201017200 九、發明說明： 【發明所屬之技術領域】 尤其涉及一種萬用 本發明涉及一種校驗系統及方法， 表校驗系統及方法。 【先前技術】 ❹ 掌上型萬用表已經被廣泛传用，缺 的準確度的要求也是越來越高。因此型萬用表 確度已經成為了重要的課題。 的％C驗準 =前，由於萬絲沒有對外介面，對萬絲的校 要將萬用表所顯示的數值人工輸人電腦，在校驗萬用表的 不^位時’需要人卫手動_換線，所有的校驗點校驗 元畢後’需要手動記錄資料，製作校驗報告，浪費了大量 的人力，降低了工作效率。 【發明内容】 上内容’有必要提供-種萬用表校驗系統及方 ❿ 法’可以有效地對萬用表進行校驗。 -種萬絲校驗系統’包括校準源及與該校準源連接 的電腦，該校準源與待校驗的萬用表相連，該電腦連接有 攝像頭和機械手臂，該機械手臂用於調整該萬用表所要校 驗的檔位；該校準源用於根據所調整的檔位向萬用表輸出 類比訊號；該萬用表用於將該頬比訊號轉換為數位訊號， 並顯示該數位訊號表達的數值；該攝像頭用於拍攝該萬用 表所顯示的數值得到圖片；及該電腦用於獲取所拍攝圖片 中的數值，判斷所拍攝圖片中的數值的平均值是否在所述 201017200 • 萬用表的允許誤差範圍内，並根據該判斷結果生成校驗報 " 告。 ’ 一種萬用表校驗方法，該方法包括如下步驟：將萬用 表調至需要校驗的檔位；校準源根據所調整的檔位向萬用 表輸出類比訊號；萬用表將該類比訊號轉換為數位訊號， 並顯示該數位訊號表達的數值；拍攝該萬用表所顯示的數 值；獲取所拍攝圖片中的數值；判斷所拍攝的所有圖片中 的數值的平均值是否在萬用表的允許誤差範圍内；及根據 上述判斷結果生成校驗報告。 相較於習知技術，所述萬用表校驗系統及方法，可以 由電腦全程控制萬用表校驗過程，提高了工作效率，節省 了工作時間。 【實施方式】 如圖1所示，係本發明萬用表校驗系統較佳實施例之 硬體架構圖。該系統包括：萬用表1、校準源2、測量控制 φ 箱3、電腦4、攝像頭5及機械手臂6。 所述萬用表1和校準源2均包括多個檔位，該檔位如 交流電壓檔。其中，萬用表1的檔位與校準源2的檔位相 互對應，且對應的檔位透過所述測量控制箱3的一個開關 相連，例如，萬用表1的交流電壓檔透過該測量控制箱3 的一個開關與校準源2的交流電壓檔相連。 校準源2和測量控制箱3分別透過串列埠連接於電腦 4，該串列埠如RS232串列埠。當所述測量控制箱3的開 關閉合時，該測量控制箱3會發送訊號給電腦4，通知該 6 201017200 電腦4所述開關已閉合。電腦4在接收到該訊號後，發送 命令給校準源2，使得該校準源2發送一個類比訊號至萬 用表ί。本實施例中的類比訊號可以為電壓訊號或者電流 訊號。所述萬用表i勒於將該類比訊號轉換成數位訊 號，並顯示該數位訊號所表達的數值。 在本實施例中’所述攝像頭5既可透過usb介面連接 於電腦4 ’也可内置於該電腦4中。該攝像頭 φ Φ 所述萬用表1所顯示的數值，具體而言，該攝像頭5每 〆段時間t拍攝一次’在本較佳 4用於對攝像頭5所拍攝的圖二2 =腦 处奚，ϋ根據兮分政， 灯刀祈仔到一個校驗 驗結果生成校驗報告。另外，兮雷腦4 透過-個串列埠與機械 4 f6調整萬用表！的槽位。連其用於控制該機械手 作業^所示’係本發明萬用表校驗方法較佳實施例之 校驗6將萬用表1的構位調整到所要 步1 22 ’測量控制箱3根據所要校驗的槽位閉合相 應的開例如’於步称S20中，若機械手臂6將萬:表 1的權位^整到交流電壓稽’則測量控制箱3閉人連接萬 用表二3電=校準源2的交流錢槽的_。 Μ號給萬用表^ 合後’所述校準源2發送一個類 ^ § 電4 。在本實施例中，該類比訊號可以為電 靜说或電流訊號。例如，若於步驟S22中閉合了測量控 7 201017200 制箱3連接所述交流電壓檔的開關，則所述類比訊號為電 壓訊號。 步驟S26，所述萬用表i接收到該類比訊號後，將該 類比訊號轉換為數位訊號，並顯示該數位訊號所表達的數 值0 步驟S28’攝像頭5拍攝所述萬用表m顯示的數值。 本實施例中，該攝像頭5每㉟200ms拍攝一次萬用表ί所 顯不的數值’共拍攝十次。 步驟S30,電腦4獲取所拍攝圖片_的數值。 …㈣S32 ’該電腦4判斷所述數值的平均值是否在所 述萬用表1的允許誤絲軸。若所述平均值不在萬用表 1的允許誤差範圍内，則於半 步驟S34提示萬用表1出錯， 即校驗結果為萬用表1翻i 吳差’然後進入步驟S38。其中， 所述平均值是指將攝像頭5拍攝的所有圖 片中的數值進行 ❹ 目加然ί除以圖片的個數所得到的值。例如，若攝 5共拍攝了 10張圖片 一 則所述平均值等於該10張圖片所 顯示的數值之和除以 步驟S36,當所述 欣 疋十均值在所述萬用表1的允許誤差 範圍内時，所述校驗社| 果為萬用表1通過校驗，電腦4判 斷該萬用表1需要校 驗的檔位是否都已經校驗完畢。若所 述萬用表1存在需要於 货校驗的檔位沒有校驗，則轉至步驟 S20。若所述萬用表1 寓要校驗的檔位都已經校驗完畢， 進入步驟S38。 步驟S38 ’電腦4椒 ㈤H根據校驗結果生成校驗報告。 8 201017200 ' 如圖3所示，係電腦4獲取圖片中數值之較佳實施例 的流程圖。 步驟S300’攝像頭5拍攝萬用表χ當前所顯示的數值 作為第-張圖片。如圖4所示’該第—張圖片顯示的是 0.2 ’即萬用表1所顯示的數值為0.2。 步驟S302,校準源2根據電腦4所發送的命令重新輸 出另-個類比訊號給萬用表i，萬用表工將該類比訊號轉 ❹換成數位訊號，並顯示該數位訊號所表達的數值。 步驟S304 ’攝像頭5拍攝萬用表1私本 一 1将雨爪你J於步驟S302中所 顯示的數值，得到第二張圖片。如圖5所 小，該第一張圖 片顯示的是8.21 ’即萬用表1所顯示的數值為8 。 步驟S306’電腦4利用差影法得到一張新圖片°。該差 影法是指將第-張圖片與第二張圖片所顯示的圖像相減， 所得到的結果圖像即為所述新圖片。例如，將圖5與圖4 中的兩張圖片所顯示的圖像相減得到囷6所示的新圖片。 ©在本實施例中，無論是第一張圖片、第二張圖片，還是新 圖片，組成每個數值的字元均由八段組成，即均為八段瑪 字元。 … 步驟S308，電腦4獲取該新圖片中組成每個八段瑪字 元的段的頂點座標。如圖7所示，新圖片中顯示的是八段 碼字元8,本實施例以該八段碼字元8中的μ段的頂點座 標為例進行說明，若以該新圖片中左上角的點〇為原點作 平面坐標系，組成Μ段的矩形ABCD的四個頂點座標為： A ( xl，y2)，B ( x2，y2 ) ’ C ( xl，yl)，d ( χ2，yl)。 9 201017200 步驟S310’利用所獲取的頂點座標在第一張圖片及第 ·>. 二張圖片上尋找該八段碼字元中各段所對應的位置《例如 在圖5中所述的第二張圖片中尋找到該μ段所對應的位 置。 步驟S312’計算八段碼字元中組成各段的所有圖元點 的平均亮度Fi，例如，若以i表示八段碼字元的段，丨取值 為1至8 ’ Μ段可以定義為第一段，即i=i，則F1表示該 鲁M段内所有圖元點的平均亮度。 步驟S314’計算參考區域的亮度平均值Fr。該參考區 域是指圖片中除去所有八段碼字元的區域。 步驟S316，判斷|Fi_Fr|是否大於一個閥值。該閥值可 自行設定’本較佳實施例中該閥值為125階。當所述|Fi-Fr| 大於該閥值時，進入步驟S318;當|Fi-Fr丨不大於該閥值時， 進入步驟S320。 步驟S318，確定該段的狀態為亮態，例如，F1為Μ ® 段的平均亮度’當|F1-Fr|大於所述閥值時，該Μ段被確認 為免態。 步驟S320，確定該段的狀態為暗態。 步驟S322,根據各段的亮暗狀態利用真值表得到各圖 片中的數值，所述真值表如圖8所示。該各圖片包括第一 張圖片和第二張圖片。 在本實施例中，圖8所示的“1”代表亮態，代表暗 需要指出的是，上述步驟中所拍攝的兩張圖片中的數 201017200 值，利用差影法所得到的新圖片中至少要有一個字元為 8 ’以精確的定位母個八段碼字兀。 以上所述僅為本發明之較佳實施例而已，且已達廣泛 之使用功效，凡其他未脫離本發明所揭示之精神下所完成 之均等變化或修飾，均應包含在下述之申請專利範圍内。 【圖式簡單說明】 圖1係本發明萬用表校驗系統較佳實施例之硬體架構 圖。 圖2係本發明萬用表校驗方法較佳實施例之作業流程 圖。 圖3係電腦獲取圖片中數值的較佳實施例之流程圖。 