JP2014044105A - Resistance measuring device and resistance measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To report a comparison result between the value of resistance value data and a predetermined comparison value in a short time.SOLUTION: A resistance measuring device includes a measurement processing part (a measuring part 2 and a processing part 6) executing first processing for measuring a resistance value on a measuring object X, to generate resistance value data Dc and display the value of the resistance value data Dc on a display part 4 and second processing for comparing the value of the resistance value data Dc with a first comparison value and reporting the comparison result, when a predetermined start condition is satisfied. The measurement processing part executes the second processing by using the resistance value data Dc generated within a second time shorter than a first time, prior to the execution of the first processing by using the resistance value data Dc generated every predetermined first time and does not display that it is defective, when the value of the resistance value data Dc is less than the first comparison value, but displays that the measuring object X is good, when the value of the resistance value data Dc is the first comparison value or more, in the second processing.

Description

  The present invention generates electrical resistance value data by measuring an electrical parameter of a measurement object, and at the same time, first processing for displaying the resistance value data value on the display unit, and the resistance value data value are defined in advance. The present invention relates to a resistance measuring apparatus and a resistance measuring method for executing a second process of comparing a comparison value and reporting a comparison result.

  As this type of resistance measuring apparatus and resistance measuring method, the applicant has disclosed an insulation resistance meter and a method for measuring an insulation resistance value using the insulation resistance meter in Japanese Patent Application Laid-Open No. 2000-214194. When measuring the insulation resistance value with this insulation resistance meter, first, the measurement lever for instructing the start of measurement is turned on in a state where the pair of probes are in contact with the electric device to be measured (measurement object). At this time, a rated measurement voltage is applied from the measurement voltage generator to the electrical device to be measured, and the current flowing through the electrical device to be measured is detected by the current detector in that state. In addition, the applied voltage and the detected current are converted into digital data by the A / D converter, respectively, and the insulation resistance value of the electrical device to be measured by the CPU based on the voltage data and current data output from the A / D converter. Is calculated. Thereby, the calculation result (insulation resistance value) of CPU is displayed on the measured value display area of a display part.

  In addition, this insulation resistance meter is configured to be able to notify a comparison result by comparing a measured value measured in accordance with the same procedure as the above measurement process and a predetermined reference value. Specifically, when the comparator button is operated, the CPU displays a mark “COMP” for notifying that the comparator process (comparison process) is being performed on the display unit, and also from the storage means. The value is read out and displayed in the reference value display area. Next, the measurement lever is turned on. At this time, the insulation resistance value of the electric device to be measured is measured according to the same procedure as the above measurement process, and the magnitude relationship between the measured value and the reference value is compared. In this case, when the measured value is greater than or equal to the reference value (when the measured insulation resistance value is greater than or equal to the reference insulation resistance value), a mark “Hi” is displayed in the LoHi display area of the display unit. On the other hand, when the reference value is larger than the measured value (when the measured insulation resistance value is smaller than the reference insulation resistance value), a mark “Lo” is displayed in the LoHi display area, The buzzer sounds. Thereby, an operator can be made to recognize whether the to-be-measured electric equipment is a desired insulation state.

JP 2000-214194 A (page 3-5, FIG. 1-5)

  However, the insulation resistance meter and the resistance measurement method disclosed by the applicant have the following problems to be improved. In other words, in the insulation resistance meter and the resistance measurement method disclosed by the applicant, the insulation resistance value measured according to the same procedure as the measurement process for measuring the insulation resistance value of the electrical device under measurement during the comparator process (measurement) Value) and the reference value. In this case, in order to accurately measure the insulation resistance value of the electrical device under measurement in this type of insulation resistance meter, the influence of fluctuations in the rated measurement voltage applied to the electrical device under measurement, fluctuations in the measured current, etc. In order to eliminate this, it is necessary to execute various processes. For this reason, it takes a certain amount of time from the start of processing until the voltage data and current data, which are the basis of the measured values to be compared, are output from the A / D converter. Therefore, even if you just want to know if the electrical device under test is in the desired insulation state, it takes a long time to notify the result of the comparator process (judgment result), which improves this point. It is preferable to do this.

  The present invention has been made in view of the problems to be improved, and provides a resistance measuring device and a resistance measuring method capable of notifying a comparison result between a value of resistance value data and a predetermined comparison value in a short time. The main purpose is to do.

