200945816 九、發明說明： 【發明所屬之技術領域】 本發明係與數位寬頻訊號之雜訊量測有關，特別是指 數位訊號傳輸於低頻範圍之雜訊量測方式及其所應用之量 測裝置。 - 5 【先前技術】 〇 在網路通訊技術中，為了增加網路用戶之頻寬及網路 多向傳輸之多工技術，單一傳輸線往往兼具多頻分工與雙 ： 向傳輸的功能，以有線電視網路之發展為例，初期當系統 1 1〇業者為了服務廣大區域的收視用戶，自系統頭端延伸至用 戶端之幹線及分配網路上便設置有多數個訊號放大裝置， 以維持遠距離接收用戶具有等同於近距離之收訊品質，再 隨著寬頻交換技術的發展與雙向網路傳輸的技術需求，原 先有線電視網路上所裝設之訊號放大裝置則對應更新為雙 ❹ 向放大器，使有線電視同樣能以單一傳輸線兼具雙向數位 通訊的網路傳輸功能。 . 凊參閱如第一圖所示為一般有線電視網路所使用之雙 向放大器模組1 ’基於電路整體的規格完整性，放大器之電 路結構係由產品供應商整合於單一模組裝置内，僅於背板 2〇 10提供可外接之多個通訊埠u以接設特定訊號傳輸規格的 傳輸線配件，或外露有導通至電路内部之元件插座12可供 系統業者進行維修、調校等測試工程，當中各通訊埠U包 括有連接至系統頭端之一頭端連接槔110以及連接至各用 戶端之多數個終端連接埠u卜112、113，使接收自系統頭 4 200945816 端之有線電視訊號可透過各終端連接埠1U、112、U3八 至多數個用戶端，當特定用戶端取得網路雙向通 授權後，該雙向放大器模組1即可使該用戶端透過與對應 終端連接埠111、112、113電性連接之各單一傳輸線上傳 .5及下載數位1K號；該些元件插座12除了可用以插設被動元 件12i以調校訊號特性，更有多個設於周邊之測試接點122 肖以接設職儀器’使該雙向放A||餘丨可於測試接點 122連接測試顧後’因應不同之網路_環境而微調特定 對應之被動元件121以維持其訊號傳輸品質。 10 第二圖所示即為該對雙向放大器模組1進行檢測工程 所使用之-測試轉接頭2，其中一端之探測頭21用以插入 該測試接點122 ’另-端之傳輸頭22用以接設訊號缓線供 電性連接測試儀器，當探測頭21插人測試接點122後，藉 由旋接部23將探測頭21更旋進該測試接點122，才使傳輸 15頭22達到電性連接該雙向放大器模組^之内部電路，如此 之電_試方式僅域由探卿21深人雙向放大器模組！ 心卩以電性連接電路之待測節點，-旦在長時間使用造成 探測頭21之磨損後，則容易發生電性接觸不良之現象，造 成量測工程之困難與測試可靠度之問題。 20 $配合如第二圖所示該雙向放大器模組1内部電路震 ^13之不意圖’當中各輸入、輸出節點140、141、142、 I、對 1應為電性連接該背板1〇之頭端、終端連接埠11〇、 之測二=，各:Γ夂㈣ 2由於各測試節點15於電路環境中即對應 5 200945816 為相鄰各輸入、輸出節點140、141、142、143之同一導通 路徑，在測試、調校該雙向放大器模組1時，一旦測試儀 器的訊號缓線電性連接各測試接點122,即改變原本網路傳 輸訊號之特性阻抗，僅能自各測試節點15讀取最佳之訊號 5特性，進而形同取代各輸入、輸出節點14〇、141、142、143 之網路連線’造成測試過程用戶端的網路傳輸中斷現象。200945816 IX. Description of the Invention: [Technical Field] The present invention relates to noise measurement of digital broadband signals, in particular, a noise measurement method in which an exponential bit signal is transmitted in a low frequency range, and a measurement device to which the same is applied . - 5 [Prior Art] In the network communication technology, in order to increase the bandwidth of network users and the multiplex technology of network multi-directional transmission, a single transmission line often has multiple frequency division and dual: transmission function, For example, in the development of cable TV networks, in the early days, in order to serve the users of the vast area, the system 1 1 has been installed with a number of signal amplification devices from the head end of the system to the trunk and distribution network of the user terminal to maintain the far distance. The receiving user has the same close-range receiving quality, and with the development of broadband switching technology and the technical requirements of two-way network transmission, the signal amplifying device installed on the original cable television network is updated to be a dual-turn amplifier. So that cable TV can also have the network transmission function of two-way digital communication with a single transmission line.凊 Refer to the two-way amplifier module 1 used in the general cable television network as shown in the first figure. Based on the overall integrity of the circuit, the circuit structure of the amplifier is integrated into the single module device by the product supplier. The backplane 2〇10 provides a plurality of external communication ports for connecting transmission line accessories of a specific signal transmission specification, or a component socket 12 which is electrically connected to the inside of the circuit for maintenance and adjustment of the system for the system, Each communication port U includes a head end port 110 connected to the head end of the system and a plurality of terminal ports 112, 113 connected