, and the voltage or the current of the measurement target signal that is 130% or less of the set input range. Input is allowed.
In this case, the wattmeter 41 indicates that the power
The measurement target signal input within the normal input range of 10% or less can be measured with high accuracy, and the measurement accuracy of the measurement target signal outside the normal input range slightly decreases. For this reason, at the time of measurement, it is necessary to set the input range of each measurement unit UN so that the voltage value and current value of the signal to be measured fall within the normal input range of 5 to 110% of the input range.

In order to perform, for example, three-phase four-wire measurement using the wattmeter 41, first, the power switch 7
Is operated, the power meter 41 is activated. Next, by operating the SYSTEM key 44b, the measurement unit U is operated.
The display unit 2 displays a measurement unit combination setting screen (not shown) for setting the combination of N. Next, a combination of the measurement units UN1 to UN3 is set by operating each operation switch of the operation unit 43. continue,
By operating the keys 6a to 6d of the range setting key section 6, the input range of each measurement unit UN is set to match the predicted voltage value (or current value) of the signal to be measured. Thereafter, each measurement unit UN is added to the measurement object.
Is electrically connected to the DISP key 4 of the operation unit 43.
Operate 4a. Thereby, as shown in FIG. 4, the measurement value display screen 50 is displayed on the display unit 2, and the measurement value corresponding to the measurement target signal is displayed in the measurement value display screen 50.

In this case, as shown in FIG. 1, a measured value display screen 50 has a voltage display section 51, a current display section 52, a power display section 53, an instantaneous maximum voltage display section 54, an apparent power display section 55, and an invalid power display section. It comprises a power display section 56 and a power factor display section 57, and displays a voltage value, a current value, a power value, and the like. Specifically, for example, the voltage values measured by the measurement units UN1 to UN3 are “U1” to “U3” of the voltage display unit 51.
Are displayed at the portions corresponding to the measurement units UN, respectively.
The current values measured by 1 to UN3 are indicated by a current display unit 5
2 are displayed at portions respectively corresponding to “I1” to “I3”, and the power value calculated based on the voltage value and the current value measured by the measurement units UN1 to UN3 is “P
1 "to" P3 ".
Further, the sum of the power values further calculated based on the calculated power values is displayed in a portion of the power display unit 53 corresponding to “P123”. In this case, on the measured value display screen 50,
In order to make it easy to read each measurement value, the background is displayed in dark green, and the measurement values, units, ruled lines, and the like of each measurement unit UN are displayed in yellow.

[0005] As described above, in the power meter 41, the measured value measured by each measurement unit UN is measured.
Can be displayed in a list on the display unit 2 in accordance with the combination state of.

[0006]

However, the wattmeter 41 developed by the applicant has the following problems to be improved. That is, in this wattmeter 41, each measurement unit U
When displaying the result of the measurement by N on the display unit 2, the measured value, the unit, the ruled line, and the like are displayed in yellow on a dark green background, so that the measured value is easily displayed. However, for example, the measurement value display screen 5 shown in FIG.
As shown in FIG. 0, even when the measurement is performed in a state where the measurement target signal is not input to any of the measurement units UN, or when the measurement target signal that is out of the normal input range that can be measured with high accuracy is measured, It is displayed in the same color as the measured value of the measurement target signal input within the normal input range. For this reason, at first glance, it may not be noticed that the signal to be measured is not input or that the signal to be measured is out of the normal input range. There is a problem that there is a possibility that it will be.

In the wattmeter 41, as shown in the power factor display section 57 of the measured value display screen 50 in FIG. It is displayed in the same yellow as the displayed part. For this reason, when the number of displayed measurement values is large, there is also a problem that it is difficult for a measurer to see necessary measurement values.

The present invention has been made in view of the above-mentioned points of improvement, and can prevent erroneous measurement and measurement with low accuracy, and can display a measured value necessary for a measurer in a legible manner. The main purpose is to provide a measuring device.