  In order to achieve the above object, the resistance measuring apparatus according to claim 1 generates resistance value data by measuring a resistance value as a physical quantity for a measurement target when a predetermined start condition is satisfied. A first process for displaying the value of the resistance value data on a display unit, and a measurement process for executing a second process for comparing the value of the resistance value data with the first comparison value and notifying the comparison result The measurement processing unit includes a first measurement unit that executes the first process using the resistance value data generated every predetermined first time. The second processing is executed using the resistance value data generated within a second time shorter than the first time, and in the second processing, the value of the resistance value data is less than the first comparison value. In the case of When the value of the value data is equal to or greater than the first comparative value, to displays that the measurement target is good.

  The resistance measuring device according to claim 2 is the resistance measuring device according to claim 1, wherein the measurement processing unit includes the value of the resistance value data displayed on the display unit in the first processing and the first value. A comparison is made with a second comparison value defined as a value smaller than the comparison value of 1, and when the value of the resistance value data is equal to or greater than the second comparison value, the fact that the measurement object is good is notified. When the value of the resistance value data is less than the second comparison value, a third process for notifying that the measurement target is defective is executed after the first process.

  Further, the resistance measuring device according to claim 3 is the resistance measuring device according to claim 2, wherein the measurement processing unit completes charging of the capacity of the measurement object prior to execution of the third processing. A charge state determination process for determining whether or not charging is performed, and when it is determined that charging for the capacity is not completed in the charge state determination process, the charge state determination process is performed without executing the third process. When it is determined that the charging for the capacity is completed, the third process is executed.

  The resistance measuring device according to claim 4 is the resistance measuring device according to claim 3, wherein the measurement processing unit generates the Nth (N is 2) generated at the first time in the charging state determination processing. The value of the resistance value data of the above natural number) is compared with the value of the (N−1) th resistance value data generated every first time, and the value of the Nth resistance value data is A first condition that is less than a value of the (N−1) th resistance value data, and a value of the Nth resistance value data relative to a value of the (N−1) th resistance value data. When at least one of the second conditions of the second condition that causes the increase rate to be equal to or less than the predetermined rate is satisfied, it is determined that charging for the capacity is complete, and the at least one condition is When it does not meet, Determines that the charging that has not been completed.

  Further, the resistance measuring device according to claim 5 is the resistance measuring device according to claim 3 or 4, wherein the measurement processing unit sets a predetermined time when the charging to the capacity is not completed in the charging state determination processing. When it determines with having continued, the said charge condition determination process is complete | finished and the said 3rd process is performed.

  Moreover, the measurement apparatus according to claim 6 is the resistance measurement apparatus according to any one of claims 1 to 5, wherein the measurement processing unit compares the resistance with the first comparison value during the second process. Without displaying the value data value on the display unit, the resistance value data value is not displayed until the resistance value data value is displayed by the first processing.

  According to a seventh aspect of the present invention, there is provided the resistance measurement method, wherein when a predetermined start condition is satisfied, a resistance value as a physical quantity for the measurement target is measured to generate resistance value data, and the resistance value data A resistance measurement method for executing a first process for displaying a value of the first value on a display unit and a second process for comparing the value of the resistance value data with a first comparison value and notifying a comparison result, Prior to the execution of the first process using the resistance value data generated every predetermined first time, the resistance value data generated within a second time shorter than the first time. In the second process, when the value of the resistance value data is less than the first comparison value, the fact that the resistance value data is not displayed is displayed. When the value is greater than or equal to the first comparison value, A constant target for the display of that is good.

  According to the resistance measuring apparatus according to claim 1 and the resistance measuring method according to claim 7, the resistance value data generated every predetermined first time is used to display the value on the display unit. Prior to the execution of the process, the second process of notifying the comparison result by comparing the value with the first comparison value using the resistance value data generated within the second time shorter than the first time. Before starting the first process that requires a long measurement time to display an accurate resistance value, the resistance value data generated within a sufficiently short measurement time and the first comparison value Since the comparison result is displayed on the display unit in a short time, the comparison result can be recognized in a short time. In this case, for example, when the measurement target is a capacitive load having a capacity, even if the measurement target itself is a non-defective product, the resistance value of the measurement target can be accurately measured until the capacity is charged. There are things you can't do. Therefore, according to the resistance measuring apparatus and the resistance measuring method, in the second process, when the resistance data value is less than the first comparison value, the fact that the defect is not displayed is displayed, so that the measurement time is short. As a result, it is possible to avoid an erroneous comparison result in which a non-defective measurement target is determined to be defective from being displayed on the display unit, so that the operator can recognize an accurate comparison result.