to each user terminal, so that the cable television signal received from the system head 4 200945816 end is transparent. Each terminal is connected to 埠1U, 112, and U3 to a plurality of user terminals. After the specific user terminal obtains the network bidirectional communication authorization, the bidirectional amplifier module 1 can connect the user terminal to the corresponding terminal, 111, 112, 113 single connection lines for electrical connection upload .5 and download digits 1K; these component sockets 12 can be used to interpolate the passive components 12i to adjust the signal characteristics, and more A test pole located at the periphery of the bridge 122 to connect the equipment to enable the two-way A||Ember can be connected to the test contact 122 after the test, in response to different network_environment and fine-tuning the specific corresponding passive components 121 to maintain its signal transmission quality. 10 The second figure shows the test adapter 2 used for the detection of the bidirectional amplifier module 1 , wherein the probe 21 at one end is used to insert the test head 122 'the other end of the transmission head 22 The signal is connected to the test device 122. After the probe 21 is inserted into the test contact 122, the probe 21 is further screwed into the test contact 122 by the screwing portion 23, so that the transfer head 15 is enabled. The electrical circuit is connected to the internal circuit of the bi-directional amplifier module, so that the electric test mode is only used by the Shen 21 deep human bidirectional amplifier module! The heart is electrically connected to the node to be tested, and the wear of the probe 21 after prolonged use is prone to electrical contact failure, which causes problems in measurement engineering and reliability of the test. 20$ cooperates with the internal circuit of the bidirectional amplifier module 1 as shown in the second figure. The input and output nodes 140, 141, 142, I, and 1 should be electrically connected to the backplane. The head end, the terminal connection 埠11〇, the measurement two=, each: Γ夂(4) 2 Since each test node 15 corresponds to 5 in the circuit environment, 200945816 is the adjacent input and output nodes 140, 141, 142, 143 The same conduction path, when testing and calibrating the bidirectional amplifier module 1, once the signal of the test instrument is electrically connected to each test contact 122, the characteristic impedance of the original network transmission signal is changed, and only the test nodes 15 can be used. Reading the best signal 5 characteristics, which in turn replaces the network connections of the input and output nodes 14〇, 141, 142, 143, causes the network transmission interruption of the test process user.
再者，與輸入節點140電性連接之頻率雙工器160用 以將頭端連接埠110所接收之訊號處理為特定頻寬範圍之 下行訊號，經過等化、放大等訊號品質處理後，分歧至各 10輸出節點141、142、143由對應之終端連接埠ui、η]、 15 送出供使用戶接收；與各輸出節點141、142、143電性 連接之頻率雙工器161、162、163用以將使用者所上傳至 對應終端連料1U、112、113之訊號處理為特定頻寬範 圍之上行訊號，各上行傳輸路徑藉由結合電路再以放大、 等化處理後-致由與該輸人節點14()相接之頭端連接淳， 送回系統端；然而，由於各測試節點15為頻率雙工器16〇、 161 162、163在處理上、下行訊號前之電路節點，亦即位 於該雙向放大H模組丨之實際上、下行駭峨之電路處 τά卜、因v此任該測試節點15所顯示之訊號特性為混和 敗域範圍的諸多訊號疊加結果’ n统業者在測試網 外二=帶封包之載波訊號受到其餘 之訊浦結果’無法區特定上、下行頻寬範圍 而難以爭丨^ ^牛，造成封包接收測試上的誤碼率提升，因 川试为析實際網路環境或電路環境之影響因素。 6 20 200945816 【發明内容】 因此’本發明之主要目的乃在於提供一種數位訊號之 雜訊量測裝置，可應用於寬頻傳輸網路中，量測自用戶端 5上傳至頭端之數位訊號所夾帶之雜訊並可維持數位訊號於 網路之傳輸不中斷。 。 '、 ^ 為達成前揭目的，本發明所提供之一種雜訊量測裝 置，係設置有一電路板及與該電路板電性連接之一測試衰 減器及一測試接頭，該電路板之輸入端用以接收寬頻傳輸 10網路之數位傳輸訊號，將訊號分歧至二傳輸線路，其中經 由第一傳輸線路以及該測試接頭使訊號傳輸至訊號分析儀 器，由第二傳輸線路及該測試衰減器使訊號回傳至有線電 視網路，由於訊號自該電路板輸入端所輸入之特性阻抗與 該二傳輸線路之並聯等效特性阻抗相匹配，且該測試衰減 I5 11將第二傳輸線路所接收之訊轉換成與網路傳輸之訊號 特性阻抗相匹配，因此可同時由訊號分析儀器有效接收量 測並於原傳輸網路維持原訊號之傳輸特性。 本發明之另一目的乃在於提供應用上述該雜訊量測裝 置之一種雜訊量測方法，用於量測傳輸網路之雙向放大 2〇器，將雙向放大器中經低通濾波處理訊號後之訊號傳輸路 徑所經之一衰減器拔除，另以該雜訊量測裝置取代，使該 低頻帶訊號可藉由通過該雜訊量測裝置而維持於該雙向放 大器中傳輸之訊號特性，並使上述低頻帶訊號可經由該第 一傳輸線路輸入訊號分析儀器，一旦設定該訊號分析儀器 7 200945816 於3低頻▼訊號之頻寬範圍進行頻譜分析即可測得上述 低頻帶訊號之載波特性及其所夾警之雜訊。 【實施方式】 5 以下，茲配合若干圖式列舉一較佳實施例，用以對本 發明之組成構件及功效作進一步說明，其中所用各圖式之 簡要說明如下： 第二圖係為本發明最較佳實施例所提供雜訊量測裝置 用以量測之雙向放大器之電路裝置示意圖； 10 帛四圖係為上述最較佳實關所提供雜訊量測裝置之 立體示意圖； 第五圖係為上述最較佳實施例所提供雜訊量測裝置之 側視圖； 第六圖係為上述最較佳實施例所提供雜訊量測裝置之 15電路板之分解立體示意圖。 明參閱如第四及第五圖所示，為本發明最較佳實施例 所提供一雜訊量測裝置3,用以接設如第-及第三圖所示有 線，視網路中之雙向放大器1，可供訊號分析儀器透過該雜 訊量測裝置3量測自用戶端上傳至頭端之數位訊號所夹帶 2〇之雜訊並可維持數位訊號於有線電視網路之傳輸不中斷， 該雜訊量測裝置3係設置有-電路板30及與該電路板30 電性連接之一測試衰減器40及-測試接頭50，其中： 請參閱如第六圖所示，該電路板30係由多層印刷電路 板所製成’具有一輪入端3〇1、一第---第二輸出端302、 8 200945816 303及一接地端304 ’並設有一轉接線路η、第一、一第二 傳輸線路32、33、一輸出線路34、一接地電路35及縱: ，性導通之一元件端組36,該轉接線路31為作為訊號分歧 器之功用，用以將該輸入端301之電性傳輸轉換為二傳輸 • 5路徑，使該二傳輸線路32、33可同時傳送自該輸入端3〇1 所接收之訊號並維持阻抗匹配特性，該第一傳輸線路32設 〇 於該多層印刷電路板之上層板3〇a，一端透過該轉接線路 31電性連接該輸入端301且另一端電性連接該第一輸出端 302 ’該第二傳輸線路33於該多層印刷電路板之下層板3〇b ίο電性連接該元件端組36之輸入節點361，且縱向導通至該 上層板30a透過該轉接線路31電性連接該輸入端3〇1，該 輸出線路34設於該上層板30a且兩端分別電性連接該元件 端組36之輸出節點362及該第二輸出端303，該接地電路 35緊鄰於該些第一、第二傳輸線路32、33及輸出線路34 I5與之相鄰特定間距，且電性連接該接地端304及該元件端 ® 組36之接地節點363。 配合第四及第六圖參照’該測試衰減器40為具有三個 電性腳位之可插拔式被動元件，電性連接該元件端組36之 各節點361、362、363 ’相對設於該輸入、輸出節點361、 2〇 362之輸入、輸出腳位之間具有特定之直流電阻值，係配合 該電路板30之電路佈設以及實際所傳輸訊號之特性而設計 其内部電路結構，使訊號經該測試衰減器40時造成適當之 功率衰減量，並使經由該測試衰減器40輸出之訊號特性阻 抗相當於自該電路板30輸入端301輸入之特性阻抗。 9 200945816 該測試接頭50係為同軸訊號傳輸結構用以接設上述訊 號分析儀器，具有一軸心金屬51電性連接該第一輸出端 302，以及環繞於該轴心金屬51周圍之一接地環52電性連 接該接地電路35。 .5 由於在使用者上傳網路數位訊號時，如第三圖所示之 該雙向放大器1中與任一終端連接埠141、142、143電性 ❹ 連接之頻率雙工器161、162、163將數位載波訊號經低通 濾波處理成具有特定頻寬範圍之低頻帶訊號，對後級電路 而言，傳輸訊號除了低通濾波處理後之載波訊號，亦可能 1〇存在有伴隨原上傳訊號之基本載波同時傳遞之低頻雜訊， 或者於後級電路環境因素干擾導致之電磁干擾，一旦與多 路訊號結合甚至與基本載波訊號同時經等化濾波之放大處 理’往往容易使頭端連接埠14〇接收到受雜訊干擾後之上 傳訊號’造成實際上傳訊號之失真且訊號解調後誤碼之現 Q 15象；因此系統業者為了維持傳輸網路的品質，常需監測系 統網路以過濾系統中的電路干擾因素，當配合以本發明所 提供之該雜訊量測裝置3檢測如第三圖所示之該雙向放大 器1時’則可讀取上傳訊號頻寬範圍之載波特性，再藉由 將相關訊號品質之元件特性微調以排除或補償如上述之電 2〇路環境干擾，其中檢測方式為： 於任一終端連接埠141、142、143之上傳路徑中，將 頻率雙工器161、162、163低通處理後之傳輸路徑所經之 一衰減器拔除’另以該雜訊量測裝置3取代’使該低頻帶 訊號可藉由通過該雜訊量測裝置3之輸入端301至第二輸 200945816 出端302而維持於該雙向放大器丨中傳輸之訊號特性，並 使上述低頻帶訊號可經由該第一傳輸線路32輸入一訊號分 =儀器，一旦設定該訊號分析儀器於該低頻帶訊號之頻寬 範圍進行頻譜分析，即可測得上述低頻帶訊號之載波特性 5及其所夾帶之雜訊。 綜合上述之特性可知，該雜訊量測裝置3係以該電路 ❹ 板30之輸入端301接收有線電視網路之數位傳輸訊號，經 該轉接線路31將訊號分歧後，由該第一傳輸線路32以及 該測試接頭50使訊號傳輸至訊號分析儀器，並由該第二傳 1〇輸線路33、測試衰減器40以及該輸出線路34使訊號回傳 至有線電視網路，當中藉由該第一傳輸線路32與該測試接 頭50之設計即可使訊號傳輸至訊號分析儀器後具有相當於 通過原衰減器之訊號特性，同理，藉由該第二傳輸線路、 測试衰減器40及輸出線路34之設計使訊號傳輸至第二輸 Q 15出端302後具有相當於通過原衰減器之訊號特性，再者， 由於訊號自該輸入端301輸入至轉接線路31之輸入特性阻 抗與該二傳輸線路32、33之並聯等效特性阻抗相匹配，且 該測試衰減ϋ 40冑第二傳輸線路33戶斤接收之訊號轉換至 該輸出線路34與有線電視網路傳輸之訊號特性阻抗相匹 2〇配，因此可同時由訊號分析儀器有效接收量測並於有線電 視網路維持原訊號傳輸之特性。 、 唯，以上所述者，僅為本發明之較佳可行實施例而已， 故舉凡應用本發明說明書及申請專利範圍所為之等效結構 變化，理應包含在本發明之專利範圍内。 … 200945816 【圖式簡單說明】 第一圖係為一般有線電視網路之雙向放大器模組之後 視圖； 第二圖係為習用檢測上述雙向放大器模組之測試轉接 5 頭；Furthermore, the frequency duplexer 160 electrically connected to the input node 140 is configured to process the signal received by the head end port 110 into a signal signal below a specific bandwidth range, and after the equalization and amplification, etc., the signal quality is processed. Each of the 10 output nodes 141, 142, and 143 is sent by the corresponding terminal connection 埠ui, η], 15 for the user to receive; and the frequency duplexers 161, 162, 163 electrically connected to the respective output nodes 141, 142, 143. The signal used by the