[0009]

According to a first aspect of the present invention, there is provided a measuring apparatus comprising a display control unit for displaying a measurement result corresponding to an input signal to be measured on a display unit. The display control unit displays the measurement result corresponding to the measurement target signal outside the predetermined input range and the measurement result corresponding to the measurement target signal within the predetermined input range on the display unit in a distinguishable manner. And

In this measuring apparatus, when displaying the measurement result corresponding to the input measurement target signal on the display unit, for example,
A measurement result corresponding to a measurement target signal within a predetermined input range that can guarantee high accuracy and a measurement result corresponding to a measurement target signal outside the input range are displayed in a distinguishable manner. In this case, for example, the measurement result corresponding to the signal to be measured out of the input range is displayed in reverse video or blinked. In such a case, the measurer can easily identify the required measurement value. On the other hand, when the measurement value is displayed by inversion or blinking, it can be immediately recognized that the signal to be measured corresponding to the measurement value is out of the predetermined input range, and erroneous measurement or low accuracy Measurement can be avoided.

According to a second aspect of the present invention, in the measurement apparatus according to the first aspect, the display control section converts a measurement result corresponding to a signal to be measured out of a predetermined input range into a measurement target within the predetermined input range. The display unit is characterized in that a display color different from the display color of the measurement result corresponding to the signal is displayed on the display unit.

In this measuring apparatus, for example, a background color is displayed in dark green, a measurement result corresponding to a signal to be measured within a predetermined input range is displayed in yellow, and a measurement object out of the predetermined input range is displayed. The measurement result corresponding to the signal is displayed in red. In this case, the measurement result corresponding to the measurement target signal within the predetermined input range and the measurement result corresponding to the measurement target signal outside the input range can be intuitively identified by the display color. Become.

According to a third aspect of the present invention, in the measurement apparatus according to the first or second aspect, the display control unit displays a measurement result corresponding to the signal to be measured out of a predetermined input range on the measurement result display screen. It is characterized by being displayed in a display color that is close to the background color.

In this measuring apparatus, for example, the background color of the measurement result display screen is displayed in dark green, and the measurement result corresponding to the signal to be measured out of the predetermined input range is displayed in light green, and The measurement result of the measurement target signal input within the input range is displayed in yellow. In this case, it is possible to easily distinguish the measurement result of the measurement target signal input outside the predetermined input range from the measurement result of the measurement target signal input within the predetermined input range. Are displayed such that the measurement result of the signal to be measured out of the predetermined input range becomes the same as the background of the measurement result display screen. For this reason, for example, it is possible to easily recognize only the measurement values required by the measurer without making unnecessary measurement results such as measurement results having low accuracy outside the predetermined input range conspicuous. .

According to a fourth aspect of the present invention, in the measurement apparatus according to any one of the first to third aspects, the display control section determines a measurement result corresponding to a signal to be measured that exceeds a predetermined upper limit value as an upper limit value. It is characterized by being displayed in a display color different from a display color corresponding to a signal to be measured below.

In this measuring apparatus, for example, when a signal to be measured exceeding an allowable upper limit voltage value or the like is input, the measured value is displayed in red or the like different from other measured values below the upper limit value. Therefore, when the measurement value is displayed in red or the like, the measurer can immediately recognize that the measurement target signal corresponding to the measurement value is abnormally high voltage. Therefore, it is possible to prevent a failure of the measuring apparatus due to the input of an abnormally high voltage signal.

According to a fifth aspect of the present invention, in the measuring apparatus according to any one of the first to fourth aspects, a predetermined input range can be changed and set.

In this measuring device, a predetermined input range can be changed and set. Therefore, for example, when measuring the number of measured values within a predetermined input range and the number of measured values outside the input range, the number of measured values distinguished by the display color without reading the measured value itself. Can be measured immediately.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment in which a measuring device according to the present invention is applied to a wattmeter will be described with reference to the accompanying drawings. In addition, the wattmeter 4 which the applicant has already developed
Components having the same functions as those of the first component are denoted by the same reference numerals, and redundant description is omitted.

