JP4334708B2 - measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a measuring apparatus that starts measurement of electrical parameters between an electrode part and a predetermined part when the electrode part is pressed.
[0002]
[Prior art]
As this type of measuring device, the applicant has already developed an ohmmeter 31 shown in FIG. The ohmmeter 31 is a measuring device configured to be able to measure, for example, the human body resistance between the fingertip and the sole of the measurement subject, and is arranged so as to be able to contact the ohmmeter body 31a and the sole of the measurement subject. And an electrode plate (not shown) connected to the resistance meter main body 31a. In this case, the ohmmeter main body 31a is provided with the touch panel 2 that is electrically connected to the fingertip of the measurement subject and the display unit 4 that displays the measurement value. In the ohmmeter 31, when the measurement subject is on the electrode plate and presses the touch panel 2 with a fingertip, the resistance value 31 is automatically measured after the ohmmeter 31 is turned on. In this state, by continuously pressing the touch panel 2 for 1 second, for example, the resistance value measurement between the touch panel 2 and the electrode plate (that is, between the fingertip and the sole) is completed, and the measured value is displayed on the display unit 4. In this case, the measurement value displayed on the display unit 4 is displayed until the measurement subject releases the fingertip from the touch panel 2, and when the fingertip is released from the touch panel 2, the power source of the ohmmeter 31 is cut off and the display unit is displayed. The display of 4 is deleted.
[0003]
[Problems to be solved by the invention]
However, the resistance meter 31 already developed by the applicant has the following problems to be improved. That is, in the ohmmeter 31, when the measurement subject presses the touch panel 2 with the fingertip for 1 second until the measurement is completed, the resistance value between the fingertip and the sole is measured, and the measured value is displayed on the display unit 4. Is done. However, when the pressing force of the touch panel 2 changes before the measurement is completed, the contact resistance between the fingertip and the touch panel 2 varies. In such a case, it is difficult to accurately measure the resistance value, and an incorrect resistance value may be displayed on the display unit 4. Further, when the fingertip is released from the touch panel 2 before the measurement is completed, the power is cut off and the measurement is stopped. Therefore, for the measurement subject unfamiliar with the operation, the measured value is displayed on the display unit 4 for any reason. It is difficult to determine whether is not displayed. Furthermore, even after the measurement of the resistance value is completed, when the fingertip is removed from the touch panel 2, the power supply is cut off and the measurement value displayed on the display unit 4 is erased. Therefore, the measurement subject has to keep pressing the touch panel 2 until the measurement value is read, and there is a problem that the operation is complicated.
[0004]
The present invention has been made in view of such a problem, and a main object of the present invention is to provide a measuring apparatus capable of accurately measuring an electrical parameter. Another object of the present invention is to provide a measuring device that facilitates confirmation of measurement results.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a measuring apparatus according to claim 1 includes a conductive electrode portion and an automatic return type switch that is operated in an on state or an off state when pressed by a measurement object through the electrode portion. And a control unit that causes the measurement unit to measure the electrical parameter between the electrode unit and the predetermined part when the switch unit is operated and to notify the measurement unit of the measurement result. Then, the control unit automatically returns the switch unit before satisfying one of the conditions that a predetermined time has elapsed since the operation of the switch unit and that the measured value of the electrical parameter being measured is stable. Sometimes, the notifying means is notified of a measurement error as a measurement result. In addition, the notification of the measurement result in the present invention includes notification of a measured value when normally measured and notification of an error when not measured normally. The notification method includes notification by displaying characters and symbols, notification by sound, notification by light such as lighting or blinking of an LED or the like.
[0006]
The measuring apparatus according to claim 2 is characterized in that, in the measuring apparatus according to claim 1, the control unit causes the notifying means to notify the measurement result continuously for a predetermined time from the time when the switch means automatically returns. To do.
[0007]
The measuring apparatus according to claim 3 is the measuring apparatus according to claim 1 or 2, wherein the control unit controls activation of at least one of the measuring unit and the notifying unit based on a switch signal of the switching unit. .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS A preferred embodiment of the invention in which a measuring device according to the invention is applied to an ohmmeter 1 will be described below with reference to the accompanying drawings. In addition, about the component which is common with the ohmmeter 31 which the applicant has already developed, the common code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.
[0009]
First, the configuration of the ohmmeter 1 will be described with reference to FIG.
[0010]
As shown in the figure, the ohmmeter 1 includes an ohmmeter body 1a and an electrode plate 1b connected to the ohmmeter body 1a and formed of a conductive material such as conductive rubber. 1a includes a touch panel 2, a control unit 3, a display unit 4, an operation unit 5, a constant current source 6, a voltage measurement unit 7, a RAM 8, a ROM 9, and a momentary type (automatic return type) push switch SW. Yes. In this case, the touch panel 2 is disposed on the front panel of the ohmmeter body 1a, and when the fingertip of the measurement subject H is pressed, the touch panel 2 is electrically connected to the fingertip and presses the push switch SW.