user to upload the corresponding terminal 1U, 112, 113 is processed into an uplink signal of a specific bandwidth range, and each uplink transmission path is amplified and equalized by the combining circuit. The input node 14() is connected to the head end and sent back to the system end; however, since each test node 15 is a frequency duplexer 16〇, 161 162, 163 is processing the circuit node before and after the downlink signal, That is, the circuit is located in the actual, downstream circuit of the two-way amplification H-module, and the signal characteristic displayed by the test node 15 is a result of a plurality of signal superpositions of the mixed domain. Test network outside 2 = belt The carrier signal of the packet is affected by the rest of the signal. It is difficult to contend for the specific uplink and downlink bandwidth range. ^^牛, resulting in an increase in the bit error rate on the packet receiving test, because the Sichuan test is to analyze the actual network environment or circuit. Environmental impact factors. 6 20 200945816 SUMMARY OF THE INVENTION Therefore, the main purpose of the present invention is to provide a digital signal measurement device for digital signals, which can be applied to a broadband transmission network, and measures digital signals transmitted from the user terminal 5 to the head end. Entrained noise and maintains the transmission of digital signals over the network without interruption. . For the purpose of achieving the foregoing, a noise measuring device provided by the present invention is provided with a circuit board and a test attenuator and a test connector electrically connected to the circuit board, and the input end of the circuit board The digital transmission signal for receiving the broadband transmission 10 network diverges the signal to the second transmission line, wherein the signal is transmitted to the signal analysis instrument via the first transmission line and the test connector, and is made by the second transmission line and the test attenuator The signal is transmitted back to the cable television network, because the characteristic impedance input from the input of the circuit board matches the parallel characteristic impedance of the two transmission lines, and the test attenuation I5 11 is received by the second transmission line. The signal is converted to match the signal characteristic impedance of the network transmission, so that the signal analysis instrument can effectively receive the measurement and maintain the transmission characteristics of the original signal in the original transmission network. Another object of the present invention is to provide a noise measurement method using the above-described noise measuring device, which is used for measuring a bidirectional amplification device of a transmission network, and after low-pass filtering processing the signal in the bidirectional amplifier The signal transmission path is removed by one of the attenuators, and replaced by the noise measuring device, so that the low frequency band signal can maintain the signal characteristic transmitted in the bidirectional amplifier through the noise measuring device, and The low frequency band signal can be input to the signal analysis instrument via the first transmission line, and the carrier characteristic of the low frequency band signal and the frequency characteristic of the low frequency band signal can be measured once