First, the configuration of the wattmeter 1 will be described with reference to FIGS.
3 will be described.

As shown in FIG. 3, the wattmeter 1 includes measuring units UN1 to UN6, a CPU 15, a ROM 16, a RAM
17, the display unit 2 and the operation unit 3. The measurement units UN1 to UN6 each include a voltage U1 which is a measurement target signal input via a signal cable (not shown).
U6 and the current values of the currents I1 to I6 can be measured. Thus, for example,
Single-phase measurement is performed using the measurement units UN individually, three-phase three-wire measurement is performed by combining the two measurement units UN1 and UN2, and three-phase four-wire measurement is performed by combining the measurement units UN1 to UN3. Or you can. The CPU 15 corresponds to a display control unit in the present invention, and executes calculations of various measured values such as a power value based on a measured value of each measuring unit UN and a power factor, and displays various measured values on the display unit 2. Or let it. ROM 16
The operation program of the CPU 15 is stored.
The calculation result of the CPU 15 and the like are temporarily stored.

The display unit 2 employs a color LCD capable of displaying measured values and the like in multiple colors, and operates to set the measured values of each measurement unit UN and the operating conditions of the wattmeter 1. A screen for setting conditions is displayed. As shown in FIG. 1, the operation unit 3 includes a screen switching key unit 4, a page switching key unit 5, a range setting key unit 6, a power switch 7, and a cursor moving key unit including keys 8a to 8d. 8 are provided.

The screen switching key unit 4 displays a MEAS key 4a for displaying a measured value display screen 20 for displaying the measured value of each measuring unit UN on the display unit 2, and a screen for setting operating conditions. STATUS for display in part 2
The keys 4b are arranged. The page switching key unit 5 includes a key 5a for switching to a page one page before the page currently displayed on the display unit 2 out of a plurality of pages for setting operation conditions, and a page after one page. Key 5b for switching to. The range setting key section 6 includes keys 6a and 6b for setting an input range (corresponding to a predetermined input range in the present invention) for the voltage of each measurement unit UN, and an input range for the current (the present invention). (Corresponding to a predetermined input range) are arranged. Each key 8a to 8d of the cursor moving key unit 8
Are used to move a cursor (not shown) displayed on the display unit 2, and the keys 8a and 8b are used to set a normal input range of an input range described later. In this wattmeter 41, the normal input range is determined by the key 8
Unless changed by a and 8b, the measured value exceeds 5% of the input range, which is a range that can be guaranteed with high accuracy.
% Is automatically set in the range below. However, this normal input range is not limited to the use for guaranteeing the measurement with high accuracy, but can be used for any purpose. For example, as described later, the amplitude of a 100 V AC signal input to the measurement unit UN is ±
It is possible to easily check whether or not the value is out of the range of 10% (or an arbitrary range such as ± 20%).

Next, the measurement value display processing by the wattmeter 1 will be described with reference to the drawings. In the following description,
It is assumed that the measurement unit UN1 to UN3 have already been set by the operator so that three-phase four-wire measurement can be performed by combining the measurement units.

When the power meter 1 is started by operating the power switch 7, the CPU 15 first calculates a measured value of a signal to be measured input to the measuring unit UN. Next, the CPU 15 determines that the signal to be measured is 5% of the input range.
It is determined whether or not the normal input range is within the range of over 110% and below 110% (step 31). When it is determined that all the measured values are within the normal input range, the CPU 1
5 causes the display unit 2 to display the measurement value display screen 20 shown in FIG. In this case, the CPU 15 displays the voltage display unit 21 in the measurement value display screen 20 in the same manner as the power meter 41.
The current display unit 22, the power display unit 23, the instantaneous maximum voltage display unit 24, the apparent power display unit 25, the reactive power display unit 26, and the power factor display unit 27 are displayed, and the voltage value, the current value, Display the power value, etc. CPU1
5 displays the background on the measurement value display screen 20 in dark green, and displays the measurement values, units, ruled lines, and the like corresponding to the measurement target signal input to each measurement unit UN in yellow (step 32). On the other hand, the power factor display 27
For example, a display portion for which display is not specified at the time of measurement is displayed in light green close to the background color.

