JPH0968438A - Electric measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electric measuring apparatus in which an input range unit pan be changed simply into a unit name corresponding to a physical quantity to be measured and whose operating convenience for a user is enhanced by a method wherein a unit name column is formed in a prescribed region on a setting display screen. SOLUTION: In a setting display screen 14a at a voltage input-type electric measuring apparatus, two input channels ch1, ch2 are prepared. A voltage in a line to be measured is inputted to the channel ch1 on one side, and a current in a line to be measured is inputted to the channel ch2 on the other side via a clamp probe or the like. When the current is inputted to the channel ch2, an input range unit for the channel ch2 is changed into a 'current' from a 'voltage'. In order to change the unit, a cursor mark is moved onto the 'voltage' for the channel ch2. Then, the cursor is moved to a unit name display column 141, and a 'current' is designated out of a 'voltage' and a 'current' in the column. Thereby, the input range unit for the channel ch2 is changed into the 'current'.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric measuring instrument,
More specifically, the present invention relates to an electric measuring instrument which is basically a voltage input type, but which can set a range unit of an input channel to a unit name unique to a physical quantity to be measured.

[0002]

2. Description of the Related Art In a voltage input type electric measuring instrument, when measuring a physical quantity such as current, temperature, pressure or magnetic field, the physical quantity is converted into a voltage signal via a sensor and inputted. For example, when measuring a current, a clamp probe is used as a sensor as shown in FIG. 3, and its output voltage is used as an input signal.

However, when the physical quantity to be measured is displayed on a display or recording paper, the actual measurement value is displayed as a current by the scaling function. For example, 2A
When a clamp probe that outputs (ampere) as 1 V (volt) is used and its output voltage is 1.5 V, the display value is 3 A.

[0004]

As described above, since the voltage input type is basically used, the unit of the input range is the voltage display regardless of the scaling. That is, although the measured value is certainly a current display, the input range unit is a voltage display, which may cause a user operational confusion. In particular, when measuring current such as in harmonic analysis, if the range is set on the voltage display,
There was a problem that it was difficult to understand the relationship between the voltage and the current. This means that the measured physical quantity is not only the current,
The same applies to the case of temperature and pressure.

The present invention has been made in order to solve such a conventional drawback, and an object thereof is to, when measuring a physical quantity other than voltage, change an input range unit to a unit name corresponding to the measured physical quantity. The purpose of the present invention is to provide an electric measuring instrument which can be easily changed and is convenient for the user.

[0006]

In order to achieve the above object, the invention of claim 1 is provided with a measuring section having a plurality of input channels, and in the case of measuring a physical quantity such as current, temperature or pressure other than voltage, In a voltage input type electrical measuring device in which the measured physical quantity is converted into a voltage through a sensor and is input to a predetermined input channel of the measuring unit, at least an input range unit and per 1 volt for each input channel A setting display screen for displaying the scaling value of is displayed, and a unit name display field for displaying each unit name of the measured physical quantity is provided in a predetermined display area of the setting display screen. By specifying the unit name corresponding to the measured physical quantity of, the input range unit of the input channel to which the measured physical quantity is input is specified. Position is characterized in that it has to be renamed.

That is, in the case of the voltage input type, the input range unit of the input channel is "voltage" display. According to this, for example, when measuring a current through a clamp probe, the unit name display field By specifying the unit name corresponding to the physical quantity to be measured, that is, the current, the input range unit of the input channel to which the clamp probe is connected is changed from "voltage" to "current".

According to the invention of claim 2, the input range unit is changed to a designated unit name,
The scaling value per 1 volt is also changed to the unit name.

That is, as a result, for example, the scaling value displayed as 1V → 1V is changed to 1A → 1V. Then, the calculation is performed with this changed scaling value, and A (ampere)
The measured value is displayed in the unit name of.