the signal analysis instrument 7 200945816 is set to perform spectrum analysis on the bandwidth range of the 3 low frequency ▼ signal The noise of the police. [Embodiment] 5 Hereinafter, a preferred embodiment will be described with reference to a plurality of drawings for further explaining the components and functions of the present invention. The brief description of each of the drawings is as follows: A schematic diagram of a circuit device for measuring a bidirectional amplifier provided by a noise measuring device according to a preferred embodiment; 10 is a three-dimensional schematic diagram of a noise measuring device provided by the above-mentioned best practice; A side view of the noise measuring device provided in the above preferred embodiment; the sixth drawing is an exploded perspective view of the 15 circuit board of the noise measuring device provided in the above preferred embodiment. As shown in the fourth and fifth figures, a noise measuring device 3 is provided for the most preferred embodiment of the present invention for connection to a wired network as shown in the first and third figures. The bidirectional amplifier 1 can be used by the signal analysis device to measure the noise of the digital signal carried by the digital signal uploaded from the user terminal to the head end and can maintain the transmission of the digital signal on the cable television network. The noise measuring device 3 is provided with a circuit board 30 and a test attenuator 40 and a test connector 50 electrically connected to the circuit board 30, wherein: the circuit is as shown in FIG. The board 30 is made of a multilayer printed circuit board having a wheel-in terminal 3〇1, a first--second output terminal 302, 8 200945816 303 and a grounding terminal 304' and is provided with a switching line η, first a second transmission line 32, 33, an output line 34, a grounding circuit 35 and a vertical: one of the component end groups 36, the switching line 31 functions as a signal splitter for the input The electrical transmission of the terminal 301 is converted into a two-transmission path, so that the two transmission lines 32 and 33 can be simultaneously transmitted. The first transmission line 32 is disposed on the upper layer 3a of the multi-layer printed circuit board, and the one end is electrically connected to the input through the transmission line 31. The signal received from the input terminal 3〇1 maintains the impedance matching characteristic. The second terminal 301 is electrically connected to the first output end 302. The second transmission line 33 is electrically connected to the input node 361 of the component end group 36 under the multilayer printed circuit board, and is vertically connected. The upper layer 30a is electrically connected to the input terminal 3〇1 through the adapter line 31. The output line 34 is disposed on the upper layer 30a and electrically connected to the output node 362 of the component end group 36 and the first end respectively. The two output terminals 303 are adjacent to the first and second transmission lines 32 and 33 and the output line 34 I5 adjacent to the specific spacing, and are electrically connected to the ground terminal 304 and the component end group 36. Ground node 363. Referring to the fourth and sixth figures, the test attenuator 40 is a pluggable passive component having three electrical pins, and the nodes 361, 362, and 363 of the component