  According to the resistance measuring apparatus of the second aspect, the third process for comparing the resistance value data displayed on the display unit in the first process with the second comparison value and notifying the comparison result. Is executed after the first processing, the operator can recognize an accurate comparison result using accurate resistance value data measured within a sufficiently long measurement time.

  According to the resistance measuring device of claim 3, the measurement processing unit determines whether or not the charging for the capacity of the measurement target is completed in the charging state determination process, and completes the charging for the capacity. If the measurement object is a capacitive load and the capacity is large, it is possible to determine the failure due to the incomplete charging of the capacity. As a result, it is possible to avoid making an accurate determination.

  According to the resistance measuring device of the fourth aspect, the value of the Nth resistance value data generated every first time and the value of the (N−1) th resistance value data generated every first time. By comparing the value, it can be reliably determined whether or not charging is completed for the capacity of the measurement target.

  Furthermore, according to the resistance measuring device of claim 5, when the measurement processing unit determines that the state in which charging for the capacity of the measurement target in the charging state determination process is not completed continues for a predetermined time, the charging state By terminating the determination process and executing the third process, a situation in which the comparison result is not displayed for a long time can be avoided.

  According to the resistance measuring apparatus of the sixth aspect, the value of the resistance value data by the first process without displaying the value of the resistance value data compared with the first comparison value at the time of the second process on the display unit. By maintaining the non-display state of the resistance value value until the value is displayed, the resistance value value that may be inaccurate due to the short measurement time is displayed on the display unit and is inaccurate. It is possible to suitably avoid a situation where a correct value is recognized by the operator.

1 is a configuration diagram of an insulation resistance meter 1. FIG. It is a flowchart of the insulation resistance measurement process 10 performed in the insulation resistance meter 1. FIG. 10 is a flowchart of a comparison process A20 in the insulation resistance measurement process 10. 12 is a flowchart of a comparison process B30 in the insulation resistance measurement process 10.

  Hereinafter, embodiments of a resistance measuring device and a resistance measuring method will be described with reference to the accompanying drawings.

  The insulation resistance meter 1 shown in FIG. 1 is an example of a “resistance measurement device”, and is configured to be able to measure an insulation resistance value between any two points in the measurement target X. Specifically, the insulation resistance meter 1 includes a measurement unit 2, an operation unit 3, a display unit 4, a storage unit 5, and a processing unit 6. The measurement unit 2 and the processing unit 6 constitute a “measurement processing unit”. The measurement unit 2 includes a measurement voltage generator (not shown) that applies a measurement voltage to the measurement target X via the contact probes 2a and 2b, a measurement voltage that is applied to the measurement target X, and the measurement target X. And an A / D converter (not shown) that outputs measurement data Da (voltage value data) and measurement data Db (current value data).

  The operation unit 3 includes a measurement start / stop switch (not shown) and various operation switches for setting operation conditions (measurement conditions) of the insulation resistance meter 1, and outputs an operation signal according to the switch operation. The display part 4 is comprised by the liquid crystal display which has an LED backlight as an example, and displays a measurement result and the result of the comparison process mentioned later according to control of the process part 6. FIG. Although an example of a “resistance measuring device” having a display unit 4 will be described, a configuration in which measurement results and the like are displayed on a “display unit” as an external device without using a “display unit” may be adopted. it can. The storage unit 5 includes determination values Ra and Rb (an example of “first comparison value” and “second comparison value”) used by the processing unit 6 in comparison processing described later, an operation program for the processing unit 6, and processing The resistance value data Dc calculated by the unit 6 is stored.

  The processing unit 6 controls the insulation resistance meter 1 as a whole. Specifically, the processing unit 6 controls the measurement unit 2 when the measurement start / stop switch of the operation unit 3 is operated (an example of “when a predetermined start condition is satisfied”). Then, application of the measurement voltage to the measurement object X and generation of the measurement data Da and Db are started. Further, the processing unit 6 calculates an insulation resistance value between the two points where the contact probes 2a and 2b are in contact with each other on the measurement target X based on the measurement data Da and Db output from the measurement unit 2, and calculates the resistance value. Data Dc (an example of “resistance value data”) is generated (steps 13 and 15 in an insulation resistance measurement process 10 to be described later: see FIG. 2), and the generated resistance value data Dc is stored in the storage unit 5.

