JP2013092477A - Measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring instrument that enables a measuring person to easily recognize a measurement result or a state of the measuring instrument without moving the eyes from a measurement place apart from a measuring instrument body while applying a contact end of a test lead to the measurement place.SOLUTION: A measuring instrument 1 including a measuring instrument body 10, a display part 16 provided to one side face of the measuring instrument body 10 and displaying information, and a test lead 14 connected to the measuring instrument body 10 includes: irradiation means 18 provided to the measuring instrument body 10 to irradiate a part before a measuring person while being held before the measuring person with the display part 16 being directed upward; and a control part 11 provided to the measuring instrument body 10 that changes irradiation states of light by the irradiation means 18 according to a result of measurement made by using the test lead 14 or the state of the measuring instrument 1.

Description

  The present invention relates to a measuring instrument having a test lead that is a probe drawn out from a measuring instrument main body via a lead wire, and more specifically, to a measurer in addition to the display on the display of the measuring instrument main body. The present invention relates to a measuring instrument having a function of notifying a measurement result or a state of the measuring instrument.

  2. Description of the Related Art Conventionally, for example, there is an insulation resistance meter that measures an insulation resistance that is grasped as a ratio between an applied voltage and a leakage current with respect to an object to be measured (measured electric device or circuit under measurement). The insulation resistance meter measures the insulation resistance of the measurement target from the ratio between the rated measurement voltage applied to the measurement target and the current (leakage current) flowing through the measurement target when the voltage is applied.

  As the insulation resistance meter as described above, a reference value is stored in the storage unit for each rated measurement voltage applied to the measurement target, and the measured value of the insulation resistance measured by applying the specified rated measurement voltage to the measurement target. Some (insulation resistance value) are compared with a reference value, and a determination result based on the comparison is displayed on a display unit provided in the measuring instrument body (insulation resistance determination). For example, as shown in FIG. 4, when the insulation resistance value is less than the reference value, “FAIL (or Lo)” (FIG. 4A), and when the insulation resistance value is greater than the reference value, “PASS”. (Or Hi) "(FIG. 4 (b)), and displayed on the display unit 201 of the measuring instrument main body 200, such as a liquid crystal display panel. In addition to or in addition to the above-described display, there is a device that sounds a buzzer according to a determination result (see Patent Document 1).

  According to this, the insulation resistance value itself is simply displayed on the display unit, and the measurer is compared with the one that the measurer must determine whether the insulation resistance value is greater than or less than the reference value. However, since the determination result by comparing the insulation resistance value with the reference value can be recognized immediately, a clear and quick determination is possible.

JP 2000-214194 A

  However, the above conventional technique has the following problems to be improved.

  That is, in order to make an insulation resistance determination with an insulation resistance meter as shown in FIG. 4, for example, when the determination result is displayed only on the display unit, place the contact end of the test lead on the measurement location and press the measurement switch Thus, it is necessary to start the measurement, and then visually check the determination result displayed on the display unit of the measuring instrument main body. Therefore, in this case, in order to know the determination result, the measurer must move his / her eyes to the display unit of the measuring instrument main body while bringing the contact end of the test lead into contact with the measurement location. For this reason, while looking at the display of the measuring instrument body, the test lead contact end may be accidentally separated from the measurement location, or may be applied to an undesired location (for example, an insulation portion). The result may be wrong.

  Further, as described above, the buzzer may notify the determination result. For example, in a measurement environment where noise (noise) is large such as a production line or outdoors, it is difficult to hear the buzzer sound, so the determination result may be erroneous.

  In the above, the problem in the conventional measuring device has been described by taking the insulation resistance determination using the insulation resistance meter as an example, but while performing the operation of applying the contact end of the test lead to the measurement location separated from the measuring device main body, A similar problem may occur in a scene where it is necessary to recognize a notification result output from the measuring instrument when a predetermined condition that has been set is satisfied (occurrence or non-occurrence of a certain event).