end group 36 are electrically connected to each other. The input and output nodes 361, 2 362 have a specific DC resistance value between the input and output pins, and the internal circuit structure is designed to match the circuit layout of the circuit board 30 and the characteristics of the actual transmitted signal. The appropriate amount of power attenuation is caused by the test attenuator 40, and the signal characteristic impedance outputted through the test attenuator 40 corresponds to the characteristic impedance input from the input terminal 301 of the circuit board 30. 9 200945816 The test connector 50 is a coaxial signal transmission structure for connecting the signal analysis instrument, and has a shaft metal 51 electrically connected to the first output end 302, and a grounding ring surrounding the axis metal 51 52 is electrically connected to the ground circuit 35. .5 Since the user uploads the network digital signal, as shown in the third figure, the frequency duplexer 161, 162, 163 of the bidirectional amplifier 1 connected to any of the terminals 141, 142, 143 is electrically connected. The digital carrier signal is low-pass filtered into a low-band signal having a specific bandwidth range. For the latter circuit, the carrier signal except the low-pass filtering process of the transmission signal may also be accompanied by the original upload signal. The low-frequency noise transmitted by the basic carrier at the same time, or the electromagnetic interference caused by the interference of the environmental factors of the latter stage circuit, once combined with the multi-channel signal or even the equalization of the basic carrier signal, the amplification process is often easy to make the head end connection 埠14上传 After receiving the noise interference, the upload signal 'has the distortion of the actual upload signal and the error after the signal is demodulated. Therefore, in order to maintain the quality of the transmission network, the system operator often needs to monitor the system network to filter The circuit interference factor in the system is readable when the noise measuring device 3 provided by the present invention detects the bidirectional amplifier 1 as shown in the third figure. Uploading the carrier characteristics of the signal bandwidth range, and then fine-tuning the component characteristics of the relevant signal quality to eliminate or compensate for the electrical environment interference as described above, wherein the detection mode is: 任一141, 142, 143 connected to any terminal In the upload path, one of the attenuators of the low-pass processing channel of the frequency duplexer 161, 162, 163 is removed and replaced by the noise measuring device 3 to enable the low-band signal to pass through The input end 301 of the noise measuring device 3 is connected to the output end 302 of the second input 200945816 to maintain the signal characteristic transmitted in the bidirectional amplifier ,, and the low frequency band signal can input a signal segment via the first transmission line 32. = Instrument, once the signal analysis instrument is set to perform spectrum analysis on the bandwidth of the low-band signal, the carrier characteristic 5 of the low-band signal and its entrained noise can be measured. In combination with the above characteristics, the noise measuring device 3 receives the digital transmission signal of the cable television network through the