  Further, the processing unit 6 performs a measurement result display process (an example of “first process”: step 16 in the insulation resistance measurement process 10) that causes the display unit 4 to display the value of the generated resistance value data Dc as a numerical value or a graph. Run. Further, the processing unit 6 compares the generated resistance value data Dc with the determination value Ra stored in the storage unit 5, and the measurement target X is good on the display unit 4 according to the comparison result. A comparison result notification process (an example of “second process”: comparison process A20 in the insulation resistance measurement process 10: see FIG. 3) for notifying the comparison result by displaying a certain fact is executed, and the generated resistance value data Comparison is made by comparing the value of Dc and the determination value Rb stored in the storage unit 5 and displaying that the measurement object X is good or bad on the display unit 4 according to the comparison result. A comparison result notification process for notifying the result (an example of “third process”: comparison process B30 in the insulation resistance measurement process 10: see FIG. 4) is executed.

  In using the insulation resistance meter 1, first, the contact probes 2a and 2b are brought into contact with arbitrary points on the measurement objects X and X, respectively, and a power switch (not shown) is turned on. At this time, the processing unit 6 starts the insulation resistance measurement processing 10 shown in FIG. 2 according to the operation program stored in the storage unit 5. In this insulation resistance measurement process 10, the processing unit 6 first starts monitoring whether or not the measurement start / stop switch of the operation unit 3 has been operated (step 11).

  Further, when the processing unit 6 determines that the measurement start / stop switch is operated based on the operation signal from the operation unit 3, the processing unit 6 controls the measurement unit 2 to start applying the measurement voltage to the measurement target X. The time (hereinafter also referred to as “measurement time”) from when the measurement data Da and Db are output to the time Ta (an example of “second time”: for example, 10 ms) is set to the measurement data Da. , Db generation processing is started (step 12). At this time, the measurement unit 2 starts applying the measurement voltage to the measurement target X via the contact probes 2a and 2b according to the control of the processing unit 6, and applies the measurement voltage being applied and the measurement voltage. The current flowing between the measurement objects X and X is detected while the voltage is applied to generate measurement data Da and Db, and the generated measurement data Da and Db are output to the processing unit 6.

  In this case, in this type of “measuring device”, when the measurement target X is a capacitive load having a capacity, the voltage value is set to a desired voltage value (rated rating) after application of the measurement voltage is started. It takes a certain amount of time to reach the voltage value) because the capacity needs to be charged. Therefore, in this insulation resistance meter 1, as an example, at the time when the voltage value of the measurement voltage rises to some extent after a time of about several tens of milliseconds has elapsed since the start of application of the measurement voltage, the A / D conversion unit Adopts a configuration in which generation of measurement data Da and Db is started. Further, the A / D conversion unit performs a plurality of sampling processes within the above “measurement time” set by the processing unit 6 after the voltage value of the measurement voltage reaches a specified voltage value, By performing averaging processing and filtering processing of each sampling value, one measurement data Da and one measurement data Db are generated and output within the set “measurement time”.

  On the other hand, the processing unit 6 calculates an insulation resistance value between two points where the contact probes 2a and 2b are in contact with each other based on the measurement data Da and Db output from the measurement unit 2, and calculates resistance value data Dc (" An example of “resistance value data” is generated (step 13) and stored in the storage unit 5. Next, the processing unit 6 starts the comparison process A20 shown in FIG. In this comparison process A20, the processing unit 6 first determines that the value of the generated resistance value data Dc (the above-described insulation resistance value between the two points) is the determination value Ra (“first first value” stored in the storage unit 5). An example of “comparison value”) is determined (step 21).

  At this time, when the value of the resistance value data Dc is equal to or greater than the determination value Ra (when the determination value Ra is equal to or less than the value of the resistance value data Dc), the processing unit 6 causes the display unit 4 to display PASS determination ( An example of notifying “comparison result that measurement target X is good”, in which comparison result (determination result) is notified by displaying PASS determination on display unit 4: step 22). As a result, the operator who has visually recognized the screen on which the PASS judgment is displayed indicates that the two points contacting the contact probes 2a and 2b are well insulated with an insulation state equal to or greater than the prescribed insulation resistance value. Recognize intuitively.