[0011]
The control unit 3 maintains the sleep mode during standby (non-measurement), and when the touch panel 2 is pressed and the ON signal SON is output from the push switch SW, the control unit 3 shifts to the normal operation mode and controls each unit. Control startup. At this time, the control unit 3 controls the constant current source 6 and the voltage measuring unit 7 to measure the resistance value between the touch panel 2 and the electrode plate 1b, and displays the measured value or a measurement error display described later. Is displayed on the display unit 4. Further, when the push switch SW is released and the output of the ON signal SON is stopped, the control unit 3 maintains the normal operation mode for a predetermined time (for example, 5 seconds) and continues for the predetermined time. Then, the measurement value and measurement error display are displayed on the display unit 4. The display unit 4 displays measurement values, measurement error displays, and the like under the control of the control unit 3. The operation unit 5 is arranged on the front panel of the ohmmeter body 1a in which a plurality of keys for setting the operating conditions of the ohmmeter 1 are arranged. The constant current source 6 outputs a weak DC constant current to the touch panel 2 and the electrode plate 1b under the control of the control unit 3. The voltage measuring unit 7 repeatedly measures the voltage between the touch panel 2 and the electrode plate 1b every predetermined time, and outputs the measured value to the control unit 3. The RAM 8 temporarily stores the calculation result of the control unit 3, and the ROM 9 stores the operation program of the control unit 3.
[0012]
Next, a method for measuring human resistance using the ohmmeter 1 will be specifically described with reference to FIG.
[0013]
First, the person H to be measured presses the touch panel 2 with a fingertip while riding on the electrode plate 1b barefoot. In this state, the fingertip of the person to be measured H and the touch panel 2 are in close contact with each other and are electrically connected, and the push switch SW is turned on by the pressing. Accordingly, the control unit 3 detects the ON signal SON output from the push switch SW, and activates the constant current source 6 and the voltage measurement unit 7, thereby outputting the measurement current IH from the constant current source 6. At the same time, the voltage measurement unit 7 starts voltage measurement. At this time, the current IH output from the constant current source 6 conducts the measurement subject H from the touch panel 2 via the fingertip, and conducts from the sole of the measurement subject H to the electrode plate 1b. Therefore, a voltage value obtained by multiplying the human body resistance value by the current value of the current IH is generated between the touch panel 2 and the electrode plate 1b. For this reason, the voltage measurement unit 7 repeatedly measures the voltage VH between the touch panel 2 and the electrode plate 1b every predetermined time and outputs the voltage VH to the control unit 3. On the other hand, the control unit 3 determines the resistance value between the touch panel 2 and the electrode plate 1b based on the current value of the current IH and the voltage VH measured by the voltage measurement unit 7, that is, the fingertip and foot of the measurement subject H. The human resistance between the back is calculated repeatedly.
[0014]
In this case, normally, for example, a wait time of about 1 second is required before obtaining a stable value in which the fluctuation range of the measured value in the repeated measurement is within a range of ± 10%, for example. Therefore, when the fingertip of the person to be measured H is released from the touch panel 2 before the waiting time has elapsed, the reliability of the measurement value is lowered. Even when the wait time has elapsed, when the pressing force of the measurement subject H with respect to the touch panel 2 changes, the measurement value also varies due to the variation in the contact resistance. Therefore, also in this case, the reliability of the measured value is lowered. For this reason, the control unit 3 does not satisfy any of the conditions that a predetermined time (1 second wait time in this example) has elapsed since the operation of the push switch SW and that the resistance value during measurement is stable. When the output of the ON signal SON by the push switch SW is stopped, the operation of the constant current source 6 and the voltage measuring unit 7 is stopped, and then a measurement error is displayed on the display unit 4 (for example, “ERROR” message). Is continuously displayed for, for example, 5 seconds (hereinafter, the time of 5 seconds is also referred to as “display maintenance time”). Next, when the display maintenance time has elapsed, the control unit 3 shuts off the power of each unit and then shifts to the sleep mode.
[0015]
As a result, display of erroneous measurement values on the display unit 4 is prevented. Further, even for a measurement subject H who is unfamiliar with the operation, the measurement error display is continuously displayed for the display maintenance time so that the reason why the measurement value is not displayed on the display unit 4 can be recognized quickly and easily. Can do. Thereafter, the measurement subject H presses the touch panel 2 again to execute the measurement, whereby the correct resistance value is measured and displayed on the display unit 4.