圖4係圖3中步驟S300攝像頭所拍攝的第一張圖片。 圖5係圖3中步驟S304攝像頭所拍攝的第二張圖片。 圖6係圖3中步驟S306利用差影法所獲得的新圖片 的示意圖。 圖7係圖3中S308獲取新圖片中八段碼字元的Μ段 的頂點座標之示意圖。 圖8係真值表示意圖。 【主要元件符號說明】 萬用表 1 校準源 2 測量控制箱 3 電腦 4 攝像頭 5 11 201017200 機械手臂 6 * 機械手臂將萬用表的檔位調整到所要校驗的檔位 . S20 測量控制箱根據所要校驗的檔位閉合相應的開關 S22 校準源發送一個類比訊號給萬用表 S24 萬用表將類比訊號轉化為數位訊號，並顯示該數位訊 號表達的數值 S26 ® 攝像頭拍攝萬用表顯示的數值 S28 電腦獲取所拍攝圖片中的數值 S30 所述數值的平均值是否在所述萬用表的允許誤差範 圍内？ S32 提示該萬用表有誤差 S34 萬用表需要校驗的檔位是否都已經校驗完畢？ S36 生成校驗報告 S38 12201017200 IX. Description of the invention: [Technical field to which the invention pertains] In particular, the invention relates to a calibration system and method, a table verification system and a method. [Prior Art] 掌上 The handheld multimeter has been widely used, and the accuracy of the lack of accuracy is also increasing. Therefore, the accuracy of the multimeter has become an important issue. %C verification = before, because Wansi has no external interface, the school of Wansi will manually input the value displayed by the multimeter, and when the multimeter is not verified, it needs to be manually _ change the line. After all the checkpoint verification elements are completed, it is necessary to manually record the data and make a verification report, which wastes a lot of manpower and reduces the work efficiency. SUMMARY OF THE INVENTION The above content 'necessary to provide a multimeter calibration system and method' can effectively verify the multimeter. - a universal wire calibration system 'includes a calibration source and a computer connected to the calibration source. The calibration source is connected to a multimeter to be verified. The computer is connected with a camera and a robot arm for adjusting the multimeter. The calibration gear is used to output an analog signal to the multimeter according to the adjusted gear position; the multimeter is used to convert the digital signal into a digital signal and display the value expressed by the digital signal; the camera is used for shooting The value displayed by the multimeter obtains a picture; and the computer is used to obtain the value in the captured picture, and determine whether the average value of the value in the captured picture is within the allowable error range of the 201017200 • multimeter, and according to the judgment result Generate a check report " report. A multimeter calibration method, the method comprising the steps of: adjusting a multimeter to a gear position to be verified; the calibration source outputs an analog signal to the multimeter according to the adjusted gear position; the multimeter converts the analog signal into a digital signal and displays The value expressed by the digital signal; capture the value displayed by the multimeter; obtain the value in the captured picture; determine whether the average value of the values in all the captured pictures is within the allowable error range of the multimeter; and generate according to the above judgment result Verification report. Compared with the prior art, the multimeter calibration system and method can control the multimeter calibration process by the whole computer, thereby improving work efficiency and saving working time. [Embodiment] As shown in Fig. 1, it is a hardware architecture diagram of a preferred embodiment of the multimeter calibration system of the present invention. The system includes: multimeter 1, calibration source 2, measurement control φ box 3, computer 4, camera 5 and robot arm 6. Both the multimeter 1 and the calibration source 2 comprise a plurality of gear positions, such