  Therefore, the object of the present invention is to easily measure the measurement result or the state of the measuring instrument without the need for the measurer to remove the line of sight from the measuring point while performing the operation of applying the contact end of the test lead to the measuring point spaced from the measuring instrument body. It is to provide a measuring device that can be recognized.

  The above object is achieved by a measuring instrument according to the present invention. In summary, the present invention provides a measuring instrument having a measuring instrument main body, a display unit for displaying information provided on one side of the measuring instrument main body, and a test lead connected to the measuring instrument main body. In the above, a measurement result performed using the test lead with the irradiation means provided in the measuring device main body for irradiating the front of the measurer with the display unit facing upward, A control unit provided in the measuring device main body for switching the irradiation state of the light by the irradiation unit according to the state of the measuring device.

  According to the present invention, it is possible to easily recognize the measurement result or the state of the measuring instrument without the need for the measurer to remove the line of sight from the measuring point while performing the operation of applying the contact end of the test lead to the measuring point spaced from the measuring instrument body. It becomes possible.

It is a general | schematic functional block diagram of the insulation resistance meter which concerns on one Example of this invention. It is a front view of the insulation resistance meter which concerns on one Example of this invention. It is a schematic diagram for demonstrating the irradiation state of the light in one Example of this invention. It is a schematic diagram for demonstrating an example of the display result of the conventional insulation resistance determination.

  Hereinafter, a measuring instrument according to an embodiment of the present invention will be described in more detail with reference to the drawings. In this embodiment, the measuring instrument according to the present invention is embodied as an insulation resistance meter.

  FIG. 1 is a schematic functional block diagram of an insulation resistance meter according to one embodiment of the present invention. FIG. 2 is a front view of the insulation resistance meter according to the present embodiment.

  The insulation resistance meter 1 has a measuring device main body 10. The measuring device main body 1 is provided with a control unit 11 serving as a CPU that controls each component of the insulation resistance meter 1 in an integrated manner. A storage unit 12, a measurement unit 13, a display unit 16, an operation unit 17, and the like provided in the measuring instrument main body 10 are connected to the control unit 11. The control unit 11 controls each component of the insulation resistance meter 1 according to a program and data stored in a storage unit 12 that is an EEPROM (electrically erasable / writable ROM).

  The measurement unit 13 that measures a predetermined measurement purpose (parameter) of a measurement target (electrical device to be measured, circuit to be measured) D generates a measurement voltage that applies a predetermined rated measurement voltage to a measurement location of the measurement target D A current detection unit that detects a current flowing through the measurement object D when a rated measurement voltage is applied, a voltage that is applied by the measurement voltage generation unit when a rated measurement voltage is applied, and a current that is detected by the current detection unit. And an A / D converter that converts the data into digital data at a sampling interval (for example, 2 times / second). The control unit 11 calculates an insulation resistance value of the measurement target D based on voltage data and current data from the A / D conversion unit of the measurement unit 13 and performs an insulation resistance determination process described later.

  The measuring device main body 10 is provided with a pair of measuring terminals 15 (151 and 152). One measurement terminal is a ground side measurement terminal 151, and the ground side test lead 141 which is one of the pair of test leads 14 (141, 142) is detachably connected. The other measurement terminal is a line side measurement terminal 152, and a line side test lead 142 which is the other test lead is detachably connected. The earth side measurement terminal 151 is connected to the earth side of the measuring object D through the earth side test lead 141. The line side measurement terminal 152 is connected to a predetermined part of the measurement object D via the line side test lead 142. The pair of test leads 14 are connected to the measurement unit 13 via the pair of measurement terminals 15.

  Note that various types of test leads 14 can be used as the test leads 14 which are probes drawn out from the measuring instrument main body 10 through lead wires. For example, as the ground-side test lead 141, a well-known scissor-shaped alligator-type test lead may be used in addition to the well-known rod-shaped pin-type test lead as schematically shown in FIG. For example, the line side test lead 142 may be provided with a measurement switch that performs the same function as the measurement switch of the operation unit 17 of the measuring instrument main body 10 to be described later. Further, the test lead 14 may not be detachable from the measuring device main body 10.