Further, according to the invention of claim 3, as the input range unit is changed to the designated unit name, a sub-screen having a number string for setting a scaling value is displayed in the setting display screen. The scaling value is set to the specified numerical value by specifying an arbitrary numerical value from within the numerical string.

According to this, the scaling value is set as 2A.fwdarw.1V by designating "2" from the numeral string displayed in the child screen, for example, 0-9.
This means that 1 V input corresponds to 2 A.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described for better understanding of the technical concept of the present invention. First, as a premise, the electric measuring instrument of the present invention has a plurality of input channels, and basically, as described in FIG. 3, a sensor corresponding to various physical quantities such as current, temperature, and pressure is used. It is a voltage input type electrical measuring instrument which converts into a voltage and inputs it to a measuring section through a predetermined input channel.

FIG. 1 shows a block diagram used for setting an input range unit and its scaling value for the input channel, and FIG. 2 shows an input range incorporated in the block diagram. A setting display screen of the display unit 14 is shown.

First, FIG. 2A shows a basic setting display screen 14a of this voltage input type electric measuring instrument. This example is for performing harmonic analysis. In this case, two input channels, ch1 and ch2, are prepared.
The voltage of the line to be measured is input to one input channel ch1 through an amplifier or an A / D converter, while the current of the line to be measured is input to the other input channel ch2 as shown in FIG. For example, it is assumed that the input is made via a clamp probe.

Even if the current of the line to be measured is input to the input channel ch2, it is usually a voltage input type as shown in FIG. Is “voltage”, and the scaling value is also displayed as 1V → 1V in the voltage display.

On the same setting display screen, div
In the (maximum) column, both input channels ch1 and ch2 are displayed as 1Vr (6), but this is a waveform display screen (not shown), and 1V per scale of the level axis (Y axis), and , Which means that the maximum value is 6V.

In the present invention, in order to be able to change the unit name according to the physical quantity to be measured, the unit name is set in a predetermined display area in the setting display screen 14a of FIG. A display field 141 is provided, and “voltage” and “current” are displayed as physical quantities designated therein. If necessary, other physical quantities such as "temperature (unit name ° C)" and "pressure (unit name eg kg)" may be displayed.

In this example, the input channel ch2
Since a current is input to the input channel via the clamp probe, the input range unit of the input channel ch2 can be changed from "voltage" to "current" accordingly.

The unit of the input range is changed by the operation unit 11 of FIG. 1, and the procedure will be described below. Although not shown in detail, the operation unit 11 is provided with a mouse and a ten-key pad for operating a cursor mark. First, the mouse mark is operated to display the cursor mark as an input range unit of the input channel ch2. On the "voltage" and press the click button to fix the indicated position. In addition, this cursor mark presents a well-known black solid painting, for example, a square,
Characters such as those designated by this are displayed in black and white in reverse.

Next, the cursor mark is moved to the unit name display field 141 at the bottom of FIG. 2A, and "current" is designated from "voltage" and "current" in the unit name display field. To do. As a result, as shown in FIG. 2C, the input range unit of the input channel ch2 is changed from "voltage" to "current" display.

Along with this, a child screen 14b as shown in FIG. 2B appears at a predetermined portion of the setting display screen 14a. This child screen 14b is a table for changing the scaling value, and in this example, a series of numbers 0 to 9 is displayed.

If, for example, "2" is designated from the sequence of numbers with the cursor mark, scale = 2 is set, and as shown in FIG. 2C, the scaling value of the input channel ch2 is set. Is displayed as 2A → 1V. This means that an input voltage of 1 V corresponds to a current value of 2 A, so the display in the div / (max) column also shows 2 Ar.
(12). That is, one scale on the level axis (Y axis) of the waveform display screen (or recording paper) not shown is 2A.
The maximum value is 12A.

After setting the range unit and the scaling value in the operation unit 11 in this way, if the input range for the input channel ch2 is set from the operation unit 11, the input range setting unit 12 displays the range information. Based on this, the amplification degree of the amplifier AMP of the input channel ch2 is set. It should be noted that the range unit and the scaling value are retained unless they are changed by the user.