as an AC voltage gear. Wherein, the gear position of the multimeter 1 and the gear position of the calibration source 2 correspond to each other, and the corresponding gear position is connected through a switch of the measurement control box 3, for example, the AC voltage file of the multimeter 1 transmits through one of the measurement control boxes 3 The switch is connected to the AC voltage file of calibration source 2. The calibration source 2 and the measurement control box 3 are respectively connected to the computer 4 through a serial port, such as an RS232 serial port. When the measurement control box 3 is turned on and off, the measurement control box 3 sends a signal to the computer 4 to notify the 6 201017200 that the switch of the computer 4 is closed. After receiving the signal, the computer 4 sends a command to the calibration source 2, so that the calibration source 2 sends an analog signal to the multimeter ί. The analog signal in this embodiment may be a voltage signal or a current signal. The multimeter is adapted to convert the analog signal into a digital signal and display the value represented by the digital signal. In the present embodiment, the camera 5 can be connected to the computer 4' via the usb interface or built into the computer 4. The camera φ Φ the numerical value displayed by the multimeter 1, specifically, the camera 5 is photographed once every time t'. In the preferred fourth, the image taken for the camera 5 is shown in Fig. 2 = brain, ϋ According to the shackles, the light knife prayed to a verification test to generate a verification report. In addition, 兮 雷脑 4 through a series of 埠 and machinery 4 f6 adjust the multimeter! The slot. Having it used to control the robot operation ^ is the check 6 of the preferred embodiment of the multimeter calibration method of the present invention, and the configuration of the multimeter 1 is adjusted to the desired step 1 22 'measurement control box 3 according to the required verification The corresponding opening of the slot is closed, for example, in the step S20, if the robot arm 6 will be 10,000: the weight of the table 1 is adjusted to the AC voltage, then the measurement control box 3 is closed to connect the multimeter 2 3 = the source of the calibration source 2 _ of the money slot. After the nickname is given to the multimeter, the calibration source 2 sends a class ^ § 4 . In this embodiment, the analog signal can be an electrical or current signal. For example, if the switch of the measurement control 7 201017200 box 3 connected to the AC voltage file is closed in step S22, the analog signal is a voltage signal. Step S26, after receiving the analog signal, the multimeter i converts the analog signal into a digital signal and displays the value represented by the digital signal. Step S28' The camera 5 captures the value displayed by the multimeter m. In this embodiment, the camera 5 takes a picture of the multimeter shown in the multi-meter ί every 35,200 ms, and takes a total of ten times. In step S30, the computer 4 acquires the value of the captured picture_. (4) S32 ' The computer 4 judges whether or not the average value of the numerical value is in the allowable miswire axis of the multimeter 1. If the average value is not within the allowable error range of the multimeter 1, the multimeter 1 is prompted to be in error in the half step S34, that is, the check result is the multimeter 1 and then proceeds to step S38. Here, the average value refers to a value