  A display unit 16 for displaying information is provided on one side surface of the measuring instrument main body 10. In this embodiment, the display unit 16 is a liquid crystal display panel as a digital display.

  The operation unit 17 includes a measurement switch 171, a function switch 172, a comparator button 173, and a backlight lighting button 174 for the display unit 16. The function switch 172 is a rotary switch, and includes a resistance measurement / continuity check range [Ω], [OFF] range, an AC voltage measurement [ACV] range, and a rated measurement voltage setting range as its switching stage. In this embodiment, the rated measurement voltage setting range can be selected from 125 V, 250 V, 500 V, and 1000 V, and any one of 125 V, 250 V, 500 V, and 1000 V from the measurement voltage generation unit of the measurement unit 13 according to this switching. Is applied to the measuring object D.

  The storage unit 12 is provided with a reference value table, in which a plurality of reference values are written for each rated measurement voltage. Each time the comparator button 173 is pressed, the reference values are read one by one from the reference value table and used to determine the insulation resistance of the measuring object D.

  In this embodiment, the insulation resistance meter 1 has a neck belt 20 (FIG. 3) associated with the measuring device main body 10 so that the measuring device main body 10 can be held on the front side of the measurer P. In particular, in this embodiment, a pair of belt engaging portions for connecting the neck belt 20 to the measuring device main body 10 on two opposing side surfaces (left and right side surfaces in FIG. 2) of the measuring device main body 10 are used as a pair. Belt loops 19 (191, 192) are provided. The measuring instrument body 10 is placed on the abdomen or chest of the measurer P by the neck belt 20 (FIG. 3).

  The neck belt 20 is not limited to being directly connected to the measuring device main body 10. For example, the neck belt 20 is connected to a case configured to allow the measuring device main body 10 to be used for measurement in a state in which the measuring device main body 10 is accommodated, so that the measuring device main body 10 and the neck accommodated in the case are connected. A hanging belt 20 may be associated.

  And the insulation resistance meter 1 has the light 18 as an irradiation means provided in the measuring device main body 10. The light 18 is attached to the measuring instrument main body 10 so that the measuring instrument main body 10 irradiates the front of the measuring person with the display unit 16 facing upward and being held on the front side of the measuring person facing the measurement location. Is provided. Further, the control unit 11 can switch the light irradiation state by the light 18 according to the measurement result performed using the test lead 14. In the present embodiment, the control unit 11 switches the color of the light irradiated by the light 18 in correspondence with each of at least two preset sections indicating the measurement results. In particular, in this embodiment, the control unit 11 switches the irradiation state of the light 18 according to whether or not the measurement value satisfies a predetermined condition set in advance as a measurement result. In this case, the measurement result that satisfies the predetermined condition and the measurement result that does not satisfy the predetermined condition are two preset categories indicating the measurement result. More specifically, in the present embodiment, the control unit 11 determines whether the measurement value (insulation resistance value) of the insulation resistance is less than a predetermined threshold value (reference value) set in advance as the measurement result (determination result). The light irradiation state by the light 18 is switched according to whether it is equal to or greater than the threshold value (reference value).

  More specifically, when performing the insulation resistance determination of the measurement object D using the insulation resistance meter 1, the measurer can read the display content of the display unit 16 provided on one side surface of the measuring instrument body 10. The front side (side surface on which the display unit 16 is provided) 10a of the measuring instrument body 10 is directed upward, the lower side in FIG. 2 is directed toward the measurer, and the upper side in FIG. 2 is away from the measurer (measurement). Hold it toward the front of the person (regular measurement posture).

  At this time, when the neck belt 20 is used, the measuring device main body 10 can be measured without holding the measuring device main body 10 by putting the neck belt 20 adjusted to an appropriate length on the neck. It is placed and held on the front side of the person, more specifically on the abdomen or chest of the person to be measured. Accordingly, the measurer can operate the test lead 14 with both hands. For example, by using the line-side test lead 142 with the measurement switch, the measurer does not depend on the operation unit 17 on the measuring instrument main body 10. Then, operations such as start / stop of measurement can be performed.