  On the other hand, when the value of the resistance value data Dc is smaller than the determination value Ra (when the determination value Ra is larger than the value of the resistance value data Dc), at this time, the processing unit 6 determines that the measurement target X is the measurement target X. The comparison process A30 is terminated without displaying the fact that it is defective on the display unit 4. Thereby, for example, when the measurement target X is a capacitive load, when the measurement target X itself is a non-defective product, the comparison that the measurement target X is defective until the capacity is charged. Since it is possible to avoid displaying the result, it is possible to avoid erroneous determination regarding the quality of the measurement target X, and as a result, accurate determination can be performed.

  In this example, the processes in steps 21 and 22 in the comparison process A20 correspond to the “second process”. In this case, the insulation resistance value calculated based on the measurement data Da and Db measured within a short “measurement time” is obtained when the capacitive load is the measurement object X and the voltage value of the measurement voltage or the measurement object. Due to causes such as fluctuations in the current value of the current flowing through X, the value may not be sufficiently accurate. Therefore, in this insulation resistance meter 1, the insulation resistance value calculated in the above step 13 is not displayed on the display unit 4, and the accurate insulation resistance value is obtained in step 16 (see FIG. 2) described later. A configuration is adopted in which the non-display state of the insulation resistance value is maintained until is displayed.

  On the other hand, in order to accurately measure an insulation resistance value and the like, it is necessary to define a “measurement time” sufficiently long so that an inaccurate measurement value is not calculated due to the above-described causes. Therefore, in this insulation resistance meter 1, as described above, in each of the above steps for notifying the insulation state between two points, in order to promptly notify the comparison result (determination result) with “good”. In the subsequent steps for displaying an accurate insulation resistance value, the “measurement time” is set to a relatively short time Ta (10 ms in this example) and the measurement process is executed. Is set to a time Tb longer than the time Ta (for example, 300 ms: an example of “first time”), and the measurement process is executed.

  Specifically, the processing unit 6 notifies the comparison result (determination result) and ends the comparison process A20, and then sets the “measurement time” to a time Tb of 300 ms, and sets the measurement data Da and Db to The generation process is started (step 14). Specifically, the measurement unit 2 applies a measurement voltage between two points of the measurement target X via the contact probes 2a and 2b according to the control of the processing unit 6, and applies the measurement voltage being applied, and The current flowing through the measurement object X is detected in the state where the measurement voltage is applied, and the measurement data Da and Db are generated. The generated measurement data Da and Db are output to the processing unit 6.

  In this case, the sampling process is performed a plurality of times over a sufficiently long time compared to the measurement process that is executed when the comparison result (determination result) is notified, and each sampling value is averaged. Filtering processing or the like is executed, and one piece of measurement data Da and Db is generated and output every 300 ms. Further, the processing unit 6 calculates an insulation resistance value between two points where the contact probes 2a and 2b are in contact with each other based on the measurement data Da and Db output from the measurement unit 2, and calculates resistance value data Dc (" An example of “resistance value data” is generated (step 15) and stored in the storage unit 5. Next, the processing unit 6 controls the display unit 4 to display the value of the generated resistance value data Dc (an example of “first processing”: step 16). Thereby, a sufficiently accurate measurement result is displayed.

  Next, the processing unit 6 starts the comparison process B30 shown in FIG. In this comparison process B30, first, the processing unit 6 first determines the value of the N-th generated resistance value data Dc (insulation resistance value based on the measurement data Da and Db measured within the “measurement time” of 300 ms: “first 1) of the resistance value data displayed on the display unit in the process of (1)) and the (N-1) th value of the resistance value data Dc generated are compared, and the charging of the capacity of the measurement object X is completed. A charge state determination process (step 31) is performed to determine whether there is any. Here, when the measurement target X is a capacitive load and the capacity is large, when the time from the start of measurement is short, the pass / fail judgment is made before the charging of the capacity is completed. A failure determination is made before the charging is completed. Therefore, before performing the pass / fail determination of the measurement target X, it is necessary to perform the above-described charging state determination process (step 31).