obtained by dividing the numerical values of all the pictures taken by the camera 5 by the number of pictures. For example, if a total of 10 pictures are taken by the camera 5, the average value is equal to the sum of the values displayed by the 10 pictures divided by the step S36, when the Xinyi ten mean value is within the allowable error range of the multimeter 1. The verification company | If the multimeter 1 passes the verification, the computer 4 determines whether the gears that need to be verified by the multimeter 1 have been verified. If there is a check in the multimeter 1 that requires the verification of the goods, the process goes to step S20. If the multimeter 1 has been verified to have been verified, the process proceeds to step S38. Step S38 'Computer 4 Pepper (5) H generates a verification report based on the verification result. 8 201017200 ' As shown in FIG. 3, a flow chart of a preferred embodiment of the computer 4 to obtain values in a picture. Step S300' The camera 5 captures the numerical value currently displayed by the multimeter as the first picture. As shown in Fig. 4, the first picture shows 0.2 ′, that is, the value displayed by the multimeter 1 is 0.2. In step S302, the calibration source 2 re-outputs another analog signal to the multimeter i according to the command sent by the computer 4, and the multimeter converts the analog signal into a digital signal and displays the value expressed by the digital signal. Step S304' The camera 5 photographs the private table 1 private one. 1 The rain claws J are displayed in the value shown in step S302 to obtain a second picture. As shown in Fig. 5, the first picture shows 8.21 ’, that is, the value displayed by the multimeter 1 is 8. Step S306' The computer 4 obtains a new picture ° by the difference method. The subtraction method refers to subtracting the image displayed by the first picture from the second picture, and the resulting image is the new picture. For example, the image displayed by the two pictures in FIG. 5 and FIG. 4 is subtracted to obtain a new picture shown in FIG. © In this embodiment, whether it is the first picture, the second picture, or a new picture, the characters constituting each value are composed of eight segments, that is, eight-segment characters. ... Step S308, the computer 4 acquires the vertex coordinates of the segments constituting each of the eight-segment Ma characters in the new picture. As shown in FIG. 7, the eight-segment code character 8 is displayed in the new picture. In this embodiment, the vertex coordinates of the μ segment in the eight-segment code character 8 are taken as an example for description, if the upper left corner of the new picture is used. The point is the plane coordinate system of the origin, and the four vertex coordinates of the rectangle ABCD that make up the segment are: A ( xl, y2), B ( x2, y2 ) ' C ( xl, yl), d ( χ 2, yl ). 9 201017200 Step S310' uses the obtained vertex coordinates to find the position corresponding to each segment in the eight-segment code character on the first picture and the second picture. For example, the first description in FIG. The position corresponding to the μ segment is found in the two pictures. Step S312' calculates the average luminance Fi of all the primitive points constituting each segment in the eight-segment code character. For example, if the segment of the eight-segment code character is represented by i, the value is 1 to 8'. The first segment, i=i, then F1 represents the average