When it is determined in step 31 that there is a signal to be measured that is not input within the normal input range, the CPU 15 determines whether the signal to be measured is within the allowable input range within 130% of the input range. Is determined (step 33). If the CPU 15 determines that the measured value is within the range, that is, within 5% or less of the input range or within a range exceeding 110% and within 130%, the CPU 15 cannot measure the measured value with high accuracy. The measured value is displayed in a display color that means that
4). In this case, as shown in the abnormal display 28 on the measurement value display screen 20 in FIG. 3, the CPU 15 determines the measurement value and various measurement values calculated based on the measurement value, that is, the three-phase four-line Average voltage "U123",
The average current “I123”, the total power “P123”, the total apparent power “S123”, and the total reactive power “Q123” are displayed in a light green color close to the background color of the measurement value display screen 20. In this example, since no measurement target signal has been input to the measurement unit UN3, various measurement values based on the measurement values of the measurement unit UN3 are displayed on the abnormality display 28, and in FIG. Are displayed in dark green as a background color, and white characters are displayed in light green.

When it is determined in step 33 that there is a signal to be measured that is not within the allowable input range,
That is, when determining that there is a measured value exceeding 130% of the input range, the CPU 15 determines that the measured value exceeds the upper limit of the allowable input range of the measuring unit UN.
The measured value is displayed in red which means a warning (step 35). Thereafter, the CPU 15 continues until the measurement is completed.
The determination and processing of steps 31 to 35 are repeated.

In the power meter 41, the keys 8a, 8
The normal input range can be appropriately changed and set using b. In this case, the measured value within the input range set appropriately,
In the case where the number of measured values outside the input range is measured, the number of measured values distinguished by yellow or light green can be immediately measured without reading the measured value itself.

As described above, in the wattmeter 1, the measured value corresponding to the signal to be measured out of the normal input range and various measured values calculated based on the measured value are as follows.
By displaying the measurement value in a display color different from the measurement value within the normal input range, the measurement value displayed on the display unit 2 is displayed to the operator as a measurement value with a high measurement accuracy or a measurement value with a slightly lower measurement accuracy. Whether the value is a value can be instantaneously determined. For measurement values with slightly lower measurement accuracy,
By displaying a light green color close to the background color and assimilating the measured value to the background, the measured value required for the measurer can be displayed in a legible manner. As a result, the measurer can quickly and accurately read only the measurement values with high measurement accuracy. In addition, when the measurement value is displayed in red, the operator can immediately recognize that the signal to be measured corresponding to the measurement value is abnormally high voltage or large current, so that the abnormally high value is displayed. Failure of the wattmeter 41 due to input of a voltage or large current signal to be measured can be prevented from occurring.

The present invention is not limited to the configuration shown in the above embodiment of the present invention. For example, in the embodiment of the present invention, the abnormal display 28 is displayed in a light green color close to the background color. Alternatively, the display may be performed by changing the display font or the thickness of the character. Further, the display color and the background color of each measurement value shown in the embodiment of the present invention are not limited thereto, and, for example, when the display unit 2 is a monochrome display, the measurement value may be changed by changing the gradation. May be displayed. Further, in the embodiment of the present invention, the example in which the display unit 2 is integrated with the wattmeter 1 has been described. However, the display unit 2 may be configured to display the measured value on a display external to the device connected via a signal cable. Can also.

Further, the present invention is not limited to the power meter shown in the embodiment of the present invention, but may be a voltmeter, an ammeter, a multimeter,
Also, it can be suitably used for other measurement devices such as a waveform display device and a waveform recording device. Furthermore, in the embodiment of the present invention, an example in which a numerical value is displayed as a measurement result has been described. However, when the present invention is applied to a waveform display device, a waveform recording device, or the like, a signal to be measured within a predetermined input range is measured. It is also possible to display the waveform and the waveform of the signal to be measured out of the input range in a distinguishable manner.