  In this case, generally, when the capacitor is charged, the value (insulation resistance value) of the generated resistance value data Dc always increases, so the Nth measurement value is the (N-1) th measurement. Larger than the value. Therefore, the processing unit 6 uses the first condition that the value of the Nth resistance value data Dc is less than the (N−1) th resistance value data Dc and (N− 1) Both of the second conditions in which the increasing rate of the value of the Nth resistance value data Dc with respect to the value of the first resistance value data Dc is equal to or less than a predetermined rate (about several percent as an example). When not satisfying, it determines with the capacity | capacitance of the measuring object X not having completed charge, and complete | finishes the comparison process B30. In this example, the second condition is defined as “the increase rate of the value of the Nth resistance value data Dc with respect to the value of the (N−1) th resistance value data Dc is equal to or less than a predetermined rate”. However, instead of this, “the fluctuation rate of the value of the Nth resistance value data Dc with respect to the value of the (N−1) th resistance value data Dc is equal to or less than a predetermined rate” or “( N-1) The rate of decrease in the value of the Nth resistance value data Dc with respect to the value of the Nth resistance value data Dc may be defined as “a predetermined rate or more that is defined in advance”.

  In addition, the processing unit 6 continues the time defined in advance in a state where the charging of the capacity of the measurement target X is not completed in the charging state determination process (step 31) (hereinafter also referred to as “specified time”. As an example, 5 seconds or the like) ), The charging state determination process (step 31) is terminated, and step 32 to be described later is executed.

  On the other hand, the process part 6 determines with the charge with respect to the capacity | capacitance of the measuring object X having been completed, when at least one of said 1st conditions and 2nd conditions is satisfy | filled.

  Next, when the processing unit 6 determines that the charging of the capacity of the measurement target X is completed, and when it is determined that the state in which the charging is not completed continues for the specified time, the value of the generated resistance value data Dc Is greater than or equal to a determination value Rb (an example of “second comparison value”) stored in the storage unit 5 (step 32). At this time, when the value of the resistance value data Dc is equal to or greater than the determination value Rb (when the determination value Rb is equal to or less than the value of the resistance value data Dc), the processing unit 6 performs PASS determination as an example of notification of the comparison result. Is displayed on the display unit 4 (step 33). As a result, the operator recognizes that the two points where the contact probes 2a and 2b are in contact with each other by visually recognizing the PASS determination display screen are well insulated with an insulation state equal to or greater than the prescribed insulation resistance value. .

  On the other hand, when the value of the resistance value data Dc is smaller than the determination value Rb (when the determination value Rb is larger than the value of the resistance value data Dc), the processing unit 6 is an example of notifying the comparison result. The FAIL judgment is displayed on the display unit 4 (step 34). As a result, the operator visually recognizes the FAIL judgment display screen and recognizes that the insulation state between the two points where the contact probes 2a and 2b are in contact is less than the prescribed insulation resistance value and the insulation state is poor. To do.

  In this case, as described above, the insulation resistance value calculated based on the measurement data Da and Db measured within a short “measurement time” may not be a sufficiently accurate value. Therefore, in this insulation resistance meter 1, a value sufficiently larger than the determination value Rb (preferred value as the insulation resistance value according to the insulation state between the two points) used in the comparison process B30 in the comparison process A20. A configuration is adopted in which the insulation state between two points is determined by comparing the determination value Ra defined in (as an example, a value that is about two to five times larger than the determination value Rb) and the resistance value data Dc. Has been. As a result, even if it is measured that the insulation resistance value between two points whose insulation state is not good due to the short “measurement time” is larger than the actual insulation resistance value, it is sufficient. By notifying the comparison result with the determination value Ra defined as a large value, it is possible to avoid a situation where the insulation state is erroneously notified.

  On the other hand, in the comparison process B30, since the insulation resistance value calculated based on the accurate measurement data Da and Db measured within a sufficiently long “measurement time” is used as a comparison object, the determination as a reference for comparison is performed. The value Rb is defined as a preferable value (a value capable of accurately comparing (determining whether or not the insulation state is good) as an insulation resistance value according to the insulation state between the two points. Thereby, although the insulation state is good, a situation in which it is erroneously notified that the insulation state is not good by being compared with the determination value defined as an excessively large value is avoided. In this example, steps 32 and 33 or steps 32 and 34 in the comparison process B30 correspond to the “third process”.

  Subsequently, the processing unit 6 ends the condition (for example, when the measurement end is instructed by operating the measurement start / stop switch or when the insulation resistance value is measured for a preset time). Whether or not is satisfied is determined (step 17). At this time, if it is determined that the termination condition is not satisfied, the processing unit 6 returns to step 15 to calculate the insulation resistance value based on the measurement data Da and Db (step 15), and the calculated insulation resistance. The value display (step 16: “first process”) and the comparison process B30 (“third process”) are executed in this order, and it is determined again whether the end condition is satisfied (step 17). . In addition, when the end condition is satisfied (for example, when the measurement start / stop switch is operated), the processing unit 6 ends the insulation resistance measurement process 10.