[0016]
On the other hand, when the ON signal SON of the push switch SW is continuously output for one second from the start of the measurement and the measured value is stable, the control unit 3 assumes that the measurement has been normally executed. The measured value is displayed on the display unit 4 as a numerical value. Thereafter, when the fingertip of the person H to be measured leaves the touch panel 2, the control unit 3 stops the operation of the constant current source 6 and the voltage measurement unit 7, and then displays the measured value on the display unit 4. Display continuously. Next, when the display maintenance time has elapsed, the power of each unit is shut off, and then the mode shifts to the sleep mode. In this case, in the ohm meter 1, the display maintenance time can be arbitrarily set by operating a predetermined key of the operation unit 5. Therefore, for example, when it is not necessary to continuously display the measurement value for a long time, energy saving can be achieved by setting the display maintenance time short. In addition, for example, when the displayed resistance value is transcribed on a recording sheet, the measurement target person H can reliably transcribe the measurement value without rushing by setting the display time to be long. it can.
[0017]
As described above, in the ohmmeter 1, by displaying the measurement error display on the display unit 4 when there is a possibility that the reliability of the measurement value is low, erroneous measurement can be avoided and the measurement can be performed again. Can be urged. Even if the fingertip is removed from the touch panel 2, the measurement value is continuously displayed on the display unit 4 for the display maintenance time, so that the measurement value can be read very easily.
[0018]
The present invention is not limited to the configuration shown in the above-described embodiment of the present invention. For example, in the embodiment of the present invention, an example in which the push switch SW is turned on by pressing the touch panel 2 and each unit is activated in response thereto is described. However, a power switch different from the push switch SW is provided. The power switch may be configured to be capable of switching control of power-on and power-off of the entire apparatus. As a measurement method of the measurement value, a method of measuring at a time when a predetermined time (for example, 1 second) elapses from when the ON signal SON is output from the push switch SW can be adopted. In this case, it is preferable that the control unit 3 displays the measurement error display on the display unit 4 when the output of the ON signal SON by the push switch SW is stopped before the predetermined time has elapsed. Of course, the measurement method itself is not limited.
[0019]
Furthermore, although the example of measuring the resistance between the fingertip and the sole of the measurement subject H has been described in the embodiment of the present invention, the measurement by the ohmmeter 1 is not limited between the fingertip and the sole. For example, it is possible to measure the insulation resistance between the fingertip of the person H to be measured wearing the insulating shoes and the insulating shoes, the amount of static electricity stored in the human body, and the current value and voltage value. You can also
[0020]
【The invention's effect】
As described above, according to the measuring apparatus of the first aspect, the control unit can determine whether the predetermined time has elapsed since the operation of the switch means or the measured value of the electrical parameter being measured is stable. When the switch means automatically returns before satisfying such a condition, it is possible to avoid erroneous measurement of electrical parameters by causing the notification means to notify a measurement error as a measurement result. In addition, by notifying the operator of the measurement error, it is possible to prompt the measurement again, so that the electrical parameter can be measured accurately.
[0021]
In addition, according to the measuring apparatus of the second aspect, by notifying the measurement result from the time when the switch means automatically returns until the elapse of a predetermined time, it is possible to reliably recognize that there was a measurement result or a measurement error. it can.
[0022]
Furthermore, according to the measurement device of claim 3, the control unit controls the activation of at least one of the measurement unit and the notification unit based on the switch signal of the switch unit, thereby reducing the power consumption of the measurement device. it can.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a configuration of an ohmmeter 1 according to an embodiment of the present invention.
FIG. 2 is an external view of an ohmmeter 31 already developed by the applicant.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resistance meter 1b Electrode board 2 Touch panel 3 Control part 4 Display part 6 Constant current source 7 Voltage measurement part H Measuring object SW Push switch

Claims (3)

A conductive electrode unit, an automatic return type switch unit that is operated to be turned on or off when pressed by the measurement object through the electrode unit, and the electrode when the switch unit is operated. And a control unit that causes the measurement unit to measure the electrical parameter between the unit and the predetermined part and also notifies the measurement result to the notification unit,
The control unit automatically restores the switch means before satisfying any one of the conditions that the predetermined time has elapsed from the time of operation of the switch means and the measured value of the electrical parameter being measured is stable. When this is done, the measuring device is notified of the measurement error as the measurement result. The measurement apparatus according to claim 1, wherein the control unit causes the notification unit to notify the measurement result continuously for a predetermined time from the time when the switch unit automatically returns. The measurement apparatus according to claim 1, wherein the control unit controls activation of at least one of the measurement unit and the notification unit based on a switch signal of the switch unit.

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