[0032]

As described above, according to the measuring apparatus of the first aspect, the display control unit can measure the measurement result corresponding to the signal to be measured out of the predetermined input range and the measurement result within the predetermined input range. By displaying the measurement result corresponding to the target signal on the display unit in an identifiable manner, the measurer can easily identify the required measurement value. At the same time, it is possible to immediately recognize that a measurement target signal that is out of the predetermined input range is being input, so that erroneous measurement or measurement with low accuracy can be avoided.

According to the measuring device of the second aspect,
The display control unit causes the display unit to display the measurement result corresponding to the measurement target signal outside the predetermined input range in a display color different from the display color of the measurement result corresponding to the measurement target signal within the predetermined input range. Accordingly, the measurement result corresponding to the measurement target signal within the predetermined input range and the measurement result corresponding to the measurement target signal outside the input range can be intuitively identified by the display color.

According to a third aspect of the present invention, the display control section displays the measurement result corresponding to the signal to be measured out of the predetermined input range in a display color approximating the background color of the measurement result display screen. By displaying in, for example, it is possible to easily recognize only the measurement values required by the operator without making unnecessary measurement results such as measurement results having low accuracy outside the predetermined input range conspicuous. it can.

According to the measuring device of the fourth aspect,
The display control unit displays the measurement result corresponding to the measurement target signal exceeding the predetermined upper limit value in a display color different from the display color corresponding to the measurement target signal equal to or less than the upper limit value. It is possible to immediately recognize that an abnormally high voltage measurement target signal exceeding a value or the like has been input, thereby preventing a failure of the measurement device from occurring.

According to the measuring device of the fifth aspect,
By configuring the input range to be changeable,
In the case of measuring the measured value within the predetermined input range and the number of the measured values outside the input range, for example, the measurer does not need to read the measured value itself, and the measurement is performed by the display color. The number of values can be measured immediately.

[Brief description of the drawings]

FIG. 1 is a front view of a power meter according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a measured value display process by the wattmeter according to the embodiment of the present invention.

FIG. 3 is a block diagram showing an electric configuration of the wattmeter according to the embodiment of the present invention and a conventional wattmeter.

FIG. 4 is a front view of a conventional measuring device.

[Description of Signs] 1 Wattmeter 2 Display section 6 Range setting key section 8 Cursor moving key section 15 CPU 20 Measurement value display screen 21 Voltage display section 22 Current display section 23 Power display section 24 Instantaneous maximum voltage display section 25 Apparent power display 26 Reactive power display 27 Power factor display 28 Abnormal display

Claims (5)

[Claims] 1. A measuring apparatus comprising: a display control unit for displaying a measurement result corresponding to an input measurement target signal on a display unit, wherein the display control unit determines a measurement target signal out of a predetermined input range. A measuring apparatus, wherein the corresponding measurement result and the measurement result corresponding to the signal to be measured within the predetermined input range are displayed on the display unit in a distinguishable manner. 2. The display control section according to claim 1, wherein the display unit displays the measurement result corresponding to the measurement target signal out of the predetermined input range in a display color of the measurement result corresponding to the measurement target signal in the predetermined input range. The measurement device according to claim 1, wherein the display unit displays the display in a display color different from the display color. 3. The display control unit according to claim 2, wherein the display unit displays the measurement result corresponding to the signal to be measured out of the predetermined input range in a display color similar to a background color of a measurement result display screen. 3. The measuring device according to claim 1, wherein 4. The display control unit displays the measurement result corresponding to the measurement target signal exceeding a predetermined upper limit value in a display color different from the display color corresponding to the measurement target signal equal to or less than the upper limit value. The measurement device according to claim 1, wherein the measurement device is displayed. 5. The measuring apparatus according to claim 1, wherein the predetermined input range is configured to be changeable.