  As described above, according to the insulation resistance meter 1 and the resistance measurement method using the insulation resistance meter 1, the resistance value data generated every predetermined “first time (in this example, time Tb = 300 ms)”. Prior to the execution of the “first process (in this example, step 16 in the above-described insulation resistance measurement process 10)” for displaying the value on the display unit 4 using Dc, the “first time (in this example, 300 ms) ”, and the resistance value data Dc generated within the“ second time (in this example, time Ta = 10 ms) ”is compared with the value determined in advance and the comparison value Ra is compared. By executing the “second process (in this example, the comparison process A20 in the above-described insulation resistance measurement process 10)” that informs (that it is good), a long “ `` Measurement time '' is required The comparison result (determination result) between the resistance value data Dc and the determination value Ra generated within a sufficiently short “measurement time” is displayed on the display unit 4 in a short time before the “first process” is started. The comparison result can be recognized in a short time.

  Further, when the measurement target X is a capacitive load having a capacity, even if the measurement target X itself is a non-defective product, the insulation resistance value of the measurement target X must be accurately measured until the capacity is charged. May not be possible. Therefore, according to the insulation resistance meter 1 and the resistance measurement method using the insulation resistance meter 1, in the second process, when the value of the resistance value data Dc is less than the first comparison value, the failure is not displayed. As a result, it is possible to avoid that an erroneous comparison result in which the non-defective measurement target X is determined to be defective due to the short measurement time is displayed on the display unit 4, and as a result, an accurate comparison result for the operator Can be recognized.

  Further, according to the insulation resistance meter 1 and the resistance measurement method using the insulation resistance meter 1, the value of the resistance value data Dc displayed on the display unit 4 in the “first processing” and the predetermined determination value Rb By executing the “third process (in this example, the comparison process B30 in the above-described insulation resistance measurement process 10)” after the “first process” to notify the comparison result by comparing “ The operator can recognize an accurate comparison result (determination result) using the accurate resistance value data Dc measured within the “measurement time”.

  In addition, according to the insulation resistance meter 1 and the resistance measurement method using the insulation resistance meter 1, the value of the determination value Ra and the resistance value data Dc defined in the “second process” is larger than the determination value Rb. In other words, in the “second process” for comparing with the resistance value data Dc that may be inaccurate due to the short “measurement time”, the state of the measurement target X is In order to avoid different comparison results, a determination value Ra having a margin (margin) is used, and the “third process” is compared with the resistance value data Dc that is sufficiently accurate because the “measurement time” is long. In the “second process” and the “third process”, the determination value Rb having a small margin is used so that the state of the measurement target X can be accurately grasped based on the comparison result. Comparison result( It can be suitably avoided that constant result) is reported.

  Further, according to the insulation resistance meter 1 and the resistance measurement method using the insulation resistance meter 1, in the charge state determination process (step 31), it is determined whether or not the capacity of the measurement target X has been completely charged. By performing the third process when it is determined that the charging for the capacity is completed, even if the measurement target X is a capacitive load and the capacity is large, the charging for the capacity is performed. As a result, it is possible to avoid performing the defect determination due to the incompleteness, so that an accurate determination can be performed.

  Further, according to the insulation resistance meter 1 and the resistance measurement method using the insulation resistance meter 1, the value of the Nth resistance value data Dc generated every time Tb (first time) and the time Tb (first time) ) And the value of the (N-1) th resistance value data Dc generated every time, it is possible to reliably determine whether or not charging is completed for the capacity of the measurement target X. .

  Further, according to the insulation resistance meter 1 and the resistance measurement method using the insulation resistance meter 1, in the charge state determination process (step 31), the state in which charging for the capacity of the measurement target X is not completed continues for the specified time. When the determination is made, the charge state determination process is terminated, and the “third process (in this example, the comparison process B30 in the insulation resistance measurement process 10)” is executed (the value of the resistance value data Dc when the specified time elapses). (Displayed on the display unit 4) can avoid a situation in which the comparison result is not displayed for a long time.