input terminal 301 of the circuit board 30, and after the signal is diverged via the switching line 31, the first transmission line The circuit 32 and the test connector 50 transmit signals to the signal analysis instrument, and the second transmission line 33, the test attenuator 40, and the output line 34 cause the signal to be transmitted back to the cable television network. The design of the first transmission line 32 and the test connector 50 enables the signal to be transmitted to the signal analysis instrument to have a signal characteristic equivalent to passing through the original attenuator. Similarly, the second transmission line, the test attenuator 40 and The output line 34 is designed to transmit a signal to the output terminal 302 of the second input Q 15 having a signal characteristic equivalent to passing through the original attenuator, and further, due to the input characteristic impedance of the signal input from the input terminal 301 to the transfer line 31 The parallel equivalent characteristic impedances of the two transmission lines 32, 33 are matched, and the test attenuation ϋ 40 胄 the second transmission line 33 receives the signal received by the user to the output line 34 and the cable television network transmission The characteristic impedance of the signal matches with 2〇, thus can receive signals from the analysis equipment and maintaining an effective measurement of the characteristics of the original signal transmission in cable television network. The above is only the preferred embodiment of the present invention, and the equivalent structural changes of the present invention and the scope of the patent application are intended to be included in the scope of the present invention. ... 200945816 [Simple diagram of the diagram] The first diagram is the rear view of the bidirectional amplifier module of the general cable television network; the second diagram is the test adapter for the detection of the above bidirectional amplifier module;
，三圖係為本發明最較佳實施例所提供雜訊量測裝置 用以量測之雙向放大器之電路裝置示意圖； 立體2隱為上述最触實施綱提供雜訊量測裝置之 侧視^五圖係為上述最較佳實施例所提供雜訊量測裴置之 第六圖係為上述最較佳實施例所提供雜訊 電路板之分解立體示意圖。 重職置之 ❹ 12 200945816 【主要元件符號說明】 1雙向放大器 140頭端連接埠 141、142、143終端連接埠 161、162、163頻率雙工器 5 3雜訊量測裝置 30電路板 30a上層板 30b下層板 301輸入端 302第一輸出端 303第二輸出端 304接地端 31轉接線路 32第一傳輸線路 ίο 33第二傳輸線路 34輸出線路 35接地電路 36元件端組 361輸入節點 362輸出節點 363接地節點 40測試衰減器 50測試接頭 51轴心金屬 15 52接地環 ❹ 133 is a schematic diagram of a circuit device for measuring a bidirectional amplifier provided by a noise measuring device according to a most preferred embodiment of the present invention; 3D 2 is a side view of the above-mentioned most touched implementation providing a noise measuring device. The fifth drawing of the noise measuring device provided in the above preferred embodiment is an exploded perspective view of the noise circuit board provided in the above preferred embodiment. Heavy Duty ❹ 12 200945816 [Main component symbol description] 1 bidirectional amplifier 140 head terminal connection 埠 141, 142, 143 terminal connection 埠 161, 162, 163 frequency duplexer 5 3 noise measurement device 30 circuit board 30a upper layer 30b lower layer board 301 input end 302 first output end 303 second output end 304 ground end 31 transit line 32 first transmission line ίο second transmission line 34 output line 35 ground circuit 36 element end group 361 input node 362 output node 363 Grounding Node 40 Test Attenuator 50 Test Connector 51 Axis Metal 15 52 Grounding Ring ❹ 13