brightness of all the primitive points in the M segment. The step S314' calculates the luminance average value Fr of the reference area. This reference area refers to the area in the picture from which all eight-segment code characters are removed. In step S316, it is determined whether |Fi_Fr| is greater than a threshold. The threshold can be set by itself. The threshold is 125 steps in the preferred embodiment. When the |Fi-Fr| is greater than the threshold, the process proceeds to step S318; when |Fi-Fr丨 is not greater than the threshold, the process proceeds to step S320. In step S318, it is determined that the state of the segment is a bright state. For example, F1 is the average brightness of the segment of the Μ ® segment. When |F1-Fr| is greater than the threshold, the segment is confirmed to be free. In step S320, it is determined that the state of the segment is a dark state. In step S322, the values in the respective pictures are obtained by using the truth table according to the light and dark state of each segment, and the truth table is as shown in FIG. The pictures include a first picture and a second picture. In the present embodiment, "1" shown in FIG. 8 represents a bright state, and it is necessary to indicate that the number of 201017200 values in the two pictures taken in the above steps is in the new picture obtained by the difference method. At least one character must be 8' to accurately locate the parent eight-segment codeword. The above is only the preferred embodiment of the present invention, and has been used in a wide range of applications. Any other equivalent changes or modifications which are not departing from the spirit of the present invention should be included in the following claims. Inside. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a hardware architecture diagram of a preferred embodiment of the multimeter calibration system of the present invention. Fig. 2 is a flow chart showing the operation of the preferred embodiment of the multimeter calibration method of the present invention. Figure 3 is a flow diagram of a preferred embodiment of a computer to obtain values in a picture. FIG. 4 is the first picture taken by the camera in step S300 of FIG. 3. FIG. 5 is a second picture taken by the camera in step S304 of FIG. 3. Figure 6 is a schematic diagram of a new picture obtained by the subtractive method in step S306 of Figure 3. FIG. 7 is a schematic diagram of the vertices of the Μ segment of the eight-segment code character in the new picture taken by S308 in FIG. 3. Figure 8 is a schematic diagram of the truth table. [Main component symbol description] Multimeter 1 Calibration source 2 Measurement control box 3 Computer 4 Camera 5 11 201017200 Robot arm 6 * The robot arm adjusts the multimeter's gear position to the gear to be verified. The S20 measurement control box is verified according to the The gear closes the corresponding switch S22. The calibration source sends an analog signal to the multimeter S24. The multimeter converts the analog signal into a digital signal and displays the value represented by the digital signal. S26 ® The camera displays the value displayed by the multimeter. S28 The computer obtains the value in the captured picture. Is the average value of the values stated in S30 within the allowable error range of the multimeter? S32 prompts that the multimeter has an error. Does the S34 multimeter need to verify that the gears have been verified? S36 Generate verification report S38 12