  Further, according to the insulation resistance meter 1 and the resistance measurement method using the insulation resistance meter 1, the value of the resistance value data Dc compared with the determination value Ra at the time of the “second processing” is displayed on the display unit 4 without displaying it. By maintaining the non-display state of the resistance value data Dc until the value of the resistance value data Dc is displayed by the “first processing”, there is a possibility that the “measurement time” is short, resulting in inaccuracy. A situation in which the value of certain resistance value data Dc is displayed on the display unit 4 and an incorrect insulation resistance value is recognized by the operator can be preferably avoided.

  In the above example, as a method of notifying the operator of the result of the pass / fail determination of the measurement target X, a configuration and a method for performing PASS determination display or FAIL determination display on the display unit 4 are employed. It is also possible to employ a configuration and method in which the backlight is turned on and the result of the quality determination is notified to the operator by the color difference.

  In the above example, the measurement of the insulation resistance value between any two points in the measurement objects X and X and the determination of pass / fail are exemplified, but the resistance measurement of the capacitive load alone and the pass / fail determination thereof are performed. You can also.

DESCRIPTION OF SYMBOLS 1 Insulation resistance meter 2 Measuring part 2a, 2b Contact probe 3 Operation part 4 Display part 5 Memory | storage part 6 Processing part 10 Insulation resistance measurement process 20 Comparison process A
30 Comparison process B
Da, Db measurement data Dc Resistance value data Ra, Rb judgment value Ta, Tb Time X Measurement object

Claims (7)

A first process for generating a resistance value data by measuring a resistance value as a physical quantity for a measurement target and displaying a value of the resistance value data on a display unit when a predetermined start condition is satisfied And a resistance measuring device comprising a measurement processing unit that executes a second process of comparing the value of the resistance value data with a first comparison value and notifying a comparison result,
Prior to the execution of the first process using the resistance value data generated every predetermined first time, the measurement processing unit within a second time shorter than the first time. The second process is executed using the generated resistance value data, and in the second process, when the value of the resistance value data is less than the first comparison value, a failure is not displayed. A resistance measurement device that displays that the measurement object is good when the value of the resistance value data is greater than or equal to the first comparison value.   The measurement processing unit is defined to have a value smaller than the first comparison value and the value of the resistance value data displayed on the display unit in the first processing. When the value of the resistance value data is equal to or greater than the second comparison value, the fact that the measurement object is good is notified, and the value of the resistance value data is less than the second comparison value. The resistance measuring device according to claim 1, wherein a third process for notifying that the measurement target is defective is executed after the first process.   Prior to the execution of the third process, the measurement processing unit executes a charge state determination process for determining whether or not charging for the capacity of the measurement target is completed, and the capacity is determined in the charge state determination process. If it is determined that charging for the battery is not completed, the third process is not performed, and if it is determined in the charging state determination process that charging for the capacity is completed, the third process is performed. The resistance measuring device according to claim 2.   The measurement processing unit generates the Nth (N is a natural number greater than or equal to 2) the resistance value data generated every first time in the charging state determination processing and every first time ( A first condition in which the value of the N-1th resistance value data is compared and the value of the Nth resistance value data is less than the value of the (N-1) th resistance value data; and Of the second condition, the rate of increase in the value of the Nth resistance value data is less than or equal to a predetermined rate with respect to the value of the (N-1) th resistance value data. 4. The method according to claim 3, wherein when at least one of the conditions is satisfied, it is determined that charging for the capacity is completed, and when at least one of the conditions is not satisfied, it is determined that charging for the capacity is not completed. Resistance measuring device.   When the measurement processing unit determines that the state in which charging for the capacity is not completed continues for a predetermined time in the charging state determination process, the measurement processing unit ends the charging state determination process and executes the third process The resistance measuring apparatus according to claim 3 or 4.   The measurement processing unit displays the value of the resistance value data by the first process without displaying the value of the resistance value data compared with the first comparison value in the second process on the display unit. The resistance measuring apparatus according to claim 1, wherein the resistance value data is not displayed until the resistance value data is displayed. A first process for generating a resistance value data by measuring a resistance value as a physical quantity for a measurement target and displaying a value of the resistance value data on a display unit when a predetermined start condition is satisfied And a resistance measurement method for executing a second process of comparing the value of the resistance value data with a first comparison value and notifying a comparison result,
Prior to the execution of the first process using the resistance value data generated every predetermined first time, the resistance value data generated within a second time shorter than the first time. In the second process, when the value of the resistance value data is less than the first comparison value, the fact that the resistance value data is not displayed is displayed. A resistance measurement method for displaying that the measurement object is good when the value is equal to or greater than the first comparison value.

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