On the other hand, in the scaling calculation section 13, the scaling value set in the input range setting section 12 (2A →
1V) is the initially set scaling value (1V → 1V)
Scaling is carried out by and the result is sent to the input range display unit 14 and various arithmetic processing units 15.

The input range display unit 14 is the operation unit 11
2 by the display switching signal from the setting display screen 1 in FIG.
4a is switched to a waveform display screen (not shown), and the waveform display screen has a horizontal axis (X axis) on the time axis and a vertical axis (Y axis).
Is set to 1A on the scale 2A, and a waveform display area having a maximum value of 12A is set.

As described above, in this example, even in the case of the voltage input type electric measuring instrument, the input range unit is displayed as "current" in the input channel ch2, and its waveform display is also in the current range. Since it is displayed in a scaled state, the user can directly input the current without any conversion operation.

In the above example, only two unit names of "voltage" and "current" are displayed in the unit name display field 141, but other physical quantities such as temperature, pressure and magnetic field can be prepared. , Can handle a wider range of physical quantity measurements.

[0028]

As described above, according to the present invention,
The following effects are obtained. That is, in the case of the voltage input type, the input range unit of the input channel is “voltage” display, but according to the invention of claim 1, for example, when measuring a current through a clamp probe, the unit name display field By specifying the unit name corresponding to the physical quantity to be measured, that is, the current, the input range unit of the input channel to which the clamp probe is connected is changed from "voltage" to "current". It is possible to give an image in which the current to be measured can be directly input without feeling confused. This is important for the operation of the equipment.

Further, according to the invention of claim 2, the scaling value per 1 volt is changed to the unit name as the input range unit is changed to the designated unit name. The scaling value displayed as → 1V will be changed to 1A → 1V, and the calculation will be performed with this changed scaling value, and the measured value will be the unit name of A (ampere). Is displayed, the effect of the invention of claim 1 is further promoted.

Further, as the input range unit is changed to the designated unit name, a sub-screen having a numerical string for setting the scaling value is displayed in the setting display screen, and from the numerical string. According to the invention of claim 3, the scaling value is set to the specified numerical value by designating an arbitrary numerical value. The scaling value can be set very easily.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an input section of an electric measuring instrument of the present invention.

FIG. 2 is an explanatory diagram showing an example of a setting display screen according to the present invention.

FIG. 3 is a schematic block diagram showing a configuration of an input unit of a voltage input type electric measuring instrument.

[Explanation of symbols]

 11 Operation Unit 12 Input Range Setting Unit 13 Scaling Calculation Unit 14 Input Range Setting Unit 14a Setting Display Screen 141 Unit Name Display Field 15 Various Calculation Processing Units

Claims (3)

[Claims] 1. When a measuring unit having a plurality of input channels is provided and a physical quantity other than voltage, such as current, temperature or pressure, is measured, the measured physical quantity is converted into a voltage through a sensor, and the measured quantity of the measuring section is changed. A voltage input type electrical measuring instrument adapted to input to a predetermined input channel is equipped with a setting display screen that displays at least the input range unit and the scaling value per 1 volt for each input channel. By providing a unit name display field in which each unit name of the measured physical quantity is displayed in a predetermined display area, and specifying the unit name corresponding to the predetermined physical quantity to be measured from this unit name display field, the measured An electric measuring instrument characterized in that an input range unit of an input channel for inputting a physical quantity is changed to a designated unit name. 2. The scaling value per 1 volt is changed to the unit name as the input range unit is changed to the designated unit name.
The electric measuring instrument described in. 3. As the input range unit is changed to a designated unit name, a sub-screen having a numerical string for setting a scaling value is displayed in the setting display screen, and from the numerical string The electrical measuring instrument according to claim 1 or 2, wherein the scaling value is set to the designated numerical value by designating an arbitrary numerical value.