  Further, instead of or in addition to the use of the neck belt 20, the measurer can hold the measurement device main body 10 on the front side of the measurement operator by grasping the left side of the measurement device main body 10 in FIG. it can. In this case, for example, by using the alligator-type ground-side test lead 141, for example, the line-side test lead 142 is operated with the right hand not holding the measuring device main body 10, and the measuring switch of the measuring device main body 10 with the left hand By operating 171, operations such as start / stop of measurement can be performed. Of course, the line side test lead 142 with the measurement switch may also be used in this case.

  And when a measurement person faces the measurement location of the measurement object D, there exists a measurement location of the measurement object D ahead of the measurement person who hold | maintained the measuring device main body 10 as mentioned above. Therefore, in this state, the light 18 provided so as to irradiate the measuring instrument main body 10 held by the measuring person in front of the measuring person can irradiate the measurement point of the measuring object D or its vicinity. .

  In the present embodiment, the light 18 can emit light of at least two colors of green and red (or orange). And the control part 11 irradiates green light from the light 18 so that it may represent in the preset acceptable range, when the measured insulation resistance value is more than a reference value. On the other hand, when the measured insulation resistance value is less than the reference value, the control unit 12 emits red (or orange) light from the light 18 so as to indicate that it is outside the preset acceptable range. Let

  As a result, the measurer can operate the test lead 14 and look at the measurement point of the measurement target D illuminated by the light 18 or the color in the vicinity thereof without having to look away from the measurement point of the measurement target D. The determination result of the insulation resistance can be known. In addition, even in a noisy environment, it is possible to visually know the determination result of the insulation resistance.

  The light 18 is lit only for a certain period after the measurement value is stabilized, or is lit only for a certain period or until the hold is released when the measurement value is held by a switch operation. be able to.

  The irradiation intensity (light quantity) and irradiation range of the light 18 are measured on the front side of the measurer, more specifically on the abdomen or chest of the measurer, with the display unit 16 provided on one side of the measuring instrument body 10 facing upward. In a state where it is arranged and held, it can be appropriately set so that a measurement location in front of the measurer and a predetermined range in the vicinity of the measurement location separated from the measuring instrument main body 10 can be irradiated with sufficient brightness. Here, “in front of the measurer” may be the measurement location side of the measurement object D facing the measurer rather than the measurer. Further, the “predetermined range at or near the measurement location” may be a range in which the measurer can visually recognize the device without removing the line of sight from the measurement location. The distance from the measuring instrument body 10 to the measurement location of the measuring object D is such that the measurer holding the measuring instrument body 10 can apply the test lead 14 to the measurement location (for example, 0.5 m to 1 m). ).

  Here, in general, an operation of determining an insulation resistance by an insulation resistance meter is often performed indoors, particularly in a dim measurement environment. Therefore, the range in which the measurer can visually recognize the irradiation state of the light 18 without removing the line of sight from the measurement location while performing the operation of applying the contact end of the test lead 14 to the measurement location separated from the measuring device main body 10 is compared. Wide. As an example, in a dim measurement environment, a radius of 0.25 m to 0.5 m centering on a measurement point D of the measurement object D that is 0.5 m to 1 m away from the measuring device main body 10 that is placed and held on the abdomen of the measurer. Good results can be obtained by irradiating the area so that an appropriate illuminance difference from the surroundings can be obtained to the extent that it can be recognized that it has been illuminated. A person skilled in the art can preset the irradiation intensity and irradiation range of the light 18 according to the assumed measurement environment, the color of the irradiation light, and the like as normal design matters.

  As a light source of the light 18, for example, an LED, a laser, or an incandescent lamp can be used. As in the present embodiment, when a plurality of colors of light can be switched and irradiated from the light 18, an LED is preferable because a small size and sufficiently high brightness can be obtained. On the other hand, when a laser is used, it is possible to irradiate a relatively narrow range close to the measurement location with a pinpoint. Moreover, when an incandescent lamp is used, it becomes easy to irradiate over a relatively wide range. In order to provide directivity for appropriately irradiating a predetermined range in front of the measurer, the light 18 may include an optical component such as a light shielding unit or a lens in addition to the light source. For example, a light source element in which a light emitting unit and a case serving as a lens are integrally formed, such as a bullet-type LED, can be suitably used.

  In this embodiment, as shown in FIG. 2, a light 18 having a high-intensity color LED as a light source is arranged in the vicinity of the front edge (upper side in FIG. 2) of the front side 10a of the measuring instrument body 10.

  It should be noted that, for example, green light that implies safety when the measured value, such as insulation resistance, is within the acceptable range, as in this embodiment, and dangerous when outside the acceptable range. By irradiating red (or orange) light implying, there is an advantage that the quality of the determination result can be intuitively determined from the color of the irradiation light. However, the present invention is not limited to this, and any irradiation state can be switched as long as the measurement result can be notified to the measurer. For example, the control unit 11 can switch the presence / absence of lighting of the light 18, the presence / absence of blinking, or the blinking interval corresponding to each of at least two preset segments indicating the measurement results. When switching the presence or absence of lighting, for example, it can be lit only when the measured value is outside the acceptable range. In addition, when switching between flashing and non-flashing, it is possible to always light for a certain period when the measured value is within the acceptable range, and to blink within the period when the measured value is outside the acceptable range. When the blinking interval is switched, the blinking interval can be lengthened when the measured value is within the acceptable range, and the blinking interval can be shortened when the measured value is outside the acceptable range. In these cases, the light 18 may be white light or colored light.

  Next, an example of a measurement procedure when performing insulation resistance determination using the insulation resistance meter 1 of the present embodiment will be described. First, a desired rated measurement voltage is selected with the function switch 172. To use the comparator function, after selecting the rated measurement voltage with the function switch 172, the comparator button 173 is pressed, the reference values are sequentially read from the reference value table, and the desired reference values are displayed on the display unit 16. (Not shown), the reference value is selected. Thereafter, the ground side and the predetermined part of the measuring object D are connected to the ground side measurement terminal 151 and the line side measurement terminal 152 via the ground side test lead 141 and the line side test lead 142, respectively. Next, the measurement switch provided on the measurement switch 171 or the line-side test lead 142 is turned on. Thereby, the insulation resistance value of the measuring object D is displayed on the display unit 17. At the same time, the control unit 11 determines the magnitude relationship between the measured insulation resistance value and the selected reference value. If the measured value <the reference value, red light is emitted from the light 18 and the measurement is performed. When value ≧ reference value, green light is emitted from the light 18.

  In this embodiment, as the case where the light irradiation state by the light 18 is switched according to the measurement result, whether or not the measurement value satisfies a predetermined condition, more specifically, a predetermined threshold value in which the measurement value is set in advance. The case of switching according to whether it is less than or more than the threshold value has been described. However, the present invention is not limited to this, and the control unit 11 may switch the light irradiation state by the light 18 according to the state of the measuring instrument 1. For example, as the state of the measuring instrument 1, the control unit 11 determines whether the measurement is being performed, whether the measured value is confirmed, whether an error or warning event has occurred, or whether the measuring instrument 1 is abnormal. The light irradiation state by the light 18 can be switched depending on whether or not there is. The error or warning event includes, but is not limited to, a hot line warning. Further, the abnormality of the measuring instrument 1 is not limited to this, but includes the presence of a failure found by self-diagnosis of the measuring instrument 1 and a decrease in battery capacity. When notifying the state of the measuring instrument 1, the color of the light irradiated by the light 18 is switched, whether the light 18 is lit, whether the light 18 is lit, whether it is blinking, or the blinking interval. Thus, the light irradiation state by the light 18 can be switched.

  As an example, when switching depending on whether or not measurement is in progress, for example, red light can be emitted during measurement, and green light can be emitted when the measurement is completed (measurement value is held). As a result, the measurer concentrates on the operation of the test lead 14 during the measurement, and only needs to move his / her line of sight to the display unit 16 of the measuring instrument main body 10 when the measurement is completed. Similarly, when switching depending on whether or not the measurement value is confirmed, for example, red light can be emitted until the measurement value is confirmed, and green light can be emitted when the measurement value is confirmed (holding the measurement value). In addition, when switching according to whether an error or warning event has occurred or whether the measuring instrument is abnormal, for example, only when an error or warning event has occurred or when the measuring instrument is abnormal It is possible to irradiate light of a specific color (for example, red or orange), or irradiate light that blinks at a particularly short interval.

  In addition, the irradiation state of the light by the light 18 can be arbitrarily combined with, for example, any of the above-mentioned irradiation states other than those exemplified above, and can be arbitrarily combined with a plurality of other distinguishable irradiation states. Can be used.

  As described above, according to the present embodiment, light is emitted toward the outside of the measuring instrument main body 10 (in the direction opposite to the measuring instrument) toward the front of the measuring instrument, and the measuring instrument is located at a place other than the measuring instrument main body 10. The measurement result or the state of the measuring device is displayed according to the state of the emitted light at a location (the measurement location or the vicinity of the measurement location) where the notification result can be known without removing the line of sight from the measurement location. Therefore, the measurer can check the measurement result or the state of the measuring instrument without looking at the display unit 16 of the measuring instrument main body 10 even in a noisy environment that prevents notification by the buzzer, for example. Since the information is notified in the state of the light irradiated to places other than the measuring instrument main body 10, the measurer can easily and instantaneously measure the measurement result or the measuring instrument by changing the light irradiation state of the relatively large area. You can know the state. Thereby, it is possible to facilitate the measurement work by preventing the test lead from coming off the measurement location. Therefore, according to the present embodiment, the measurement result or the state of the measuring instrument can be obtained without the need for the measurer to remove the line of sight from the measuring spot while performing the operation of applying the contact end of the test lead to the measuring spot spaced from the measuring instrument body 10. It can be easily recognized.

DESCRIPTION OF SYMBOLS 1 Measuring device 10 Measuring device main body 11 Control part 14 Test lead 16 Display part 18 Light (irradiation means)

Claims (8)

In a measuring instrument having a measuring instrument main body, a display unit for displaying information provided on one side of the measuring instrument main body, and a test lead connected to the measuring instrument main body,
Irradiation means provided on the measuring device main body for irradiating the front of the measurer with the display unit facing upward and held on the front side of the measurer,
A control unit provided in the measuring instrument main body for switching the irradiation state of the light by the irradiation means according to the measurement result performed using the test lead or the state of the measuring instrument;
A measuring instrument comprising:   The measuring instrument main body has a neck belt associated with the measuring instrument main body so that the measuring instrument main body can be held on the front side of the measurer, and the measuring instrument main body is arranged on the abdomen or chest of the measurer by the neck strap. The measuring instrument according to claim 1.   The measuring device according to claim 1, wherein the measurement result is whether or not the measurement value satisfies a predetermined condition set in advance.   The measuring device according to claim 3, wherein the measurement result is whether the measurement value is less than or equal to a predetermined threshold value set in advance.   The state of the measuring device is whether it is measuring, whether the measured value is confirmed, whether an error or warning event has occurred, or whether the measuring device is abnormal. The measuring device according to any one of claims 1 to 4, wherein the measuring device is provided.   The control unit switches the color of light emitted by the irradiation unit corresponding to each of at least two preset sections indicating the measurement result or the state of the measuring instrument. A measuring instrument given in any 1 paragraph of -5.   The control unit switches between the presence / absence of lighting of the irradiation unit, the presence / absence of blinking, or the blinking interval corresponding to each of at least two preset categories indicating the measurement result or the state of the measuring instrument. The measuring instrument according to any one of claims 1 to 6, characterized in that:   The measuring device according to claim 1, wherein the irradiation unit includes an LED, a laser, or an incandescent lamp as a light source.

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